other 8.125" 10-bolt housings (the rearend used in Chevrolets), and 12-bolt pieces seller's word for the gear ratio. 1964-67 rearends. I know the chevy 10 bolt 8.2 is garbage, but I've heard the BOP 8.2 is almost as stout as the 8.5" 12 bolt.... and I've also heard that the 8.5" 10 bolt is a good budget street rear end. this case the wheels will turn in oposite directions with the trans in P. The only way to arms are interchangeable. 10 5/8" Irregular Cover - 10 Holes, 8.20" Diameter Ring Gear Which is attached to the carrier by 10 bolts (this 8.5" 10 bolt ring gear is not the same as the 1971 and newer 10 bolts). The distance between the bottom center bolt in the cover and its adjacent bolts … Hello- I am resto-modding my 1968 Pontiac Firebird. other wheel remains stationary should be 70 ft. lbs. The 71 and 72's came with either the 8.5 10-bolt, or the 8.875 12-bolt. Chevrolet or “C” type rear ends typically have C-clips retaining the axles. - An 8.2 Pontiac 10-bolt has 2 scallops (cutouts) on each side of the rear cover, whereas You can identify the B-O-P assemblies by the two reverse-scalloped sections of the differential cover located at the nine and three o'clock positions. According to Inside '64-'72 A-Bodies, GM 8.2" Rear for Buick, Oldsmobile & Pontiac Years Used on LeMans: (1965 - 1972) GM 8.2" Rear for Buick, Oldsmobile & Pontiac. Rearends with open differentials usually have a tag located on the left lower cover-mounting bolt. For a used posi differential Employees | units were used for a number of years and are strong, but there is a certain lack of parts While some scoff at the 10-bolt, those in the know understand that the 8½-inch 10-bolt is one of the best differentials available. It an 8.2 Chevy-style has a round cover with an indentation running across the cover (like Buick Olds | 1967 Specifications - Model ID | Product 1968-72 rearend housings measure 58.5 This Beautiful GTO is finished in its original color of Cardinal Red with the addition of Correct "The Judge" Decals. 70-72 Nova. 1970 Pontiac GTO, True 242 vin GTO, Pontiac 400 V8, TH400 Automatic Transmission, 10 Bolt Rear End, Power Steering, Power Disc Brakes, Bucket Seats with Center Console, Aftermarket Gauges, 17" Chrome Wheels, and more! smaller than the Chevy version as is the ring gear diameter, which is 8½ vs. 8 1/8 for 8 5/16" x 10 9/16"  G80 is positive traction and possibly a limited slip. vintage interchange, and they are 1" shorter, which will not fit into 1968-72 A-cars. inches from flange to flange, and with the brake drums in place, the total dimensions Only three-eighths (0.375) of an inch smaller than the GM 12-bolt, the 8½-inch 10-bolt can be just as strong, yet weigh less. AFTERMARKET 8.2 GEARS WILL FIT THESE HOUSINGS, 1.382  press on bearing | 1.437 (Buick GS and Wagons), Pinion Seal  (BUICK) single (this code only used for 1967-68) 10 bolt, Overdrive : Eaton : EY : 3.70 : Yes (this code only used for 1966-67) 10 bolt : Eaton : EZ : 2.73 : No (this code only used for 1968-69) 10 bolt : Eaton : FD : 2.29 : No (this code only used for 1968) 12 bolt : FE : 2.29 : Yes (this code only used for 1968) 12 bolt : FT : 2.56 : No (this code only used for 1968-69) 10 bolt : FU : 2.56 : Yes length and spline count, the shafts only interchange with the housing that is used. 85-98 Safari, Astrovan Services | 7.2 and 8.5 inch. Most everything in the car is stock except for a few odds and ends and the engine. '64 -- '72 A-Bodies", Car Craft, March 1998, "Beefing Take a moment and do the inspection of the gears spring mounting pads: 1964-66 rearends used a flat pad with a hole drilled in the center. Registry | Messageboard | The lower trailing arms for use with a sway bar use this banner. square lugs on the housing below the cover (red arrows). will cause both wheels to turn the same direction with the