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Old 03-04-2012, 04:07 PM   #1
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Vibration (Driveshaft)

OK so my problem is a rumble or vibration when going through the gears. When the clutch is in but moving its fine, when the rear shaft is out and running on front drive its fine. I thought maybe it was my tires since there 35s and pretty much shot. But i believe maybe its the shaft. I have 4inch lift with 35s, sye kit, i was braking u joints recently but i replaced all in the rear and made no difference. (They were shot though) I also have new gears in the diff so i know they are ok. I was told that my driveshaft is to short and the angles are bad. Would pictures help you guys out?

I was thinking of replacing the driveshaft. But would like to know for sure if thats the problem.

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Old 03-04-2012, 06:50 PM   #2
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I would check the pinion angle first, if thats good id try and find a drive shaft shop and get it balanced.. heres a link for checking pinion angle

Pinion Angle Alignment - 1

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Old 03-04-2012, 07:08 PM   #3
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Thanks, got to go get an angle finder tomorrow.

Can the angles change over time or do they stay the same. Just wondering because the vibrations were not there when i first got it.
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Old 03-05-2012, 07:02 PM   #4
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can anyone tell me what the angle should be for a tj w/ 4 inch lift with 35s?

And the length of the cv driveshaft if they could
thanks
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Old 03-05-2012, 07:46 PM   #5
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the angles should not change over time...maybe the bushings are worn allowing the axle to rotate under load...

theres no standard angle for a four inch lift, put the angle finder on the drive shaft and then on the rear axle like in the link i posted.. the axle should be the same degree as the drive shaft, some people run the axle 1 degree lower because the axle will rotate up under load..

do you have adjustable upper control arms?

I run a super short sye and i beleive my drive shaft is 22" center yoke to center yoke
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Old 03-06-2012, 07:39 PM   #6
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i figure a 10 degree difference isn't good.. i just looked under and could tell the angle was bad. i did not correct it since its to dark out so i will let you know
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Old 03-08-2012, 06:38 PM   #7
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bought adjustable caps. didn't have them. only problem now is the bolt its behind the muffler making it a pain in the ass

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