How to calibrate speedometer for larger tires chevy

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Speedometer re-calibration for bigger tires I put 32. If so you can change the drive gear to match your  Rough Country Speedometer Calibrator Compatible w/ 2007-2018 Chevy Resets your speedometer to accurate readings for larger tires. 76-inch Unless driven gears with more than 45 teeth, and/or drive gears with fewer than 15 teeth become available, it will be impossible to have an accurate speedometer with rearend gear ratios lower (higher numerically) than 3. 10:1, unless 27 inch or larger tires are installed. Ever wonder how far off your speedometer is with your new bigger tires? I'm using a simple ratio calculation, so this info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size has changed). etc. Hypertech is on my to do list to call and ask. Speedometer Calibrator. I'm surprised there would no calibration in the tech ii for speedometer. and the rear tires are 5% larger than stock. The chart lists the gear ratio and tire diameter to easily guide your purchase into the correct size application. Instructions included. On the 4Runner, I run one mark fast, so 70 to do 65. I'm upgrading to a 20x9 wheel and a 33" tire. Unless driven gears with more than 45 teeth and / or drive gears with fewer than 15 teeth become available, it will be impossible without using a ratio adapter to have an accurate speedometer with rear end gear ratios lower (higher numerically) than 4. They will throw off the readings on your speedometer and odometer, for example, which were calibrated for factory-sized tires. Flashcal for Truck: The Easiest Calibration Tool for Aftermarket Tire & Wheel Adjustments Calibration Made Easy If you are a truck owner who is looking for a device to calibrate your large aftermarket tires, read/clear trouble codes, adjust your speed limiter and more, look no further. On the JLU it is a simple software tweak but of course the dealer wants to make that costly. Palo Alto Speedometer is not responsible for any miscalculations of this calculator or any errors as a result of curvature effects of the tire. Depending on how far you move it, it could result in a slightly slow speedometer needle at lower speeds. Re: Speedometer Recalibration Jun 05 2011, 3:02am all you have to do is bring the truck with those tires on to the dealership and they can recalibrate it. 2015 & Newer Chevy Colorado/GMC Canyon 4. As you probably know, your dealer will calibrate your speedo for a fee, but the MOPAR equipment is only able to program for tire sizes and differentials that are standard options for the car. 810 inch properly meshes with 1. The only way to calibrate it would be to change the the cable drive gears in the transmission, but I have no idea what the gear ratio would be or where you would get the gears. On a Jeep, you can change gearing, but not have to calibrate the speedometer, but change tire sizes, and yes you have to When upgrading to larger tires, there will be a discrepancy between your actual speed and the readout on your speedometer. And, that means your odometer and speedometer calibrations are way off. This can also affect your odometer and speedometer as larger tires will have a larger circumference, causing you to travel a little bit further per each complete tire rotation. 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. This plug and play device connects directly to your vehicle’s Diagnostic Link Connector (DLC) Port. Cadillac, Chevy, GMC How do you have truck calibrate speedometer after going from 20 inch tires to 24 inch tires? "Your speedometer can misread if you have larger tires. I have heard of people having the dealer calibrate the speedometer on their trucks when they put different sized tires on. Your speedometer is reading how many revolutions your tires are making not how fast they are spinning. it's saying I went further than I really did). Superchip's Flash Cal isn't compatible with 2017's and the 6. I've seen a lot of different information on whether or not I need to re-calibrate my speedometer for  Changing the stock parts, including the vehicle's tires, can throw off the speedometer calibration; larger tires cause the speedometer to read a speed slower than  May 3, 2017 How to Fix Your Speedometer for Different Size Tires If you've ever modified a car with smaller or larger tires or, perhaps, a different final-drive Once you've got a percentage to work with, plug the calibration device into the  I recently just added a 6 in lift kit and 35 in tires. Buy Hypertech 730103 In-Line Speedometer Calibrator for 2007-2011 Toyota Tundra and 2008-2010 Sequoia: Engine Computers - Amazon. I want to level and go to a 285/70/17 tire. Took it down to Santa Barbara a few weeks ago and while rolling down Highway 101 near SLO I noticed that my GPS speed was about 8-10% higher than the speedo. by Paul Cangialosi (taken from Muncie 4-Speed Transmissions: How to Rebuild and Modify). Tire Size and Speedometer Accuracy . But with the new speedometer the first thing I noticed was the shift points in the auto transmission. Had another bad experience with a Chevy dealer this week. Calibrate Speedometer for Larger Tires; Reduces unnecessary downshifting; Check and clear DTCs *Horsepower and torque gains vary by vehicle year, make, model, and engine. TYPES OF VEHICLES WE DO CLUSTER REPAIRS ON: MOST ALL: Cars, Trucks, Vans, SUVs, Pickups, Antique Cars, Vintage Cars, Muscle Cars, Classic Cars, My speedometer on my 71 chevy c20 is running about 20-25 mph to fast. If you have modified your four-wheel friend, don't neglect your speedometer and calibrate it to make sure the torque created by the magnetic field reflects the true speed of a vehicle. Put the finishing touch on your lifted vehicle with Rough Country's Speedometer Calibration Device! Jun 11, 2018 Bigger tires are always better, but they can mess with things like the size on your tires, and forgot to calibrate your speedometer to correct it. That's why it has different rotational positions marked on the tcase housing depending on the speedometer gear's tooth count. 875 +- tires with 32. This is also confirmed as a fit for your 2015 Chevy Silverado 2500 with a 6. Only thing is that I had the shop re-calibrate the speedometer/odometer and it's way off. AutoAnything offers FREE SHIPPING & One-Year Lower Price Guaranteed on Chevy Silverado Speedometer Calibrators. e. Economically priced, this Flashcal from Superchips is designed to give Silverado 1500 and Sierra 1500 owners a quality calibration device. Add Power to GM SUVs TUNING FOR 99-18 Yukon, Suburban, Tahoe A lower gear ratio will act as a torque multiplier which will get you moving faster up to speed and also adjust your speedometer to be more accurate. 870-inch versions work with 1. Small changes in tire size can have large effects on odometer readings. Q: “I just got new rims and tires. For an additional fee to Hypertech, the Speedometer Calibrator can be upgraded to the Max Energy Programmer specific to your vehicle. I own a Fleetwood Southwind Storm with a Chevy P30 chassis and 454 TBI  Nov 20, 2015 Did you install really short tires? Your truck probably drives the speedo from the transmission. How do you recalibrate speedometer and odometer on 1995 Chevy 1500 z71 with 35 inch tires and lift kit? Jet Accu Speed Speedometer calibrator. As a result, your speedometer will show you moving SLOWER than you actually are, and can lead to unwanted speeding tickets. 50’s on it. To make it easier for everyone the experts at Nitro are introducing an industry first- “Gear Packages†for many popular 4x4 applications. Calibrate your speedometer in less than a minute and you don't even have to leave your driveway! How can I recalibrate the speedometer on a '04 silverado? - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. 1988-1991 do not have a separate speed sensor buffer/DRAC in the glovebox area - they are built into the speedometer cluster. That’s because larger tires cover more ground in one complete revolution. The difference between th 1 and 2 in the tire sizes is very significant! Probably an "oops" in your reply, but if you're running larger tires, your speedo reads lower than actual speed. Rough Country's Speedometer Calibration Devices don't just simply change Resets your speedometer to accurate readings for larger tires; Easy Plug and  Mar 21, 2016 Will this programmer recalibrate my speedo as I have bigger tires on This is also confirmed as a fit for your 2015 Chevy Silverado 2500 with a  Since I increased tire size to 275 60-R20 my speedometer reads approximately Ram and Wranglers have the options to add larger tires. Order this Superchips Flashcal for your 1999-2018 Chevrolet Silverado 1500 or GMC Sierra 1500 from CJ Pony Parts. 5 into the gear/tire calculator and committed to the changes. Recalibrating is for adjusting for different size tires or different gears in the rear differential. A good shop that specializes in speedometer and instrument repair is your best source of information in your quest to solve the calibration problem. It came with P255/75R17 tires which are larger than the original tires which were P225/75R16. This amazing device takes all the guesswork out of setting your speedometer to give an accurate read-out after installing larger tires. One Ram dealers tech said a Recalibrate For Larger Tires: The Hypertech Speedometer Calibrator allows owners to recalibrate their speedometer and odometer to correctly work with up to 54" tires. For example, if your speedometer says 35 miles per hour on 20-inch diameter tires, changing to 23-inch diameter tires will make your true speed 40. To instantly dial-in your speedometer and odometer, the Hypertech Speedometer Calibrator plugs into your OBD-II port, or the in-line module connects right to your instrument cluster. In just a couple of minutes you are set and the process can be reversed if needed. Nitro Gear & Axle strives to provide the highest quality differential components available. Both my rig's speedometers are off, the 4Runner is about 5-6% slow, my VW is about 10% fast (larger than stock tires), and its pretty easy to get used to it. Changing the stock parts, including the vehicle's tires, can throw off the speedometer calibration; larger tires cause the speedometer to read a speed slower than the vehicle's actual speed while smaller tires cause the speedometer to read a speed faster than the vehicle's actual speed. $65 for 1/2 hour labor to do the tweak. Made an appointment with the dealership to recalibrate my speedo after putting bigger tires on my 2014 Sierra. When you upgrade your Chevy with performance tires or non-stock gearing, choose a premium speedometer calibrator to ensure your speedometer's accuracy. A question on tire sizes and speedometer calibration. 25 mph, even though your speedometer will still show 35 mph. With wider tires, taller wheels and lower rear gears, the change is dramatic. Between going from 3. I run 35s on my '02 F-150, and when my I just called the dealer where I bought my JLU Sahara. The speedo reads 42 when I am doing 40 by GPS. Yes, the Edge Programmer CS2 # EP85350 that you referenced will allow you to calibrate the speedometer of your truck with larger tires so that it would be correct. Unless driven gears with more than 45 teeth, and/or drive gears with fewer than 15 teeth become available, it will be impossible to have an accurate speedometer with rearend gear ratios lower (higher numerically) than 3. Need help choosing the right product for your vehicle? Our team of highly trained experts has the knowledge and passion to help. Larger tires cause the speedometer to show slower speeds than reality, and smaller tires show faster speeds. (adjusted BDGT speedometer for tire size at +4%) confirmed the accuracy of speed display with GPS, and a CHP speed trap when I was cruise control at 75mph I am look for information on how to calibrate the speedometer on my expy when I get my new tires next week. When I had a Chevy pickup I used the Hypertech to recalibrate the speedometer for larger tires. . These numbers are the number of revolutions the speedometer cable must turn in one mile of travel. Recalibrate Speedometer: Can I recalibrate a Speedometer on a 2011 Chevy 1500 Pick Up for Different size tires? The Local Chevy Dealer wants $800 for recalibrate! Put the finishing touch on your lifted vehicle with Rough Country’s Speedometer Calibration Device! This easy-to-use Speedometer Calibrator helps you quickly and easily reprogram your vehicle’s speedometer to match the output of your larger tires. I've seen a lot of different information on whether or not I need to re-calibrate my speedometer for this change. I’ve seen many people frustrated because they took the time to do a thorough job rebuilding a used Muncie, but later, after the transmission is installed, they find out that the speedometer is reading incorrectly. THE BEST IN CUSTOMER SUPPORT. I have a 2016 1500 Z71 and I'm upgrading my wheels and tires. Changing tire size is one of the most common things car owners do that can affect speedometer accuracy. AEV's pro cal is not available to purchase unless you buy their lift. First time poster, long time reader here. 27 mph. Read About Mechanical Speedometer Calibration - Rod And Custom Magazine I have a 1994 chevy z71, and it now has 31×10. Another Option available from Classic Instruments is their new, award winning, SkyDrive Unit. Therefore your actual speed is higher than your speedometer If you've ever modified a car with smaller or larger tires or, perhaps, a different final-drive gear, you've immediately screwed up your speedometer. You may recalibrate a speedometer in a few simple steps. Looks amazing. Hi Chris, I'm suspecting actually your speedometer is bad or there's another undiagnosed problem in the circuit. Fred S, Millville, N. I was quoted $96. Wiring harness modifications required. Thanks! 2016 CCSB Z71 Duramax / Eibach Pro Truck Kit on Stock Setting, Springs give 2" in the front, Icon 1" blocks in the back, Continental Contact Terrain A/T 265/70/17 If you drive your hot rod, even once in a while, then you depend on all of your gauges to be reliable and accurate. I had changed the tires on my '09 Chevy 2500hd diesel truck when it was brand new for larger tires. I asked how much it costs to adjust the speedometer to compensate for larger tires. I recently just added a 6 in lift kit and 35 in tires. Large gear is the driven gear (38 tooth) for my GM Turbo 400 transmission. I put 32. Best Answer: most of the time the speedometer will do it because it only turns as fast as the axle will turn,so it should re-calibrate its self,the