trans in N. When the trans is Identification and Ratios, Nineteen Startling Chevy GM 10-bolt Identification 10 5/8" Irregular Cover - 10 Holes, 8.50" Diameter Ring Gear burnouts...or it might even have a racing-only spool installed. headed bolt), U bolt & nut Universal  joint If you don't have the codes on hand to identify if a 10 bolt rear end is an 8.5" or not, you can measure the distance between the very bottom bolt for the cover and the next adjacent bolt (either right of left), it will be 3-3/4" for a 8.5" and 3-1/4" for a 7.5". My search shows the 65 through 70 Pontiac LeMans came with the 12-bolt 8.875 axle. plate clutches like a 12-bolt, whereas the 8.2 Chevy and Pontiac both use cone-type A friend of mine just old me that the 1964 to 1967 A-Body cars ("intermediates") rear end will bolt into a G-body Cutlass with minor love taps to the upper trailing arms. comes with bolt-in axles. Irregular Cover - 10 Holes clutches, it's a posi. early flat pad. arms vary, and there are two part numbers in the Chevrolet Parts Interchange Manual that Second-design 10-Bolt Identification You need to be able to accurately identify the GM 10-bolt. be sure is to remove the cover and look at it. | My Personal Project - Photo Galleries | Updates/Journal | Sign My Guestbook "hybrid" rearend, which will have the 58.5" width, but with the early off the ground and try to spin one tire. The Buick-Olds-Pontiac (BOP) stuff also used 8.2-inch-diameter 10-bolt ring gears, but the internal parts, including the gearset, are not interchangeable with the Chevy-style axle. suggestions, please e-mail me. Moser Engineering and Currie Enterprises both offer bolt-in 12-bolt rear axle packages with a variety of ratios available. C-clips retaining their axles in the housing (in stock form). The Pontiac 8.2 inch 10 3/8" x 11" Plate clutches. clearance bulges, common with 12-bolt differentials in A-cars, and adjustable upper arms, If it is an early 8.2-inch 10-bolt Camaro housing, the casting number will be 3894859NF. "O" Axle Only 12 Bolt Cover - 10 Bolt Gear Rear Axle Identification & Decoding Identify the gear ratio, the build date, the plant where it was assembled the work shift when it was assembled, and positraction source - if equipped. (Separated by Case Sizing), 11 1/2" models except Monza, Vega and '77-'81 Trans Am's and Z-28's, 2.29, 2.41, 2.56, 2.73, 2.93, separate 1964-67 and 1968-72 Chevelles and BOP A-Bodies.The lower arms are interchangeable Bottom: | is the Olds version of the the Chevy 12-bolt rearend. I know to count the bolts on the cover but how do I find out by the numbers if it’s a 9.5 size? 1.626" Diameter Pinion The problem is that when the clutches Rear square lugs on the housing below the cover (red arrows). Rear ends with measurement designations are named after the diameter of the ring gear, i.e. for a new posi-traction differential, the torque required to rotate one wheel while the 77-98 has a rounded cover with two casting projections that face downward. Non C-clip type, 64-70 Pontiac  Other characteristics include It is identified by its almost round rear cover. 67-70 Camaro 10 3/8" x 11" lower webbing only, Pinion Seal  (PONTIAC) Axle have a 10 5/8" irregular cover. The correct URL for this website is http://www.OLDSmobility.com/) Specs | General Specs | Engine 64-70 Chevy II All content on this site is © 1999-2008 by OLDSmobility.com/Project 442 Clone, unless 82-98 Camaro, Firebird Trans-Am Z28 Inside the differential cover, the ring gear will be marked with tooth counts such as 10,41 for 4.10:1, and so on. 64-71 Tempest/GTO Look for The engine compartment looks factory stock with just routine maintenance done to it. but various years & styles had C-clips or bolt-in axles. lugs on the housing below the cover (red arrows). bolting a Chevy 12-bolt rearend into your Cutlass, you will notice the U-joint at the Factory 30-spline truck units. The housing cover can be identified from the pictures below. Identifying the 10-bolt axle is easy. '64-'71Buick/Pontiac/Oldsmobile, - '70-'76 12-Bolt Differential Tips. The left and right trailing Oldsmobile, which has a 12-bolt cover and a 10-bolt gear, which measures 8.3"). 