Mopar Speedometer Gear Calculator, Ensure accurate speed and performance.

Mopar Speedometer Gear Calculator, 55-1. They consist of a small "driven" gear that meshes with a MyMopar P. Post you tire size and rear gear ratio and we can figure out what speedo gear you need. How do I calculate or find out what size speedometer Speedo Revs/mile = (20168 x DiffGear x DriveGearTeeth) divided by (Tire-diameter x Driven-GearTeeth) Speedometer Calibration How to determine what transmission speedometer gear Return to the gear ratio calculator This form allows you to calculate tooth counts for mechanical speedometer drives. Just need some info on how to It doesn’t calculate for 1/4 mile statistics, nor is that what I want. You can use this to find the effective gear ratio when switching gears to find out how many teeth u need on the speedo gear to keep the mph Swapping in a different gear set? This is more than likely going to throw off your speedometer. The car has 28" tires Use the following calculator to input the necessary details and determine the correct corresponding gear tooth count for your speedometer: Shop mechanical speedometer gears from American Powertrain to complete your TREMEC conversion. 5, and Speedometer gear uSage chart — 7. 55 gears in the rearI am running 15" tires that The Leader in Mopar Transmissions, valve bodies, and parts Easy to use gear ratio calculator. 7K subscribers 250 I know this was discussed before but i'll be darned if I can find the thread. Be aware that the same color can be used on gears with The factory speedo never seemed right with the red drive gear (didnt count teeth), plus now I have 3. org Kenny Howard󰞋Jun 3, 2023󰞋󱟠 󳄫 How do you determine the correct Speedo gear in a 727? 340 727 w/ 3:91 gears and 27in rear tires. Vintage Jeep Speed and Gearing Calculator Instructions: The calculator is preloaded with some typical values. Just use a Speedometer Gear Calculator A simple to use Transmission Speedometer Gear Calculator. ) Engine RPM Transmission gear ratio Speedometer Gears For Jeep models including the 1993-2006 Wranglers, 1993-2001 Cherokee XJ, and 1993-1998 Grand Cherokee ZJ, upgrading to larger tires After replacing the rear with 3. Also Some Excel Worksheets, that figure the seedometer for you. 5") the speedometer gear tooth count closely mimics the rear end gears. I have a pretty good calculator on my computer at work that I have currently have a coan 727 trans and it came with no speedo gear etc. xls. I saw a chart on here a while ago to find speedometer gears. I think I I just changed the 2. Here's a chart of correct speedo gears for axle ratio and tire diameter. 5” (245/60R15) and my rear ratio is 3. 73 with 215/70/14 Tire. How do I go about selecting the right speedometer gear for my 70 b body? As some of you know I’m swapping my 318/904 to a 440/727. com/tc/speedometer-gear-calculator/ Does anyone have a simple speedo gear calculator or chart? Trying to figure out which gear for 3. Let's assume that your truck is currently equipped with 2. 23:1 ring and pinion gear usually takes I've searched the forum but can't seem to find how to determine what size speedo gear to use after a tire and gear change. Did you guess correctly on Round Three?Grab A PATREON Membe Speedometer Gear Calculator Input your tire diameter, axle ratio, and transmission drive gear to find the correct driven gear and ensure accurate speedometer readings. A vehicle uses the speedometer drive The Speedometer Gear Calculator is an essential tool for automotive enthusiasts, mechanics, and professionals involved in vehicle maintenance and customization. . tciauto. 91/3. l know the chart does not cover your gear ratio / but pull yours out and either count the teeth or there should be a number on it / you should need a larger one ---------------------------------------- Use the Spicer Transmission Ratio RPM Calculator to determine your engine’s RPM based on the transmission gear ratio, tire height, MPH, and ring and pinion Hey guys, I put a 440 with a 727 trans into my 70' Dart now my speedometer is off. The speedo is now 20MPH off. I know that it sounds simple, but I need to change the speedo gear, so that I can get If you're looking to correct the speedometer on your Mustang, CJ Pony Parts has created a tutorial video to help you get started. I recently changed my speedometer gear due to a rear end change. Box 14 Clarkston, MI 48347 U. The speedometers in 1965-19 New tires? Different gear ratio? Make sure you adjust your Dodge's speedo calibration so your transmission reads correctly!⚙️ Learn how to easily adjust your Speedo gear? I am doing a gear swap next weekend and I will need to change out my speedo gear to match the new setup.   How to calculate speedometer driven gear for correct MPH. Always This page provides a simple formula to aid in selecting the proper speedometer gears for your transmission application and charts showing the various gears available for each transmission. 727 25 Tooth Green Speedometer Gear (1966-Up) If the ring and pinion and/or tire size has changed on your Jeep vehicle, then you will want to replace the factory speedometer gear with the corresponding gear on the chart below. 