Input your stock and new tires sizes along with your original gear ratio. Another way to tell the difference between an 8.2 and an 8.5 rearend is to pull the cover and look at the bolt holding the spider gear crosspin. But, did you know there is more than one style of 10-bolt rearend? There are a couple of ways to find the gear ratio on a GM rear end. . I just also won a bid on a 1977 GM Dealer Album. I e-mailed a salvage yard about the numbers I found stamped on the axle tube of my 10-bolt chevy rear end the numbers are: XKP K211 1 They said that the XKP meant that it was a 8.5 ring gear, 3:73, locker, and the rest of the numbers meant that it had 2.25 wide brake shoes and that it was between a 1993 to1995 year model. . The differential gear experts at Ring and Pinion Service are also a great resource and would be happy to recommend and install the ideal ratio for your needs. If you’re looking for a good.economical 10-bolt rearend to rebuild or install into your hot rod, you will need to be able to accurately identify the different units so you don’t accidentally come home with a 7.5 or 8.2-inch differential. Rear-End / Differential Gear Ratio Calculator. . Products include ring and pinion sets, installation kits and axle shafts for GM, Ford, Chrysler, Jeep, and Toyota vehicles. GM 10 Bolt 8.6 is actually an 8.625. All rights reserved. The straight 6 cyl and 305 v8 got 7.5" 10 bolt rears with 2.73 ratio . Rear spring mounting pads differed in that 1964-66 rear ends used a flat pad with a hole drilled in the center. 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The distance between the lower center bolt on the cover and either adjacent bolt is 3 3/4 inches. . Adjustments for backlash is done by spanner rings in the housing or shim packs behind the carrier bearing cups (GM) or cones (Dana). Nissan 4 Speed Manual Transmission Overhaul Kit, Auburn Positractions LSD - How They Work, LockRight Toyota, Honda, Nissan, Isuza, Suzuki, no-Slip Dodge Chrysler, Aspen, Challenger, Charger, Dart, Diplomat, Magnum and Marada. Thinking about changing tire sizes? Again, this would be okay in a daily driver or cruiser application, but if installed behind an engine with horsepower numbers climbing into the 400 range, you can plan on an eventual failure. 13. Only 2 ratios was used in the 76 nova . That said, if you regularly tow heavy trailers or prefer a peppier feel in acceleration, consider a truck equipped with a higher numeric axle ratio. As our Gear Ratio Calculator explains, the gear ratio is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear. There were an untold number of 8.2-inch axle assemblies built, and although it is only marginally stronger than the 7.5-inch rearend, it does have some aftermarket support. If it takes a 5/16-inch wrench to remove it, it’s an 8.5. . Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes. This is a critical number to ensure that you find correct Dana parts the first time. That’s usually proven when used in high-performance, high-horsepower applications. We specialize in matching your tire size and ring and pinion ratio for your specific application and needs. 3. Inside, the ring-gear bolts are the same as the 8.5 corporate unit, but the pinion-shaft diameter measures 1.438 inches. Good luck finding one of these, however, as they are very popular among performance enthusiasts. . . © 2017 Power Automedia. . It wasn't until late 1972 that the 10 bolt 8.5" ring gear was used in Chevelles. Enter the maximum potential safe engine RPM. Different types of differentials, whats the difference? How To Size A Carburetor Properly, Real Street Performance Puts 22 In-Tank Fuel Pumps To The Test, Design Engineering’s Lightweight Headliner Drops Cabin Heat And Noise, Chevrolet Trucks 1955-1959: How To Build & Modify, If You’re Ready For A Really Big Big-Block, Here’s Your Mill, Hidden Horsepower: Revealing The Secrets Of The Oil Control Rings. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. The rear end is full of it. If changing the gear ratio is desired, it is important to know exactly which rear housing is present. The table below will help you determine what rear end ratio you have by using your RPO code, answering the question: What rear end ratio was in my Chevrolet or GMC vehicle when it left the factory. We have a large selection of gear sets in stock and can recommend the correct gear ratio to match your engine horsepower, transmission specs and tire size to give you the desired performance. While the 10-bolt rearend’s lineage can be identified by the code stamps, which are usually on the passenger’s side axle tube, there are literally hundreds of potential codes for the three different 10-bolt rearend housings. According to Chevy High Performance, the 7.5-inch was standard until 1993, when the previously optional 7.625-inch became standard. Mine was 2.73 and changed it to 3.73 ratio. The easiest way to identify the 8.2-inch rearend at a glance is by the shape of the housing and the spacing between the lower bolts on the cover. . . Sierra Gear & Axle is a premium line of light-duty differential parts. Like the 8.2-inch 10-bolt, the 8.5 10-bolts use C-clips to retain the axles. Tire diameter is the first consideration because styling and available space within the wheel opening dictate the size of tire / wheel combination that will be chosen for the car. If playback doesn't begin shortly, try restarting your device. Sierra Gear & Axle parts are designed and engineered to the highest quality specifications for use in street, off-road and performance environments. Like most 10-bolts, the axles are held in place by C-clips on the inner end of the axles. The pinion nut should also measure 1 1/8 inches, if the OEM pinion nut is still in use. 8.2 10-bolt: ED 21118: 2: 2.73:1 and down : EDB 30116: 3: 3.08:1 and up . . Build your own custom newsletter with the content you love from Chevy Hardcore, directly to your inbox, absolutely FREE! Unfortunately, unless you have the two units side by side, it is nearly impossible to tell them apart. It wasn't until late 1972 that the 10 bolt 8.5" ring gear was used in Chevelles. If used in a daily driver or cruiser application, the 7.5-inch rearend should survive behind an engine with 350hp, if traction is limited during spirited driving. 10-41 is stamped on the pinion head or stem and. This can be checked by dividing ring gear tooth count by the pinion tooth count. The gear tooth ratio of the ring and pinion for example. go on the 3 … . With this number, you can tell exactly what components the factory used in the assembly of your rear end. . 10 Bolt: Chrysler 8.25″ Chrysler. Like all Chevy 10-bolts, the axles are retained by C-clips on the inner end of the axle shaft inside the carrier. The value will be returned in estimated differential gear ratio, based on the entered values… . gm® 8.5" 10 bolt front & rear / 8.6” 10 bolt rear style . If you have installed larger tires, they rob performance, and you would want to go to a lower ratio like a 4.56 or 4.88 depending upon your tire diameter. go on the 2 series carrier 2.73 and lower ("lower" gears = higher numbers, like 3.08, 3.23, etc.) 10 Bolt: Chrysler 8.25″ Chrysler. Bargin Basement Differential Part Save Money! The date and location of manufacture coding changed in 1971. That is the impetus for why we decided to put this swap meet/junkyard identification guide together. . Therefore you can calculate the axle ratio. This page is a Differential Gear Ratio Chart for comparing tire size to axle gear ratio and the combined effect on power and fuel economy. 8.2 10-bolt: ED 21118: 2: 2.73:1 and down : EDB 30116: 3: 3.08:1 and up . . Make Inspection Cover Bolt Count Differential; AMC. You're signed out. The axle shafts are also held in place by four-bolt retainer plates at the outer bearing, not C-clips. Decoding Chevrolet VIN, trim tags, cowl tags, engine, engine block casting numbers, cylinder head casting numbers, intake manifold casting numbers, transmission, interior codes, and paint codes. e.g. Revolution Gear GM 8.5 Inch (1970 and Up) 10 Bolt Ring and Pinion Gear sets utilize the same gear cutting methods as the Original Equipment manufacturers, employing a Dry 2-Cut process producing the absolute quietest 8.5 Inch gear available with optimal surface finish and contact patterns. . I'm running a ring gear spacer in a 10 bolt for my Austin with a 327, and it seems to be working just fine. 3.08 and numerically lower gears = 1.660-inch, 3.23 and numerically higher gears = 1.950- inch, 2.73 and numerically lower gears = 1.615-inch, 3.08 and numerically higher gears = 2.00-inch, 2.56 and numerically lower gears = 1.530-inch, 2.73 and numerically higher gears = 1.720-inch. Consult our Look up chart for determining engine RPM, gear ratio and tire size combination. https://www.chevyhardcore.com/tech-stories/drivetrain/10-bolt-chevy Many times, if you locate a 10-bolt rearend, it’s usually a 7.5-inch unit.
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