Question about 1990 Jeep Wrangler

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I want to replace the rear diferential gears on my 1990 jeep wrangler how do I get the ratio

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The diff ratios for the Wrangler were:-

Axle 4.11 (a); 3.07 std., 3.55 opt. (b)

Posted on Mar 20, 2011

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  • Jeep Master
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There is usually a tag on the rear cover with the ratio stamped on it. If the tag has been lost you count the number of teeth on the ring gear and divide that by the number of teeth on the pinion. That number is the ratio, expressed as (your number:1) example: 3.73:1. Ive seen some ring gears that have the ratio stamped on the edge. Won't hurt to see if yours is.
Remember...the rear gear ratio needs to match what you have at the front or you will destroy the transfer case. It's also better to replace the entire differential drum to drum as setting up a gear set is a precision job that can get expensive, especially if done incorrectly.
Whatever you do, don't forget to fill it with lube when finished!!!!
Good luck!

Posted on Mar 20, 2011

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