older ones wouldn't,but the newer ones go by the speed of the axle,so it may read right,if it doesn't the dealer can do this for you,good luck. . Like it read 140kph when I was actually only going 100Kilometers per hour. Since I increased tire size to 275 60-R20 my speedometer reads  Oct 20, 2015 This is a discussion on How to recalibrate speedo for larger tires within the RAM 1500 Diesel Wheels and Tires forums, part of the RAM 1500 . Re: Calibrate for lager tires through the NAV? So shall i conclude that there is no way to recalibrate the speedometer? I know it is totally electronic so it is not like changing a small plastic grear in an old Chevy. I went to another dealership and I was told they could only recalibrate for "GM approved tire sizes". What is the proper way to correct my speedometer/odometer for the larger tire diameter? (now have factory 265/70/17). Find CHEVROLET Speedometer Recalibration Devices and get Free Shipping on Orders Over $99 at Summit Racing! The speed sensor for the speedometer is on the transmission for the S2000, so we’ll need access to it. All of our Speedometer Calibrators are guaranteed to fit if you use enter your Chevy K1500 Suburban into your Year Make Model selector. If you’ve installed tires that are larger or smaller than original equipment tires, or if you have installed a ring and pinion gear set with a different rear gear ratio, the Speedometer Calibrator allows you to correct speedometer and odometer readings. 0. The Superlift claims it corrects all problems associated with larger tires. 42 gears and the stock 16" tires to much larger, newer 17" from a One thing to keep in mind is that the speedometer gear housing moves around like a cam, in that as you rotate the housing it moves the speedometer gear either closer to or further away from the pinion gear underneath. 00 before they figured out they could'nt calibrate to my over-sized tires. This was much easier than I expected. Recalibrate for Gearing: The Hypertech Speedometer Calibrator allows users to correct speedometer and odometer readings to work with non-stock rear end gears. Calculate the effect of tire size on vehicle odometer readings. Anyhow nobody seems to be able to adjust for tire size. My issue is that I have at least twice (one before and one after) had the SES light pop on and when I pull the code it's code 68 trans Tire Size and Speedometer Accuracy . If I don't correct it (or even after I do), will I experience any odd computer/electrical side affects besides the speedo/odo being a little off? How do you recalibrate the speedometer for larger tire size on 99 Ford F150 lariat 4x4 currently running 35's and I know - Answered by a verified Ford Mechanic Chevy TH350s could have come with two subtly different tooth-end diameters: 0. J. 4 (i called), not sure about 2016's my guess is negative. will still be not be calibrated for the new tires. When you put different size tires on your vehicle, your speedometer will no longer read the correct speed. Thus, with each revolution you are traveling further than before. cause of this i don't know exactly how fast im am going, and because its my daily driver i would like to fix this issue. 5 and the tires are P265/65R/18. That car came with either P215/75R14 or P205/75R15 tires. since the larger tires have been How to adjust speedometer for larger tires? Discussion in '1st Gen. Shop online or Call 800-544-8778 to order today. You can reprogram a vehicle when changing tire size using an on-board diagnostics system, or OBDII. Once underneath the car, unplug the sensor from the transmission, and plug in the new harness. Speedometer Calibrator Programmer Features Hypertech's Speedometer If you've installed tires that are larger or smaller than original equipment tires, or if you If your vehicle has a new calibration not available when your Speedometer   Well, two dealers and two local garages cannot calibrate the speedometer. If they didn't, I could see this being a serious liability/legal issue related to speedometer and odometer accuracy. But, if a car is modified, its speedometer may need to be recalibrated. I just leveled and put some larger tires on my Canyon. that is a stock tire size. The previous owner elected to install 235/85R16 tires on it. This provides accurate speed & mileage readings when driving a vehicle with non-stock tires and/or new gear ratios. $125 for the "contract" with Chrysler to buy the software. Is there an easy and inexpensive fix to re-calibrate my speedometer so everything is correct based on the present tire size? Thanks. So this sound like it only corrects the speedometer and nothing else, so things like shift points, abs system, etc. 5 inch tall tires. 75:1 – unless 27-inch or larger tires are installed. 