Noob axle question -
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post #1 of 3 Old 12-02-2013, 02:47 PM Thread Starter
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1987 YJ Wrangler 
Join Date: Feb 2013
Location: Staten Island
Posts: 65
Noob axle question

Hey all..

I've had my yj about a year and was looking to put in a new rear. I don't know what gear ratio i currently have though. I have an 88 4.2L I6 engine with the AX-15 tranny and NP231 transfer. currently running 33x12.5 tires and can get into 5th gear while driving most of the time and stay at a steady rpm. any idea how to find out my gearing/locker set up?


Staten Island, NYC
87YJ 4.2L 5 spd with some cool stuff done to it.
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post #2 of 3 Old 12-02-2013, 03:22 PM
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1993 YJ Wrangler 
Join Date: Jan 2009
Location: East Bay, CA
Posts: 354
I mean, the stock set up is 3.07 gearing with an open differential yeah?
If you need confirmation then open it up!
seeing as you want a new rear, I'd only open the front,
as the old rear gearing doesn't really matter, as it's going to be replaced.

when you crack it open it'll look like this-

well close....
this is a 35, the rear, with 4.10 gearing.
so on yours spin the ring gear until you can see the last numbers (mine is 37/9)
divide (36 goes into nine four times with 1/9 remaining, which is 4.1 with a repeating decimal, the closest ratio to that is 4.10)
should be 3.07
then look at your differential,
if it looks like this:

it's open.
if not, then describe or take a picture, then we can tell you what it is, if you don't recognize it.

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post #3 of 3 Old 12-02-2013, 04:25 PM
Joe Dillard
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1991 YJ Wrangler 
Join Date: May 2004
Location: Patuxent River
Posts: 14,595
Answer is in the Frequently Asked Questions (FAQ) sticky thread, in the stock specs area.
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dana 35 , gear ratio , help needed , locker , noob

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