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Unread 12-02-2012, 05:28 PM   #1
kjg26
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rear end gears

Im trying to determine my rear end gear. I raised the rear axle and rotated the tire 1 entire rotation. The rear shaft spun 1 5/8. The trans was in neutral and both rear tires were in the air.

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Unread 12-02-2012, 06:07 PM   #2
BlueRubiconrich
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You need to mark a tire and the rear drive shaft
most YJ's came with 3:07's, 3:54's and 4 cyl's came with 4:10's
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Unread 12-02-2012, 06:09 PM   #3
kjg26
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I counted whole revolutions on the tire. For one tire revolution I had 1 5/8 turn in the shaft.
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Unread 12-02-2012, 06:15 PM   #4
BlueRubiconrich
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best bet go to your Jeep dealer with your VIN theny can tell you what you Jeep came with.I can tell you you don't have 4:10 gears unless they swapped them out. Other thing to do remove rear cover count pinion gear teeth and the ring gear.
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Unread 12-02-2012, 06:25 PM   #5
Mean Max
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Raise ONE rear wheel, spin the wheel TWICE while counting driveshaft revolutions.

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Unread 12-02-2012, 07:07 PM   #6
kjg26
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Why twice?
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Unread 12-02-2012, 07:19 PM   #7
Mean Max
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Originally Posted by kjg26 View Post
Why twice?
The driveshaft drives the ring gear, the ring gear rotates the carrier, the carrier houses the differential (spider) gears that drives both of the axle shafts. Spinning only one tire twice accounts for the non-spinning tire.

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Unread 12-02-2012, 07:26 PM   #8
kjg26
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So if I got JUST over 1.5 turns of the drive shaft with one turn if the tire. I more than likely have 3.07s
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Unread 12-02-2012, 08:55 PM   #9
Mean Max
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So if I got JUST over 1.5 turns of the drive shaft with one turn if the tire. I more than likely have 3.07s
That would be my thought, based on what you did.

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