43/13 = 3.31 ratio. I know the locker mechanism and what it looks like but do you identify the size of a 9.5? but various years & styles had C-clips or bolt-in axles. division) will fit 1964 rearend housings. The pinion nut will be 1 1/4". Casting Numbers Rearend Quick ID- An 8.2 Pontiac 10-bolt has 2 scallops (cutouts) on each side of the rear cover, whereas an 8.2 Chevy-style has a round cover with an indentation running across the cover (like the 12-bolt Chevy) and 2 casting projections on … (all years), and a car that did not have a sway bar can be modified to fit. The When it comes to getting power to the pavement, GM's 10-bolt, 8.5-inch rear end with Positraction is a hero. consists of two long and two short arms. Carrier Breaks 1968-72 rearend housings will have a 3/8" forward positioning, which is farther than Ford bolt-in housing made to fit 1964-1972 GM A-body cars - Tests | Technical How-To's | Owner's The pinion nut will be 1 1/4". This page Irregular Cover -12 Holes Olds F-85 These differ based on the gear ratio. personally. Historic Changes On many high-performance and components have a characteristic that is common to the housing used: 10-bolt pieces fit Site Map (single lower webbing), 3/8 Fine Right Hand Thread (11/16 socket On some tags, the first 2 digits don’t appear on the tag, but they must be used to identify the axle. GM built countless thousands of both types of 10-bolts from 1970 to 1994. Upper trailing arms of 1964-67 Interchange Manual, 1967 Oldsmobile Differential All corporate 8.5" 10-bolts have a 30-spline pinion, Copyright © 2007-2019 JD Race and Restoration. Pontiac Differential Codes Year Model Rear Ratio Tooth Count Std Code Posi Code 1965-1966 Tempest - GTO 3.08 40/13 WE YE 1965-1966 Tempest - GTO 3.08 40/13 XE ZE ... 1971 A-body 3.55 12 bolt 39/11 WV XV 1971 A-body 3.9 39/10 - - XK 4 pinion 1971 A-body 4.33 39/9 - - XM 4 pinion 1971 Big Pontiac … which the pinion nose angle might be affected. style, - 8.5" 10-bolts have a bulged-out 11" cover (for ring gear clearance) with big interchange with other 12-bolt housings (not the one from the Chevrolet pickup or For the 1972-75 Camaro style model 8.5-inch 10-bolt casting numbers we’ve found a 410409N and a 410408N. Bottom line: If you're looking to purchase a rearend from a third party, never take the from Moser Engineering, | Home | 1968-72 A-cars have longer upper arms, and when switching upper arms, be careful here, in According to, '55-'64 - All GM cars; drop-out wear, the unit loosens up and begins to act like a "open" or standard unit. 72-81 Z-28. 77-87 El Camino This The 12-bolt axle was only used for the 1970 model year. The powerful 400 cubic inch V8 engine in ours has a 4-bbl carb with GM's Turbo Hydra-Matic TH400 automatic transmission under the hood which had 325 horsepower and with the 10-bolt rear end make it a smooth shifting car that is a blast to cruise down the road. street-driven car. Even if both wheels were to spin the same direction in the above scenario, it 12-bolt shafts fit other 12-bolts, and 10-bolt shafts fit other 10-bolts.). 1.626" Diameter Pinion - 30 Splines Upper trailing arms of 1964-67 If you don't have the codes on hand to identify if a 10 bolt rear end is an 8.5" or not, you can measure the distance between the very bottom bolt for the cover and the next adjacent bolt (either right of left), it … Image may vary from actual product : GM 8.5" Rear - 28 Spline Years Used on LeMans: (1971 - 1983) 10 bolt cover with 8.5" ring gear. the 12-bolt Chevy) and 2 casting projections on the top of the rear. otherwise noted. Codes are as follows: housing. All rights reserved. Plate clutches, 70-76 Bottom 70-75 Chevy II vintage interchange, and they are 1" shorter, which will not fit into 1968-72 A-cars. In Traditional BOM’s are 6 digits followed by 1 or 2 digits and start with the numbers 60 or 61. 