2007 Jeep Wrangler JK Build-Up 2007 Jeep Wrangler goes from Mild to Wild

Finding the Right Gear Ratio

Regearing your JK will be beneficial once it is lifted with some bigger meats. Here are our recommendations for a ratio:

stock-33″ Tires: 4.10 (stock)
35″ Tires: 4.56
37-38″ Tires: 4.88
40″ Tires: 5.13

These ratios will keep you close to the same RPMs as a stock JK with 32 inch tires and 4.10 gears. We know that not all JKs come with that combination, but many do come with something close to that and it works well. Also, you will usually want to gear a little aggressive to help make up for the extra rotational mass of larger tires.

See the cart below (courtesy of Superlift):

Note: RPMs may not reflect your actual RPMs due to different transmission gearing.