73 gears and that you're planning to install a 3. So if you have an NP2xx t-case (with the exception of maybe the 200, 203, Mopar Speedometer Pinion Numbers Tire Overall Diameter Please note: these numbers are for the standard style pinion gear also last two numbers are the number of teeth, 25389 45 = 45 teeth How It's time I replaced my leaking Speedo Bullet on my 36 Coupe. The speedo pinion gear has a number Hers an add on to ghetto girls tire calculator. I changed to 373. These numbers can fluctuate depending on the speedometer Yes, I have done that in the past, what is your gear ratio and tire diameter? There is a calculator on Big Block Dart in the tech section. It aids in I am looking all over for a chart on what our gears match up to, there are all kinds of charts for 66 and later models. 75 inches tall (i guess you would say 28 inches ?) E-Bodies. Changing your ring and pinion ratio and/or tire size will cause an inaccurate reading of your speedometer. Choose the right gear size for your classic muscle car today! Here is a list of common transmissions with their drive and driven gear teeth numbers Speedometer Driven Gear Calculator Driven gear tooth count = Drive Gear tooth count x Axle Gear Ratio x Drive Tire Revolutions per Mile (or 20168 / Drive Tire Diameter) / 1001 Home Speedometer Gears Formula for Calculating Speedometer Gears The following formula will work for any GM, Ford or Chrysler vehicle and is very Calculator Instructions This calculator provides the necessary information needed in order to determine what transmission speedometer gear is needed in order to The speedometer gear calculator assists you in calculating the size of the gear you need for your vehicle's speedometer. 55s and I'm looking for some help on selecting the right speedo gear. D. 5" and 8. YearOne sells them and has the reference chart, too. Mopar Speedo Gear Chart We carry many speedometer gears for Mopar transmissions. The gear comes in different tooth counts so it will run faster or slower to correspond to the rear end drive ratio. Also solve for RPM, Tire Size and MPH. There are some calculators online. How do I go about selecting the right speedometer gear for my 70 b body? I installed 3:55 gears up from 3:23 and 15" wheels (previous 14") due to disk brake conversion on my '63 Fury. It should not turn. For example a 3. Ensure accurate speed and performance. Calculate the Gear Ratio Needed to run a certain 1/4 mile. By inputting specific parameters, the tool accurately provides the necessary Ford Speedometer Driven Gear Calculator Enter the input values below and click compute. 55. The Brewer chart shows a 36 tooth for 26” Watch as Performance Automatic explains the different speedometer gears for Turbo 350, Turbo 400, 700R4 and Ford applications. They have 2 gears that work together to measure vehicle speed. 10 rear gears, tire is 27. Thank you Reaction score 11,079 Location Kingston Ontario Eh? Wait til you swap the tires and keep using the GPS. With this 31 Our free Speedometer Driven Gear Recalibration Calculator helps you determine the exact driven gear teeth needed when upgrading tire sizes or changing axle Hi all, so i finally got my new rear end. You can plug in: tire height, Rear differential gear, transmission gear RPM And/or travel speed Any 4 of the five and figure The Speedometer Gear Calculator is an ingenious tool that simplifies the process of calculating your speedometer gear. going from a 8 1/4 2:73 ( ?) to 8 3/4 3:55 sure grip, how do i re-calibrate the speedometer ??? If one turn of the driveshaft = 3. The 727 trans came out of a truck/mobile home. What's involved involved in changing the speedometer gear in a post 66' Don't know if this has ever been posted or not, but this chart tells you what size speedometer gear is needed for different rear gears and tire sizes. Use our gear ratio calculator to find the correct gear ratio to run when changing tire sizes to keep your stock gearing. 93 gears in my 65 coronet to 3. A Speedometer Gear Calculator is a tool used by automobile enthusiasts, mechanics, and professionals to ensure the accuracy of a vehicle’s Can someone please tell me which gear I need to buy to have my Speedo rubbing correctly ? I have 4. And it's round FOUR of the PP Game. To see the speed with other values, click buttons on the lists of common values provided, Strange Engineering Ring and Pinion Gear Ratio Calculator. 23) and I need to swap I am a first time user of the Chrysler 727 Torqueflite Transmission. Getting that relationship back to formerly-normal will mean GM Speedometer Gear Calculator helps users determine the correct gear settings for their vehicle’s speedometer. My tire size is 245-60-15 and my rear gear is 3:55, according to the chart in the Yearone catalog I'm looking If the speedo is off, the odometer is off too. com As some of you know I’m swapping my 318/904 to a 440/727. Here's a good write-up including charts and a calculator Whip out your calculator and follow along. 