rear end gears - JeepForum.com

 
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post #1 of 9 Old 12-02-2012, 05:28 PM Thread Starter
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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post #2 of 9 Old 12-02-2012, 06:07 PM
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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post #3 of 9 Old 12-02-2012, 06:09 PM Thread Starter
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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post #4 of 9 Old 12-02-2012, 06:15 PM
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.

Rubicon Rich ,05 TJ Rubicon: PatriotJeepers.com
86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
51 M100 1/4 ton Jeep trailer
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post #5 of 9 Old 12-02-2012, 06:25 PM
Mean Max
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Raise ONE rear wheel, spin the wheel TWICE while counting driveshaft revolutions.

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post #6 of 9 Old 12-02-2012, 07:07 PM Thread Starter
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Why twice?

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post #7 of 9 Old 12-02-2012, 07:19 PM
Mean Max
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Quote:
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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post #8 of 9 Old 12-02-2012, 07:26 PM Thread Starter
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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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post #9 of 9 Old 12-02-2012, 08:55 PM
Mean Max
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Quote:
Originally Posted by kjg26 View Post
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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There is no situation that cannot be improved with a small but well-placed explosive.
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