What gears should I run with 33X12.50 tires with I-4 cyl engine in my 90 Wrangler? - Jeep Wrangler Forum
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Old 05-19-2010, 12:35 PM   #1
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What gears should I run with 33X12.50 tires with I-4 cyl engine in my 90 Wrangler?

I have a 1990 Wrangler with the inline 4 banger, 5 speed and am running 33X12.50" tires with 3" suspension lift. I believe the stock gears are 4.10s. What should I change them to? I understand they need to be something like 4.88s or something of that sort but not familiar with gears and the work involved to install. Please help!

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Old 05-19-2010, 01:05 PM   #2
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Installing gears is very difficult, and time consuming. Most people can't install them. I know how and can do it, and if I get to the point where I need new gears, I'll pay a shop to do it because it sucks that bad.

New gears are 350 per axle, give or take. Both axles get gears, so 600-700 for gears. The install takes me all day, so that's about 500 bucks labor. Look to spend $1000-1500 to get new ones.

I always suggest to folks to put the tires on. Drive it a month. Then if you don't like it, we can talk about gears. I go low as your axles will allow. 4.88 or 5.13 maybe?

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Old 05-19-2010, 01:12 PM   #3
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I have heard gearing is expensive, I am considering putting 265/75/R16s from my old truck and running those, but don't know what they would look like with a 3" lift. I love the look with the 33's, but don't want to blow my engine or tranny anytime soon.
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Old 05-19-2010, 01:19 PM   #4
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Could always look into buying new axles with the gearing you want. I don't think they made stock and lower than 4.10, but maybe you can find someone who swapped gears already.
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Old 05-19-2010, 06:08 PM   #5
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I'm running a similar set up, I've got a 4 cyl engine with 35" tires and a little more lift. My gears are currently 4.88 and it's not low enough. I talked to a Jeep guy at Aamco about going to 33X12.50" like you have and he said if I did that 4.88 would be perfect. Also, since I'm never one to just take a mechanics word for it without a little research of my own, I checked it out on a calculator. Enter your set up in here and it will give you a little idea.
Randy's Ring & Pinion. RPM Calculator.
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Old 05-19-2010, 07:55 PM   #6
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I have a 95 and 33x12.50x15 and i lost fith gear i did some checking for my jeep and was told by most everyone who wheels to go with either 4.56 or 4.88 gears that either of those will be great if you go with 4.56 its closer to factory rating and for a littel more power you would go with a 4.88 myself personaly i'm going with 4.88

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