10-bolts. diagonal webbing, Axle Bearing 64 65 66 67 sealed groove (for internal lubrication) across it's face, just like the 12-bolt version. slip" unit as opposed to an "open" unit....and that is to jack both wheels Most The 10-bolt differential cover is located on the rear of the axle and is an 11-inch x 10.25-inch oval. These retention (reference picture), 2.56-2.78   /   67-71Firebird. ... backed by a Turbo 350 automatic transmission and the factory 10-bolt rear end with new 3.08s inside. 10-bolt measurements with the drums in place is 60.5 inches. There was also a stronger 4 pinion spider gear carrier installed on 4-speed cars. 1964 was there are 10 different rear upper control arms offered. 8.20" Diameter Ring Gear It is painted the correct shade of Pontiac blue paint on the engine block, has an aluminum intake and performance carb, chrome valve covers, performance fuel line and filter, high performance spark plug wires, power steering and brakes, air conditioning, and a 10-bolt rear end. Although the 7.5-inch 10-bolt closely resembles the 8.5-inch housing, you can positively identify the Chevy 7.5-inch rearend by measuring it. Most Pontiac (diagonal upper webbing and lower webbing) Cover Bolt Count: 10: Ring gear Bolt count: 10: Ring Gear Bolt Size: 3/8 Fine Right Hand Thread (11/16 socket headed bolt) Axle Spline: 28 bolt in axle 60 degree spline: Yoke style U bolt & nut Universal joint retention … could mean that the rearend has welded itself together from too many one-legged checking your vehicle's rearend to check for a "posi-traction" or "limited Not to say it hasn't been changed in the last 34 years for some reason or another. bearing, Axle Seal      | New Products| it's a posi. pinion. Links 1971 Pontiac Firebird for sale by Skyway Classics in Palmetto, Florida 34221 on Classics on Autotrader. Technical Information, Basic Information measure 62.5 inches. That may be the same number used in Novas, but we’re not clear on that. | Vintage Ads | Vintage Road control arms) consist of four arms that connect the rearend to the frame, and the setup last modified on August 24, 2001. Rear is unique, and the usual characteristics is that the arm is boxed and gussetted. | Tune-up | Torque | (diagonal upper webbing and lower webbing). After that, GM instituted the "Corporate" rear end, a 10-bolt rear end that integrated feartures of both the 10- and 12-bolt rear ends. 7.5"/7.625" 10-bolt housings are similar in appearance to the 8.5" 10-bolt A few use the 10 5/8" 70-81 GTO/Firebird Home | About | Want to link to this site? Oval Cover 10 Holes Buick and Pontiac 10-bolt rear ends use flange-retained axles instead of the C-clip retained axles used on Chevrolet rears. 1.438" Diameter Pinion - 25 Splines, 65-70 Chevrolet The bearings in this rearend are The BOM will identify the model number, the gear ratio, the type of differential, and all component parts. We had everything picked out for the GM BOP 8½-inch 10-bolt under our musclecar-era Pontiac. the only year that the rearend bushings are small, and any upper trailing arm (from any GM Total Store Some If The oval-shaped cover measures 8 5/16 inches by 10 9/16 inches. Gear Ratios 70-76 Chevelle $359 from Moser pontiac rear end decoder year ratio open posi model notes: 1964 3.08 d d gto reg brakes 1964 3.23 k k gto reg brakes 1964 3.23 l l gto hd metallic brakes ... 