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Old 02-03-2009, 02:20 PM   #1
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Question question about regearing

I have a 2006 TJ w/ 4.0l and auto trans w/ OD.
I am looking at doing a 4 inch lift and adding a D44 front and rear both with air lockers. For now I will probably stick with my 31*10.5*15 till I need new tires. Then I will change to 33*12.5*15 or 35*15.5*15
My question is what gear ratio should I run keeping in mind this is my dd. I was thinking 4.88. But will I get more torque from a higher or lower ratio.

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Old 02-03-2009, 02:49 PM   #2
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This is an excellent tool to help you out.

Gear Ratio Calculator

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Old 02-03-2009, 04:07 PM   #3
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this does not help as they do not list my transmission. I have a 42RLE.
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Old 02-03-2009, 04:25 PM   #4
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Try this one. Use all the same numbers except your tire size and gear ratio. Use 1:1 for tranny and t-case.

4Lo.com :: Final Gear Ratio, Crawl Ratio, Tire Size Calculators
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Old 02-03-2009, 08:44 PM   #5
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I have a 2003 with the 42RLE transmission also. I run 33's with 4.56 gears. The regear is great and brings power back to stock levels. The 42RLE has about a 30% overdrive and so most gear charts don't aply to it. Here is the standard opinion on gearing for it if you want to keep it as a double duty able to go at 75 MPH down the freeway at about 3000RPM.

31" tires= 4.10 gears
33" tires= 4.56 gears
35" tires=4.88 gears
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Old 02-03-2009, 08:55 PM   #6
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Quote:
Originally Posted by Joe Dirt View Post
I have a 2003 with the 42RLE transmission also. I run 33's with 4.56 gears. The regear is great and brings power back to stock levels. The 42RLE has about a 30% overdrive and so most gear charts don't aply to it. Here is the standard opinion on gearing for it if you want to keep it as a double duty able to go at 75 MPH down the freeway at about 3000RPM.

31" tires= 4.10 gears
33" tires= 4.56 gears
35" tires=4.88 gears
i can go along with that.

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