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post #1 of (permalink) Old 08-12-2004, 08:18 AM Thread Starter
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CV driveshaft or adj. upper control arms?

i just put on the RE 3.5 super flex (including 1" tranny drop) on the TJ. (4.0/5spd/d44) and it now has some vibrations. i was told that the 2 options were adjustable upper control arms to change the pinion angle, or to get a cv driveshaft. what do you all recomend?

thanks all
shawn
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post #2 of (permalink) Old 08-12-2004, 08:56 AM
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Re: CV driveshaft or adj. upper control arms?

Sounds like you have got a pretty nice set up going on. After your lift did you install new tires? or are they still yet to come. I ask because... Could it be possibile that your Vib is coming from a tire, and not the drivshaft? Try switching the tires front to back, and see if your vib moves.
If you are sure it is the rear drive shaft then you should address it. If you do decide to go with a CV type shaft, you are going to have to address pinion angle. You new CV shaft will be happiest if the pinion is pointed directly at the output of your Transfer case.
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post #3 of (permalink) Old 08-12-2004, 03:47 PM
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Re: CV driveshaft or adj. upper control arms?

Any time you go over 3", you will never be able to adjust the pinion angle to get out the vibrations under all driving conditions.
Save youself some time and headachs....get the CV driveshaft. You will also need to get the adjustable control arms so you can point your diff so that it is inline with the driveshaft.
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post #4 of (permalink) Old 08-12-2004, 04:45 PM Thread Starter
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Re: CV driveshaft or adj. upper control arms?

yeah i put on new 33's with the lift. but the vibe is def the drive shaft. when i push in the clutch it goes away. so you are saying that just one or the other will not help, i need both?

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post #5 of (permalink) Old 08-12-2004, 04:51 PM
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Re: CV driveshaft or adj. upper control arms?

You need the CV driveshaft no mater what. But with the CV driveshaft, the angle of the diff needs to be inline with the driveshaft. The only way to point the diff up is by adjusting the control arms. For us guys with older jeeps using leaf springs, we have to use shims or cut the pad off and re-weld.
post #6 of (permalink) Old 08-12-2004, 04:55 PM
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Re: CV driveshaft or adj. upper control arms?

Don't know who made these images up but your driveshaft should look like one of these:



If your pinion is not pointing correctly for your application you will get vibes out of it.

You likely need to do some adjustment on your UCA's to get the pinion aimed correctly again.

OR

you could go the other direction and aim the pinion up at the t-case and get a CV shaft.

Clear as mud???
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