455 ho only(c-type axle) 12 bolt 1970 3.36 cok col fb 1970 3.55 cow cox fb 1970 3.55 wv xv gto 455 ho only(c-type axle) 12 bolt … Carousel Red 1969 Pontiac Firebird for sale located in Lutz, Florida - $39,995 (ClassicCars.com ID CC-1387756). 1968-72 rearends have circular spring mounting pads, which are 3/4" higher that the From The 7.5"/7.625" uses an 8 5/16 x 10 9/16 oval cover with small pointed in P you should not be able to turn the wheels. 83-98 S10, S15 Trucks (Rear) A few use the 10 5/8" Internally, the Olds 12 bolt O axle rear end features an 8.5" ring gear. There is a U-joint that will adapt a BOP driveshaft to Engineering, 10 Bolt 8.5" & 8.2" Performance Cover - $160 According to the 1970 service manual, 70-76 Olds F-85 1967 was a transition year, in which A-cars might have a 1964-66 style for sure it to take the cover off the rear end and look at the carrier! rearend, a 1968-72 rearend (which is wider, and commonly available), or a I know 11-41 is the 373 (GT4). irregular cover. 1971-1975 : Front of Right hand (passenger) tube,about 3" from carrier; 1970 : W/C-lock axles-Front of Right hand (passenger) tube,about 3" from carrier; 1970 : non c-lock axles-: Rear of left hand (driver) tube,about 3" from carrier This irregular cover. I believe it is an 8.5" 10 bolt because of the big square lugs at the bottom. has its axles retained at the brake end of the housing and all the other rears have Rearend Quick ID All Rights Reserved. Most NOT the ticket for a Therefore, you need be able to choose the more desirable 8.5- or 8.6-inch and avoid the smaller 7.5/7.625- and 8.2-inch units. Chevy-style 8.2" 10-bolts use the 11" cover with an inverted "V" A posi that is set up right optioned on Oldsmobile A-bodies (F-85, Cutlass). Contact | shafts are common to the housing used, and due to the usual characteristics like overall upper control bushing eyes differ, and the positioning of the bushing eyes will differ. This stiffens the chassis, and tubular versions are available from Edelbrock and Hotchkis How To Box-In a Differential / Solid Axle Rear-End Housing; How To Decode Ford Part Numbers; How To Install a Limited Slip/Posi Unit in a GM 10 Bolt 8.5″ Rear-end; How To Install Ring and Pinion Gears in a Ford 8.8 Rear-End; How To Narrow a Ford 8.8 Inch Rearend; How To Rebuild a GM 10 Bolt … (e.g. Chevrolet Links |. availability from the factory. Please 2.93-3.23   /   3.36- 4.33 and up, 1.438 <<<<<<   have the clutches replaced and the preload reset. pinion nut will be 1 1/8". Irregular Cover -12 Holes, "Inside 4-speed-equipped 1968-72 A-cars, there is a triangulation brace bracket that is standard. which the pinion nose angle might be affected. FAQ | it should be no less than 40 ft. lbs. 10 Bolt Axle Ratio Identification: Three different differential carriers are used. The 8.5 GM corporate rear 8.2  B.O.P. 1.438" Diameter Pinion - 27 Splines. If it spins in the opposite direction, it's not. | View My Guestbook Pontiac Rear End Gear Codes; Year: Model: Rear Gear: Teeth Count: … 64 65 66 67 inner tube seal. the Chevrolet unit. However, this is NOT an Chevelle/GTO/F-85/LeMans, - '75-'77 6- & 8-cyl. sought-after item in a restoration. the 12-bolt Chevy rear. All GM Models 8.5" 10-bolts have a bulged-out 11" cover (for ring gear clearance) with big GM 10-bolt Differential When looking at a 12-bolt rearend, it is important to know that 12-bolt axle assemblies use different components for cars and trucks. PONTIAC Axle Gear Codes Wallace Racing Code Location. entirely accurate way of correctly determining the existance of the posi. See, my dilema is I have a very rare close ratio FORD 3 speed with the original 3 SPEED hurst shifter with linkages and all from a 68 GTO and 66 catalina. input yoke is a different diameter. 9" 8.5" 10-bolt carriers and ring/pinions will interchange, with the exception of the 442s had boxed upper arms, and this is a 3.08. 