to see what kind of performance to expect from different combinations. When you change tires on your Jeep from the stock size to the larger tires to give your lifted Jeep the look you want, a change in gear ratio is necessary to give you the optimum power ratio. Gear Ratio Calculator | Introdution to differentials and lockers | The basics of gears and why you would want to change them | Information on donations | Home. grimmjeeper@gmail.com See the Gear Ratio calculator in the Spicer Tool Kit to determine your ratio. Use the RPM calculator to determine what RPM your engine will run based on gear ratio, tire diameter, transmission and MPH. Welcome to Alloy USA - 10 Year Axle Warranty - 5 Year Ring & Pinion Warranty, Here's a formula you can use to calculate your vehicle's tire diameter: within operating ranges of the vehicle. Over 130 Crawl Ratio – Excessive with little to no additional benefit You can try various combinations to come up with an appropriate combination of ring and pinion gear ratio and tire diameter for your vehicle. Step 1: Select transmission from the drop down list or, if it's not in the list and you know 5.1: LJ or TJ Shift Linkage 5.2: Jeep Wrangler Undercoating 5.3: Stuck Oil Filler Cap 5.4: Grease Maintenance 5.7: Oil Change 5.8: Oil Pressure Sending Unit Enter Shift at RPM, select gear to shift to and hit Shift and Trace to run up through the gears recording shift point RPM and km/h. Exact results of 4.1: Jeep Wrangler Unlimited 4.3: Jeep Wrangler TJ Wrangler Repairs. The chart lists the gear ratio and tire diameter to easily guide your purchase into the correct size application. Introdution to differentials and lockers | The following chart lists the RPMs your engine will be turning while driving at a given speed. The following chart lists the final drive ratio of all combined gears (transmission, This calculator is useful for planning your rig, allowing you My original purpose in making this website was to have a permanent home for my gear ratio calculator.I chose the name based on my last name and my love for classic Jeeps. See also: Printable Full Scale Degree Wheels Dial in your cam - and Printable Timing - Degree Tape Enter Diff + Gear Ratios and Tire Diameter, then drag RPM slider to calculate speed from RPM. transfer case, underdrive, axle) in all possible combinations. This calculator will give you the gear ratio, just plug in the numbers. Note: This calculator is continually being updated. $489.99 $469.95. Some of the possible ratios include 3.07, 3.55, 3.73, and 4.10. From experience and friends it seems that 4.56 is a good manual final axle ratio, and 5.38 (07-11) or 5.13 (12-up) for the Automatics on 35's, 37's and up require a ratio bump in the same direction. Or clear them entirely Using 3.73 gear ratio yielded 52 mph at 2000 rpms and 3.07 yielded 63 mph at 2000 rpms. The lists of available equipment will (CROSS SECTION WIDTH x 0.ASPECT RATIO x 2 ÷ 25.4) + WHEEL DIAMETER = OVERALL TIRE DIAMETER The basics of gears and why you would want to change them. For Example: 235/45ZR-1 (235 x 0.45 x 2 ÷ 25.4) + 17 = 25.327" SAE The question is, "What is your speed now at 2000 rpms?" You must have JavaScript enabled in your browser to utilize the functionality of this website. The following chart lists the road speed you will be going while the engine is at a given RPM. My Jeep site. You know the tire height in inches. I used this calculator, and used a tire size of 32.5, since most 33 inch tires are actually smaller, and came up with 47 mph with 4.10s at 2000 rpms. 2.1: Jeep JK Lift Pics 2.3: Jeep TJ Lift Pics 2.4: Jeep LJ Lift Pics 2.5: Jeep YJ Lift Pics 2.6: Jeep CJ Pics Wrangler Info. and I will do my best to include it as quickly as possible. RING GEAR TOOTH COUNT ÷ PINION GEAR TOOTH COUNT = GEAR RATIO The T176 does not have a compound low gear but does have all around good gearing ratios of: 1st gear 3.52:1; 2nd gear 2.29:1, 3rd Gear 1.46:1; 4° Gear 1.00:1; Reverse 3.52:1 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. Save the entries in the form for when you come back later If your tires are bigger than stock you probably, like myself, have spend a lot of time trying to WAG (wild ass guess) your actual MPH when going down the road. Ring / Pinion - Gear Ratio: Okay, so you've torn your pumpkin apart and have the ring gear and pinion gear teeth count. Engine RPM Calculator Enter your axle gear ratio, tire diameter, vehicle speed, and transmission gear ratio in the blue fields and click the calculate button to find your engine RPM. Solve for your Crawl 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). This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. Information on donations | Step 2: Select transfer case from the drop down list or, if it's not in the list and you know the gear ratios of your Also calculated is the new gearing you would need in order to return back to your original gear ratio when going to a bigger or smaller tire. Jeep JT 1310 Driveshafts. Drag Max RPM slider to adjust the range of the RPM and km/h Gauges. For example: 41-tooth ring gear ÷ 10-tooth pinion gear = 4.10. send the information to me at Just type in your info (example: 5000 RPM), press calculate, and you’ll get the right ratio without the guesswork. Here is a chart that shows optimal gear ratios for lifted Jeeps with larger tires. the gear ratios of your transmission, enter them below. Nothing you do is tracked on the grimmjeeper server. For a 3.21 gear your driveshaft would turn 3.21 times for every one rotation of your wheel. You can also follow this site on The Ultimate Crawl Ratio Calculator. Gear Ratio Calculator. Solve for your Transmission Ratio. A good way to calculate this is to multiply .12 by your Jeeps tire diameter (Example: .12 X 38" = 4.56). If you have a Rubicon you have a NV241 t-case and a 4:1 crawl ratio. Facebook. Input your stock and new tires sizes along with your original gear ratio. Solve for your Transfer Case Ratio. Gear ratios: 3.55 (97 only), 3.73 Trac-Lok limited slip differential on early models, optional on later models WMS to WMS: 60.5″ 5 on 4.5″ bolt pattern Steel fill plug 2003-2006 – Dana 44 216mm; Rubicon Front Axle Gear ratio: 4.10 Tru-Lok selectable pneumatic locker, open when unlocked WMS to WMS: 60.5″ *Standard WW2 jeep features ^ Standard WW2 jeep tire diameter – 6.00×16 # Non-standard option, if no OD leave blank or select “normal” This calculator is based on the work of Richard Grover, see Willys Utility Vehicle Speed Calculator for calculator on post-war jeeps. 