Gearing for the strip To find the ideal gear ratio for drag racing use your RPM at peak HP. Calculate Rear End Gear Ratio needed. Scroll through the list of popular transmissions to find yours. Or, change input variables (engine RPM, axle gear ratio and tire height) to determine vehicle speed in each forward gear. The right side will show the results. The tooth count ratio of 43/8 means 43 teeth on the ring gear and 8 teeth on the pinion gear. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Ring and pinion ratios (also called axle gears) are expressed at tooth counts (e.g., 43/8) or decimal ratio (e.g., 4.27:1). 275 is the WIDTH of the tire tread in millimeters, 75 is the ASPECT (or percentage of tread width to yield the sidewall height), and 16 is the WHEEL diameter. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. The gear ratio selected for the drive axle impacts the truck's available top-end speed, ability to haul or pull heavy loads, and overall fuel economy. Metric tire specifications follow a three number format, for example: 275/75R16. Select the value you want to solve for. « Modification Cost Effectiveness Calculator Overall Gear Ratio Calculator ... 1955 Ford Truck With Diesel Power is Unique in Every Way. A good way to calculate this is to multiply .12 by your Jeeps tire diameter (Example: .12 X 38" = 4.56). Road Speed Calculator Calculate the top speed for various axle ratios. ... trucks, and of course, hot rods. Think I fried my PCM, advice? Todays date is 3/22/2021 Calculate your Rear End Gear Ratio Needed. Posted In 1948 - 1956 F1, F100 & Larger F-Series Trucks. Daily Slideshow: This killer F-100 build is what you might call a bit of a rebel. If we divide 43 by 8 we get 5.375, which is usually rounded to 5.38. But there’s hope, swapping in ring and pinion gears with a higher numerical ratio compensates for your mods. Determining actual Tire Diameter or “Height” is the first step to using the RPM calculator to find the best gear ratio. Read It. Back to Calculators Index. This calculator will give you the gear ratio, just plug in the numbers. Engine RPM Transmission gear ratio Ring Gear/Pinion Gear Teeth to Gear Ratio: ... Now that you have your truck lifted, you want bigger meats. AutoAnything Gear Ratio Calculator Huge tires look awesome on your big rig, but monster mudders change your truck’s gearing, killing acceleration and draining precious MPGs. Posted In 1999 - 2003 7.3L Power Stroke Diesel. Ring & pinion gear ratio Tire height (in.) Building a Shop. Ring / Pinion - Gear Ratio: Okay, so you've torn your pumpkin apart and have the ring gear and pinion gear teeth count. Overall Gear Ratio Calculator ... Posted In 1961 - 1966 F-100 & Larger F-Series Trucks. This calculator will help you compare the total cost of ownership of an UltraShift HV equipped truck compared to an Allison Automatic transmission equipped truck. Advertising | Contact Us | Cookie Policy | How Does the 2021 F-150 Stack Up to The 2021 Silverado? Use this calculator to determine your gear ratio and vehicle’s speed in any gear and any engine RPM for best performance. Gear Ratio And Tire Size Calculator When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. The left side of the calculator requires all three entries. Enter the following values. The New Ratio box will show the ideal gear ratio (getting as close to stock as possible). For the Tire field, enter your tire diameter in inches. If you want a bit more power, for rock crawling, go with something closer to the Lo Ratio number. 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