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Unread 10-15-2013, 01:29 PM   #1
jackedupjeep99
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1999 xj driveline viberations please help!

hey guy ive got a 1999 xj I just put 6 in front 5 in the back rc an coil spacers an shackles and I have bad driveline viberations between 20-40 mph I was wondering if anybody knows from experience if the t case 1 inch drop will do the trick or do I really have to get a sye? would deeply appreciate it somebody could let me know or if theres another cheaper way besides a sye thank you!

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Unread 10-15-2013, 03:07 PM   #2
jackedupjeep99
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can somebody please help me
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Unread 10-15-2013, 05:08 PM   #3
sAe23
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At 6" of lift, a T-case drop might not be enough. U-joints have a limited amount of angle that they can operate smoothly through.
You likely will need a Double Cardan drive shaft. Someone else here posted about finding one for use on a late model XJ that did NOT re-locate the slip yoke or require a SYE (the later T-cases apparently do not leak fluid if you drive with the rear shaft removed, a big oversight on the earlier T-cases).
Also, don't ignore the front shaft. If your CASTER angle is close to spec, your front PINION angle is likely off enough to contribute to the problem, and a T-case drop will make this worse.
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Unread 10-15-2013, 05:33 PM   #4
CJ7-Tim
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At 6" of lift you NEED an SYE. See picture for proof. As suggested, check the front axle also.


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231-explode-3.jpg

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Unread 10-16-2013, 01:46 PM   #5
jackedupjeep99
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thanks guys I appreciate it ive already ordered the t case drop and see what happens if I have to get a a sye I can use a xj front shaft correct?
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Unread 10-16-2013, 06:30 PM   #6
CJ7-Tim
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Quote:
Originally Posted by jackedupjeep99 View Post
... if I have to get a a sye I can use a xj front shaft correct?
With an automatic transmission, yes you can.
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Unread 10-16-2013, 07:50 PM   #7
sAe23
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You could also look into this: http://www.jeepforum.com/forum/f11/o...l#post16493929 (It's what I referred to earlier.)

He got it from this Ebay auction: http://www.ebay.com/itm/250832072719...84.m1438.l2649

About the same cost overall, but less work
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Unread 10-17-2013, 03:27 PM   #8
jackedupjeep99
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has anybody tried that shaft on a newer xj?97-01? please let me know!! thank you sae might have to try that!!
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