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Old 01-07-2010, 09:54 PM   #1
Join Date: Jan 2010
Posts: 6
new to wrangler forum and already picking some minds

hello all. Before I get to my question, My first vehicle i had ever owned was a 1987 wrangler 4.2. yeah, I know..... well a handfull of years later, ie last week I came upon a deal for a 2.5l 1993 wrangler. it brings me back to my highschool days, but needs some modifications first.

I am planning on running 33" tires with a 5.5" lift and a true trac locker to boot. after searching endlessly on the forum, my question remains.... can I run 4.88 gearing (or even 5:12) on the stock 4.10 diff carrier? or will i have to get a larger spool. I realize the weaknesses of the dana 35, and would only use it till it breaks ($!) any info would be great or possibly some threads to an incompetent searcher. thank you all!

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Old 01-07-2010, 10:44 PM   #2
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Join Date: Oct 2009
Location: Battle Creek, MI
Posts: 235
I have not done it personally but I know it says on quadratec. *If you run the bigger tires, you'll want these gears in your Jeep! When replacing 3.31 and numerically lower ratio gear set with a 3.55 or higher gear, the case must be changed to a 3.55 or higher case.

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Old 01-07-2010, 10:51 PM   #3
Join Date: Jan 2010
Posts: 6
I had seen that as well. the 2.5L is geared at 4.10, so that is techincally not a numerically lower gear ratio than the 3.31. so I should in fact have a 3.55 and higher
(4.10 stock gears) case assembley. I just want to be sure I have all the parts needed to complete the regearing. thanks for your response!!!
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Old 01-07-2010, 10:53 PM   #4
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Join Date: Aug 2009
Location: NY
Posts: 593
Your 4.10 carrier should be fine....I'm running 33's with 4.56 gears.. seems to be plenty of gear for me but then again your running a 4 cyl...
91 YJ, SBC V8, 5 speed, 8.8, 4" spring, SOA, 35" MT/R ............ Sadly I have sold my Jeep.
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Old 01-08-2010, 09:17 AM   #5
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Join Date: Oct 2009
Location: Waverly
Posts: 207
The problem with running anything above 4:56 gears is that the pinion gear size starts to get smaller. It then is the weak link in the system. I assume also that you still have the D30 & D35. I don't think there is anything available higher than 4:88s. My friend has an 89 with 33s & he's running 4:88s with no problem & plenty of power. Your carrier will work with either choice.
1990 YJ 4" BDS lift, shackle reversal, 33" TSLs
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