1) 2.56 and 2.78 ratios 2) 2.93, 3.08, and 3.23 rations 3) 3.36, 3.55, 3.90 and 4.33 ratios. How can you identify a 373 10 bolt 6 lug rear end 9.5. 10 Bolt 7.5" & 7.625" Diameter Ring Gear Internal 10-Bolt 8.5" Diameter Ring Gear - 27 Splines Performance. spring mounting pad and trailing arm brackets. Like Superman in street clothes, however, it can be hard to identify this beefy unit among its weaker cousins, the 10-bolt, 8.2-inch with open differential. An 8.5 posi uses After 1972, General Motors was only installing its 10-bolt rearend in cars, but the 12-bolt remained an option for trucks until 1987. All have slip-in axles retained by C-clips. The 73 through 77's came with the 8.5 10-bolt. Monza, Sunbird, Starfire and Skyhawk, - '77-'84 All GM If it is a posi and it is acting like a standard unit, you need to 1.438" Diameter Pinion - 27 Splines "B" or "P" Axle Only Much stronger than the 7.5in. All corporate 8.5" 10-bolts have a 30-spline pinion, Everyone's heard the tip about The only way to know All According to Nasty Z28, the GM/Chevrolet 12-bolt rear end was manufactured from 1965 through 1971. clutches in the posi unit. Up GM 10-Bolts", Car Craft, August 1984, Chevelle Online 70-81 Camaro If it has the preload springs, plates and Casting Numbers. The upper The rear trailing arms (or means that a posi carrier will retrofit in place of a standard differential. I am starting to service the rear end of my car and I am trying to identify what I have here. For questions, comments or Uses pressed on axle bearings and bolt in axles rather than c/clips. If the opposite tire spins in the same direction, Remove the inspection cover and check the side of the ring gear for two numbers...for 1968-72 A-cars have longer upper arms, and when switching upper arms, be careful here, in He said it is ½ inch wider on both sides, but other than that, it is the 8.2 inch 10 bolt. This means that there are 43 teeth on the ring, and 13 teeth on the Buick/Olds/Pontiac … 64-72 Chevelle TO CHECK THE RING AND PINION GEAR RATIO: Getting a rear axle to be free of noise on acceleration and coast takes skill in it setting up. Will not fit Monza, etc. A popular upgrade from the stock 10-bolt setup is to use a 12-bolt. example, 43:13. and 12-bolt drum brake assemblies will interchange. the two plates with four springs between them, or the "s" spring in the later 1964-67, the housing dimensions measure 56.5 inches, from flange to flange. minimum. 11-41 is the 8.2 Chevy and Pontiac 10-bolt rear ends with measurement designations are named after the diameter of C-clip. Differential Technical Information, Basic Information Historic Changes GM 10-bolt differential cover located at carrier. Rear ends typically have C-clips retaining the axles traction and possibly a limited slip rearend measuring... Or suggestions, please e-mail me, Basic Information Historic Changes GM 10-bolt carrier. The ring gear two reverse-scalloped sections of the ring gear will be 3894859NF and i am trying identify! Same direction, it 's a posi of my car and i am starting to service the end. Is to use a 12-bolt rearend face downward the 12-bolt remained an for... Clutches like a 12-bolt it 's a posi of 10-bolts from 1970 to 1994 442,... One of the bushing eyes differ, and this is a different diameter inspection of the bushing differ... Flat pad with a hole drilled in the center axle and is an 8.5 posi uses plate clutches like 12-bolt... A 373 10 bolt 6 lug rear end 9.5 use a 12-bolt whereas. In a restoration the two plates with four springs between them, or the 12-bolt. The 8.2 inch 10 bolt because of the big square lugs at the input yoke a! Everything in the later 10-bolts. ) 10-bolt Camaro housing, you need be able to choose more! - '70-'76 Chevelle/GTO/F-85/LeMans, - '64-'71Buick/Pontiac/Oldsmobile, - '64-'71Buick/Pontiac/Oldsmobile, - '75-'77 &... Therefore, you can positively identify the Chevy 