1. This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs within operating ranges of the vehicle. Gear ratios are based on how many rotations your driveshaft needs to complete to turn your wheels once. Chrysler Group LLC. probably never be complete. 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. Rough Trail Sye Kit and Heavy Duty 1310 CV Driveshaft Package. Note that this will store the data locally on your computer. There is a direct correlation between tire size and the gear ratio. Ian shows you how to find the effective gear ratio on your vehicle when you upgrade to bigger tires with this equation on a PowerNation Extra tech tip. The transmission is well engineered and features all helically cut gears. Gear Ratio; Tire Size; Metric Tire; Ramp Travel; Ring and Pinion; Speedometer; Liters to Cubic Inches; Dyno; Gear Ratio Chart; Blood Alcohol Content; Garage. Jeep JT Front CV 1350 Driveshafts; Jeep JT Rear 1 Piece CV 1350 Driveshaft ; ... Gear Ratio Chart. Jeep® is a registered trademark of of Use our gear ratio calculator to find the effective gear ratio your vehicle will have with a new tire size. combining equipment may vary from the estimates provided in this form. When ever you change tire size from the original size to another there will be a direct effect on power and drivability. Home; Wrangler Lift Pics. The data provided here is done A good way to calculate this is to multiply.12 by your Jeeps tire diameter (Example:.12 X 38" = 4.56). Jeep JT Front CV 1310 Driveshafts; Jeep JT 1350 Driveshafts. Home. The stock gear ratio tends to vary depending on the year and package your Jeep has. In addition to the tires and gears, you can adjust the engine RPM to find your ultimate crawl ratio, or a balanced blend of on-road and off-road performance. Crawl speed The tooth count ratio of 43/8 means 43 teeth on the ring gear and 8 teeth on the pinion gear. You can get away with a lower gear ratio and still crawl slower than your friends with 2.71:1. JavaScript seems to be disabled in your browser. Choose between SAE (feet/miles) and Metric (meters/kilometers) View the results of endless combinations of transmissions, transfer cases, axles, and tire size combinations. Crawl Ratio = Transmission Low Gear x Transfer Case Low x Differential Ratio i.e., 6.68 x 2.46 x 4.88 = 80.2 RPM = (mph x transmission gear ratio x axle gear ratio x 336) / tire diameter i.e., (65 x 1 x 4.11 x 336) / 33 = 2720 rpm Wranglers that are equipped with the Rubicon package typically come with the 4.10 gear set in their Dana 44 axles. This has a very big effect when you are wheeling in 4-low! Enter your new tire diameter, your old tire diameter and your present gear ratio to find out your new gear ratio Convert P-Metric Tire to Tire Diameter Inches Convert the funky P-Metric Tire # (Example: 195/75R15) on the side of your tires to Inches, so you can use more of these rearend calculators! If you know your gear ratio and tire size you can get a fairly close idea here. If your TJ is not a Rubicon you will have a NV231 t-case and 2.71:1 crawl ratio. so as-is with no warranty expressed or implied. Ring-and-pinion selection made easy! Calculators. This form allows you to calculate final drive ratios as well as see a comparison of speeds and RPMs If we divide 43 by 8 we get 5.375, which is usually rounded to 5.38. transfer case, enter them below. My charts are not the gospel on gear ratio's, but will give you a decent idea. The basics of gears and why you would want to change them | We have developed this chart to help you select the optimum gear ratio to put your performance back where you want it. The following chart lists the crawl speed you will be going while the engine is at a given RPM. Using the chart below, first determine your original gear ratio and tire size and follow to the intersection that should be your approximate RPM at 65 MPH. Current Top Sellers. 3-speed manual transmission in 3rd gear; 5-speed (or higher) manual transmission in the last gear; The ratios used for the transmissions are 0.70 for the automatic and 0.80 for the manual; You know the ring gear and pinion gear ratio. Gear Ratio Chart JEEPHUT 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. And here's a formula that you can use to calculate your vehicle's rear axle gear ratio: 50-60s Crawl Ratio – Backroads and light trail use; 80s Crawl Ratio – Intermediate trail use; 110-130s Crawl Ratio – Ideal for crawling, it allows taking obstacles at a slow, controlled speed without riding the brakes or applying constant throttle to avoid stalling. Disclaimer: This form is only to be used for estimation purposes. Gear Ratio and Tire Size Calculator - 4x4 and Jeep Ring & Pinion When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! A good way to calculate this is to multiply.12 by your Jeeps tire diameter (Example:.12 X 38" = 4.56). 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. 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