84-inch drive gears, while the slightly larger 0. Well, two dealers and two local garages cannot calibrate the speedometer. Formula for Calculating Speedometer Gears. When I got there I was told that after 2006 you can not recalibrate for bigger tires. No more false mileage added to your tumblers which affects resale value. Your speedometer may or may not show a number. Im in the same boat, waiting to put on a set of 35's on my 17 Had all this ordered along with my original pcm I got 2 years ago. Features This brings up a question in my mind. Eliminates expensive and time consuming removal or disassembly of transmission simply for the purpose of changing speedometer-related parts. This is, of course, annoying, but for modern I own a Fleetwood Southwind Storm with a Chevy P30 chassis and 454 TBI w/4L80E trans. 56 Nitro Gear Package. Simply follow the on-screen prompts and in just a few short minutes your speedometer will read true again! diablo sport predator 2 for gmc/chevy gas trucks *new* *** TUNING FOR 99-17 Silverado, Sierra *** Whether you have a Chevy Silverado or GMC Yukon or something in between, the Predator is going to ramp up the performance on your truck in a big way! Upgrading to larger wheels and tires is a big change for your truck's other components. I just drive the VW one mark under the speed limit, so on a 65 road, I run at 60 indicated. The original size tires from factory were 7. If you are planning on, or have already replaced your original equipment tires with a different tire size, it is important to remember that changing your tire size can affect the accuracy of your speedometer. Twelve speedometer driven gears are available for the 700R4 / 4L60 transmissions to calibrate the speedometer with various axle ratios and tire diameters. Ford/Chevy/Dodge dealers frequently reprogram the vehicles for larger aftermarket tire/wheel packages. Parts VCDS cable and software from ross tech GPS I'm upgrading to a 20x9 wheel and a 33" tire. Recalibrate your vehicle's speedometer instantly and easily with the Rough Country Speedometer Calibrator. I replaced my 29. 50Rx16XPS 16in rims. If you are running larger tires, then your percentage change will be a positive number, meaning your speedometer will read higher than your actual speed. It was an upgrade to new alloy wheels with thin performance tires. When you go to larger tires your speedometer will be inaccurate because taller tire have large outer diameter. Giving this a bump to see if anyone has found a nice way to adjust the speedometer/odometer for larger tires. Q: Three months ago I purchased 2010 Jeep Wrangler Sport. How to Repair a GM Speedometer: Do you drive a GM car (200 and up) and have gone past 70-80 thousand miles only to have your gauges (speedo, temp, and fuel) go out on you? Don't want to pay the $500 (more/less) that the dealer or shop will charge you? then read on and save a few Put the finishing touch on your lifted vehicle with Rough Country's Speedometer Calibration Device! This easy-to-use Speedometer Calibrator helps you quickly and easily reprogram your vehicles speedom If the car doesn't have the same size tires that it came with from the factory, the speedometer will be off. Tire size is entered correctly (I saw it with my own eyes) but the odometer is reading distance too fast (i. A taller outer diameter tire will travel farther per revolution than a smaller tire. 83 to 3. Anyone have any ideas on how to store my full size spare? Is there a trunk mod to get a 235/70r17 in the trunk? The white diamond-shaped socket is where I just removed the speedometer from a 1988 unit; the row of green devices just to the right of the socket are "micro-fuses" that the factory selectively blows out in order to calibrate the speedometer. My stock wheels are the 18x8. Was wondering if I got 265/65/17 size tires if I would need to get it reprogrammed for the larger tires? I'm not sure if they calibrate it for the speedometer or not. com FREE DELIVERY possible on eligible purchases Hypertech's plug-in calibrator properly tunes speedometer and odometer settings. However, so is the change in the speedometer calibration. Chevy Truck Forum | GM Truck Club Re-calibrate speedometer. I went back and forth several times until I found the right value to accurately calibrate my speedometer to the bigger tires, but now even if I change the values back to stock the warning won't go away. When you go to bigger tires the circumference of the tires is larger, meaning the distance around the tire is longer. My speedometer reads about 3 mph faster Tire Change / Speedometer Change Calculator July 12, 2016 Roadkill Customs Technical Info This calculator is designed to give information related to tire size changes and the general impact they have on the calibration of a speedometer. Can anyone tell me how to recalibrate the speedometer for the larger tires? Dealership can now reprogram / calibrate speedometer and odometer for bigger tires and after with a speedometer app. Once installed, rocker switches allow for future changes with no down time. There’s never been an easier or more affordable way to calibrate the speedometer in your 2007-2016 GM 1500 2WD/4WD pickup or SUV than Rough Country’s QuickCal Speedometer Calibration Device. It adjusts your speedometer for bigger tires or gear Find Speedometer Recalibration Devices and get Free Shipping on Orders Over $99 at Summit Racing! Wheels & Tires; More Ways To Shop. Thanks i think this will help a  This speedometer error is due mainly to variations in tire diameter, tire wear, tire Vehicle manufacturers usually calibrate speedometers to read high by an amount . Select your vehicle from our vehicle finder to get specific horsepower gains for your vehicle. 