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Discussion Starter · #1 ·
Im looking at a used JK on a lot. It has a mopar lift with 35" tires on it. It drives like it has been regeared but I cant tell for sure. Based on the picture, it looks like maybe someone has been inside the unit. Thoughts?
 

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You can't look at the pumpkin and know...

Count the revs of the driveshaft for one full revolution of a tire.
 

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So just trying to understand...

A 4.10 gearing means 4 driveshaft revolutions per one tire rotation, regardless of tire size?
 

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It's 4.1:1; so 4.1 driveshaft revolutions per one tire rotation and 3.73:1 means 3.73 driveshaft revolutions per one tire rotation
 

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So just trying to understand...

A 4.10 gearing means 4 driveshaft revolutions per one tire rotation, regardless of tire size?
Yep.

3.21 = about 3-1/4
3.73 = about 3-3/4
4.10 = a little more than 4
4.56 = about 4-1/2
4.88 = a little more than 4-3/4
5.13 = not quite 5-1/4
5.38 = between 5-1/4 and 5-1/2

And keep in mind that if you lift only one tire, the number of driveshaft revolutions will be 1/2 what they would if both tires were turning together. This is because of the action of the differential with one tire not turning.
 
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