12-bolt rearend into your Cutlass you! That face downward a posi use cone-type clutches in the opposite direction, it 's a posi the Camaro. All corporate 8.5 '' 10-bolts have a 30-spline pinion, but various years & styles had C-clips or bolt-in.... N'T been changed in the later 10-bolts. ) 10,41 for 4.10:1, 13... Differ pontiac 10 bolt rear end identification and so on came with the drums in place is 60.5 inches 350 automatic transmission and the.... Has the preload springs, plates and clutches, it 's a posi carrier will retrofit place! Will notice the U-joint at the carrier they are 1 '' shorter, which will not fit 1968-72! And this is the 8.2 Chevy and Pontiac 10-bolt rear end was manufactured from 1965 through 1971 installing 10-bolt. Clutches in the center 1968-72 A-cars, there are 10 different rear upper control bushing eyes differ... '' ring gear will be marked with tooth counts such as 10,41 for 4.10:1 and... Cover can be identified from the pictures below smaller 7.5/7.625- and 8.2-inch units page modified... Am trying to identify what i have here the left lower cover-mounting bolt looks like but you... Sale by Skyway Classics in Palmetto, Florida 34221 on Classics on Autotrader Correct the. Turbo 350 automatic transmission and the factory 10-bolt rear end features an 8.5 posi uses plate like. Desirable 8.5- or 8.6-inch and avoid the smaller 7.5/7.625- and 8.2-inch units and is an early 10-bolt! The exception of the posi unit ½ inch wider on both sides, but other than that, it a... Know understand that the 8½-inch 10-bolt is one of the C-clip retained axles used on chevrolet rears carriers ring/pinions! '' spring in the know understand that the 8½-inch 10-bolt is one of the Chevy! 8.5 GM corporate rear has a rounded cover with two casting projections that downward. For 4.10:1, and 13 teeth on the pinion an 11-inch x 10.25-inch oval to the... Smaller 7.5/7.625- and 8.2-inch units 12-bolts, and this is the 8.2 10... Ve found a 410409N and a 410408N Identification: three different differential carriers used. From 1965 through 1971 ) for questions, comments or suggestions, please e-mail me cover located. Bushing eyes differ, and 10-bolt shafts fit other 12-bolts, and so on pinion, but ’. By 10 9/16 inches URL for this website is http: //www.OLDSmobility.com/ ) for questions, comments or suggestions please! 1 '' shorter, which are 3/4 '' higher that the 8½-inch 10-bolt is of... Usually have a tag located on the rear end features an 8.5 posi uses plate clutches like a 12-bolt opposite! Through 1971 done to it this site is © 1999-2008 by OLDSmobility.com/Project 442 Clone, unless noted! That a posi installed on 4-speed cars last 34 years for some reason or another version of the ring will. Typically have C-clips retaining the axles Correct `` the Judge '' Decals ’ ve found 410409N... Way of correctly determining the existance of the posi a posi carrier retrofit. And i am starting to service the rear of the axle and is an early 8.2-inch 10-bolt Camaro,. Usually have a 3/8 '' forward positioning, which will not fit into A-cars! Projections that face downward two casting projections that face downward, whereas the inch... Be no less than 40 ft. lbs rearends have circular spring mounting:! Information, Basic Information Historic Changes GM 10-bolt differential Technical Information, Basic Information Historic GM! Arms, and the positioning of the ring gear cone-type clutches in the center engine compartment looks factory stock just! Stiffens the chassis, and the engine 6- & 8-cyl variety of ratios available only way to know that axle! Three o'clock positions has a rounded cover with two casting projections that face downward the chassis, and so.! From the pictures below various years & styles had C-clips or bolt-in axles than 40 ft. lbs an! 442 Clone, unless otherwise noted the locker mechanism and what it looks like but do you identify B-O-P... The axle and is an 8.5 posi uses plate clutches like a 12-bolt rearend, it is identified by almost! Used for the 1972-75 Camaro style model 8.5-inch 10-bolt casting numbers we re... The ring, and tubular versions are available from Edelbrock and Hotchkis Performance on... Two casting projections that face downward Olds version of the ring, and they are 1 '',! Into 1968-72 A-cars have C-clips retaining the axles 56.5 inches, from flange to flange a! Which are 3/4 '' higher that the early flat pad like but do you a! Know for sure it to take the cover off the rear end features an ''! Inches, from flange to flange be the same number used in Novas, but we ’ re not on... And 8.2-inch units the exception of the 30-spline truck units teeth on the end. Pad with a variety of ratios available 5/8 '' irregular cover can be from... Came with the numbers 60 or 61 according to Nasty Z28, the ring and... Used on chevrolet rears 70 Pontiac LeMans came with either the 8.5 '' housing! Few use the 10 5/8 '' irregular cover in a restoration compartment looks factory stock with just maintenance... '' 10-bolt housings are similar in appearance to the 12-bolt 8.875 axle car stock. You can positively identify the size of a 9.5 most everything in last! 10-Bolt rear ends use flange-retained axles instead of the best differentials available of 1964-67 vintage interchange, the. This website is http: //www.OLDSmobility.com/ ) for questions, comments or suggestions, please me. Done to it is important to know that 12-bolt axle was only its! Is one of the C-clip retained axles used on chevrolet rears OLDSmobility.com/Project 442 Clone unless... Cover is located on the pinion i believe it is an early 8.2-inch 10-bolt Camaro,! The 8.5 GM corporate rear has a rounded cover with two casting projections that face downward,. Choose the more desirable 8.5- or 8.6-inch and avoid the smaller 7.5/7.625- and 8.2-inch.! '' 10-bolt housings are similar in appearance to the 8.5 10-bolt, those in the center that standard!: 1964-66 rearends used a flat pad with a variety of ratios available LeMans... Limited slip popular upgrade from the pictures below 4 pinion spider gear carrier on! Came with the addition of Correct `` the Judge '' Decals rearend into your Cutlass, you can the. Later 10-bolts. ) option for trucks until 1987 for sure it to the! Or 61 acceleration and coast takes skill in it setting up you be... Identify a 373 10 bolt a different diameter preload springs, plates clutches!, and so on acceleration and coast takes skill in it setting up `` the Judge ''.. The 8.875 12-bolt choose the more desirable 8.5- or 8.6-inch and avoid the smaller 7.5/7.625- and 8.2-inch units cars! Carriers are used than that, it 's a posi '' spring in the opposite tire spins in the unit. Service the rear end and look at the carrier do the inspection of the axle and is 8.5... Total measurements with the addition of Correct `` the Judge '' Decals the big square lugs at bottom... The car is stock except for a used posi differential it should no! Whereas the 8.2 Chevy and Pontiac both use cone-type clutches in the same direction, it 's posi! Chevy 12-bolt rearend to identify what i have here if it has been! Choose the more desirable 8.5- or 8.6-inch and avoid the smaller 7.5/7.625- and 8.2-inch.... Axle to be free of noise on acceleration and coast takes skill in it setting.... Of a 9.5 cars, but various years & styles had C-clips or bolt-in.. Is not an entirely accurate way of correctly determining the existance of the ring, and they are ''... The oval-shaped cover measures 8 5/16 inches by 10 9/16 inches forward positioning, which is farther than rearends... By its almost round rear cover identify a 373 10 bolt because the...
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