Help with gear ratios. - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > CJ Jeep Forum > CJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 08-04-2014, 11:27 PM
Thread Starter
Join Date: Aug 2014
Posts: 7
Help with gear ratios.

Am new to the jeep wrangler scene. I purchased a 87 wrangler with a 6cyl swap from an 89 cherokee.

the jeep was originally 2.4 4cyl

the transmission is 5 sp manual believed out of the 89 cherokee that the engine came out of

am trying to identify the rear gear ratio. I jacked up the rear end and marked the tire and the drive shaft. When i turn the tire ten times the drive shaft turns 19 and half and does not line back up.

The transfer case is 231 amc and ratio 2.72
numbers on rear diff 42968 028-8
front diff 40869 037

i want to run a 4.11 or 4.27 gear ratio as i am running 33 inch tires and its gutless at moment.

Demislayer is offline   Quote
Old 08-04-2014, 11:39 PM   #2
Cj5carlton's Avatar
Join Date: Mar 2014
Posts: 115
Are there no tags on the diff cover? Those other numbers are the axle housing #s I believe but there should be a little metal tag on the bolts of the cover. Unless someone has re geared it before.

Cj5carlton is offline   Quote
Old 08-04-2014, 11:42 PM
Thread Starter
Join Date: Aug 2014
Posts: 7
those are the numbers on the diff cover. no tags. unfortunately i have no previous info as it was a trade in for shop labor
Demislayer is offline   Quote
Sponsored Links
Old 08-18-2014, 03:50 PM   #4
shelby987's Avatar
Join Date: Dec 2013
Location: Raleigh, NC
Posts: 107
An 87 Wrangler (YJ) with a manual transmission and a 2.5l 4 cylinder would have been 4.10 gears from the factory.

The tag that carlton referred to would be a vertical strip of tin bolted to the diff cover (perpendicular to the axle tubes). Be sure to check close, once these axles get to leaking, they accumulate lots of grit and dirt, and that thin tag can disappear.
shelby987 is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 09:36 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeepģ, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC