• 3.21 OEM gear ratio (3.73, 4.10 optional ratios). In 2007, the Jeep JKU had a … Hummer H3. Gear Ratio Chart. This calculator will give you the gear ratio, just plug in the numbers. As an example, if there are 41 teeth on the ring gear and 10 teeth on the pinion gear, you would have 41/10 = 4.10, giving you the 4.10 ratio. A good way to calculate this is to multiply .12 by your Jeeps tire diameter (Example: .12 X 38" = 4.56). Both the Jeep Wrangler JK and JK Unlimited were launched from 2007-2018. This calculation is used to match oversize tires with new ring and pinion gears to obtain the desired engine RPM at highway speed. Jeep Wrangler JKU Towing Capacity Guide - Know your vehicle before you tow with it. If you are regearing your Jeep Wrangler you will want to determine the best gear ratio to use. So why change the gears? 2007 Jeep Wrangler JK Jeep Wrangler JK Specs. Gear Ratio Calculator Go there and enter you numbers to see where you would wind up. If your TJ is not a Rubicon you will have a NV231 t-case and 2.71:1 crawl ratio. 4) Real world vs. math. The ratio is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear. In 2013 the 3.21 gear ratio axles Wranglers get a bump up to 2,000lbs weight and 200lbs tongue capacity. Okay, so you've torn your pumpkin apart and have the ring gear and pinion gear teeth count. A good way to calculate this is to multiply .12 by your Jeeps tire diameter (Example: .12 X 38" = 4.56). Here is a chart that shows optimal gear ratios for lifted Jeeps with larger tires. You can get away with a lower gear ratio and still crawl slower than your friends with 2.71:1. ‡ Requires drilling to fit 1/2" ring gear bolts.
A majority of the Jeep models have a towing capacity of 2,000lbs, while others max at 3,500lbs. • Dana 44 JK axles feature an oversize pinion gear. Think about what happens when you change the tire size. 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.
There is a direct correlation between tire size and the gear 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. Towing Capacity of Jeep Wrangler JK. There are many choices and it is hard to tell what is best when you have some people telling you one thing and others telling you something else. This is because; most of these models are classified either as 3.21 axle ratio or 3.73 axle ratio. I found different opinions on where the power was, how it was calculated, and even preceived.
• Jeep JK axles have a 5 x 5" bolt pattern
When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power.
JK Gear Ratio's . Dana 30 front axles have a 7-1/8″ diameter ring gear and come standard on Sahara and X model Jeep JK Wranglers with a gear ratio of 3.21. The calculator below will give you an idea of what your engine RPMs will be running at any combination of gears, tires, and transmission. For 2007, an optional 4.10 gear ratio was available on towing packages. Join thousands of other Jeep fans as we tackle Wrangler problems and more. Final Drive Axle Ratio (:1) under Tech Specs would be the actually ratio in the axle right? 08-27-2010, 10:50 PM #16.
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