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OK, we got this 85 CJ last month (35,000 original miles), it is stock as stock can be, but good shape & a good deal. Anyway, it has really wimpy (205) tires on it (inside the glove box it says the recommended tires are 225). We have a set of 31" BFG's that we are going to put on it. I recently found out that it has 2.78 gears in the rear (as opposed to our '78 that had 3.27 as the stock). We want to do a ring & pinion swap for lower gearing. Any recommendations as to whose & what gears (I know I can figure this out on my own through formulas, but thought I'd get the mass opinion). I would eventually like to put a 32" tires on it after the 31's run dead & I get a mild suspension lift. Also, I know I need a 1 piece axle, that is also coming. /wwwthreads_images/icons/laugh.gif
 

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If you plan on 32's then I would suggest a gear of 3.73. There are plenty of quality gear manufacturer's. Most gears now are of a good quality so you can just about buy from anyone, but dont' quote me on that!

Alec (3.73's with 33's and a little under geared...I think!)

 
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Alec,
I just ordered my 1 piece Superior axles and the ARB for my AMC20 (ouch on the credit card)...I was just getting ready to order gears.....I was planning on 4.11's but based on your statement I thought I would double check. Currently my 84CJ has the 3.31 gears (I counted drive shaft turns to confirm it) and 32" BFG's....I also have the T5 which has the overdrive...is 4.11 going to be too much or would 3.73 be better? I only want to do this once......oh...and she is a daily driver.

John......southern CA
84CJ7,3"lift,32"BFG
 

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i'd say for a 1:1 high gear transmission, use 3.73:1, for an overdrive transmission, the 4.11:1 should work fine.

 
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