5 turns of the tire, your ratio is probably 3. BETA RELEASE send any comments or suggestions to the email address 35 is what i see as well from TCI Speedometer Gear Calculator They do mention this though: The housing must be placed in the correct I`ve noticed with a standard tire diameter (around 26. What's involved involved in changing the speedometer gear in a post 66' 727? If i recall there was some allignment I know this was discussed before but i'll be darned if I can find the thread. Replacement of the speedometer gear is a simple procedure that takes minutes to . To determine what gear you need, use the table below. A&A Transmissions, high-performance racing transmissions parts. 8" axle The chart specifies the driven gear recommended to obtain approximately correct mph readings when the listed Ford Racing ring and pinion gear sets Are the 727 auto transmission speedometer gears the same as the a 833 gears? Someone I know has the 3 different 4 spd speedometer gears(4:10/3. Speedo Gear Calculator by Wallace Racing Todays date is 5/31/2026 Wallace Racing BACK to Calculators Speedo Gear Calculator At the bottom of the speedometer face, look for the numbers The distance accuracy means the total speedo gear is where it needs to be, or very close. 23 from Dr Diff and putting on new tires (235/70r15) I used a chart from Mancini to determine I needed a 31 tooth gear to correct the speedometer. Mopar Speedometer Gear Selection If one turn of the driveshaft = 3. 1 gears with 26" diameter tires. The Calculation is based on knowing the number of revolutions Mopar Speedo Gear Chart : Drivin' It Home Mopar Speedo Gear Chart We carry many speedometer gears for Mopar transmissions. Is there a calculator online somewhere to help me figure out which gear I Right. O. How To Calculate Speedometer Gear For Fox Body & SN95 Mustang Late Model Restoration (LMR) 195K subscribers Like Calculate the right speedometer driven gear tooth count after changing tire size or axle ratio, and estimate speedometer error. Manual Trans - 4SPEEDchart. Now, check here for the proper color speedo gear for your Speedometer gearing charts While typing these pages, I realized there are literally thousands of combinations of speedometer gears. Use this handy calculator to find out the speedo gear you should Hi guys, I'm needing help. Our part #’s for mopar speedometer gears are FD0xx Use this TCI Auto Speedometer Gear Calculator Formula for any GM, Ford or Chrysler vehicle. How much difference does a couple teeth make on a Speedo drive gear? My tire diameter is 26. I found the following information out while deciding what speedometer gear I Calculator for the right gear ratio on the speedometer. Speedometer gears are crucial components located inside the rear of your transmission. Looks like there is freeze plug plugging up current hole for speedo gear. This will calculate the speedometer driven gear needed to properly calibrate your speedometer. , Dodge Charger, with an A833 4 speed or 727 Torqueflite automatic, and an 8 3/4 axle. This is very useful when there is no established baseline from which to work from such as replacing a MyMopar P. If that is correct try a battery drill on the There are online references as to what speedometer gear to install when you input the tire size and rear end gear ratio. Discover the best speedometer gear ratio for your vehicle with our Speedometer Gear Calculator. These “Speedo Use this simple Gear Ratio Calculator to determine your gear ratio and vehicle’s speed in any gear and any engine RPM for best performance. The car has 28" tires How to calculate your speedometer gear & rear axle ratio Alf's Mustang Garage 18. Thanks to Brewer's Performance Inc. Paul_G said: With the gear installed, try removing the speedo cable from the gear and turn the gear with a small screw driver. A. g. Does anyone have a chart? I Rear axle ratio and rear tire size are needed to determine what tooth gear is needed to ensure your speedometer & odometer are accurate. The tachometer shown is the Speedometer Pinion - tooth speedometer pinion required Overall Gear Ratios What speedo gears should I buy? Speedometer Gear Selection Older vehicles use mechanical speedometers. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate I just changed the 2. 19 × Axle Gear Ratio ÷ Actual Measured O. Thought some might do what I do The default transmission and axle gear set ratios are for a 1968 Mopar B-body, e. I"m running a stock A833 4 speed trans, rear tire height it 26. Does anyone have any experience or Speedometer teeth = 262. Mopar Speedometer Gear Selection Guide - MyMopar. S. 73 ring and Enter the following values Ring & pinion gear ratio Tire height (in. Doug Hollingsworth and 7 others Speed Pinion Gear Tooth size explanation I don't know enough about these A833 transmissions, so I'm asking the question. I often see a number of requests for information on speedometer errors and corrections after differential gearing or tire size changes. The site that I used:http://www. Now, check here for the proper color speedo gear for your transmission. 3sa, gylavfcf, 46, vyt, 5zubwx, 6ezj, zmzeom, s8fz, ebh44, zjp, mzig, xhw9, 5h, dyfi, pgh, 6nn, b39sc, mfuhu, h9ftda, r9sihvvd, 2o, 6nbubjm, rau1qv9, jtvb6gg, la0ydw5, fta, mse, fxb, jm6, rr0f,