3" . I was wondering if the dealer could recalibrate the spedometer so I don't have to use an after  Use our speedometer calibration calculator to compare how fast you are traveling and When you go to bigger tires the circumference of the tires is larger, meaning the distance Speedometer Calibration Tire Size Chart for 13" Wheels Bentley, BMW, Buick, Cadillac, Chevrolet, Chrysler, Datsun, Dodge, Eagle, Ferrari  This should be done when gearing ratio or tire sizes are changed to keep -A slightly larger 265/75R16 will have a rolling circumference of 99. This is because larger tires cover more ground in one complete revolution. I have called 3 dealers local to me and they all say you cannot change this. Larger diameter tires will cause real speed to be faster than what is displayed, My 35" tires are pretty much 55 on dash / 57 real speed, 65 dash / 68 real , 75 dash / 79 real, etc. The speedo reads 42  Recalibrate For Larger Tires: The Hypertech Speedometer Calibrator allows owners to recalibrate their speedometer and odometer to correctly work with up to  Jan 29, 2011 Any info on what controls the speedometer and how to calibrate it for larger tires. Consider the example below. I calculated a 6 mph difference. Any information would be greatly appreciated. Tacomas (1995-2004) calibrate next to a GPS or something. The diameter of the tire will have an impact on the speed shown on the speedometer and therefore impact the speedometer repair as well. We provide incredibly reasonable prices on quality parts. jandrews, May 31, 2010 #2. 90:1 - unless 28-inch or larger tires are installed. This way both your speedometer and odometer would be correct for the most common driving speeds - if you move the speedometer needle you're moving it a fixed number instead of a percent. Most speedometer from 1965 on use 1000. Since I increased tire size to 275 60-R20 my speedometer reads approximately 3 mph faster than stated on speedometer. and what's on the car now are 245/45ZR17 tires. Im going to put 35×12. I was wondering if the dealer could recalibrate the spedometer so I dont have to use an after market tuner and ruin the warranty I payed extra for on the computers. Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. Compared to smaller diameter tires, the larger tires will travel greater distances in the same time. Your vehicle's computer is designed to track the speed based on your stock tire height. The stock speedometer is calibrated at the factory to accurately measure mileage and speed using the stock tires and gears that came in your car. Cars today don't simply have a "speedometer sensor". The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line. To correct this, you can have your speedometer recalibrated. If you’ve installed tires that are larger or smaller than original equipment tires, or if you have installed a ring and pinion gear set with a different rear gear ratio, the Speedometer Calibrator allows you to re-program for correct speedometer and odometer readings, as well as correct part-throttle shifting. They serve the same purpose as the hardwired jumpers in the 1992-1995 unit. We've got a wide rang of top-quality Chevy K1500 Suburban Speedometer Calibrator of all the best brands in the industry at an affordable rate. Has anybody found a successful way to calibrate after installing bigger tires without a DTC? Speedometer ratio adjustment calculator. I can tell that this has changed the accuracy of my speedometer because it is registering a different speed than my GPS does. The slower you went the less it was off. I only went from 28" tires to 33" tires but with the gear change my old speedometer was way off. Runs great and everything, but had no change in mpg. Matter of fact, jeeps for example, which uses the same set up as your car, uses the wheel speed sensor for the ABS, as the actual VSS, not the two on the transmission. if anyone knows how to fix it, the help would be GREATLY appreciated! This calculator gives the user a general idea of wheel effects. Electronically adjusts speedometer for rear end gear changes. Actually 2. how to calibrate speedometer for larger tires chevy

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