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Old 05-03-2013, 04:42 AM   #1
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Major driveline vibration. Please help!

Thank you to all that take the time to help me out. I have an 03 Tj wrangler sahara with a manual transmission and a 4.5" lift professionally installed. I have gone through 3 rear driveshaft rebuilds over the past 6 years. I decided to install a skyjacker transfer case lowering kit to reduce the angle on the shaft. I installed the kit as per manufacturer instructions which included adding an adapter on the t case pivot assembly. I also loosened the 4 bolts at the bottom of the skid plate to allow the t case and tranny to shift slightly while I did the install. I retightened everything and went for a drive. The vibration is out of control now. My dashboard feel like its going to vibrate and fall off, its that bad. The vibes are the worst around 20mph and reduce to barely noticeable around 45mph. I didn't go any faster for fear of damaging something. My jeep didn't vibrate anything like this at any speed prior to the install. Any advice? I am at the point if bringing to a specialist but that is definitely gonna cost a good chunk of money. Thanks again for any help.

Chris

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Old 05-03-2013, 07:34 AM   #2
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From all the reading I have done here, I would say an SYE and cv driveshaft are needed. From what I have found at 4+ inches of lift these are essential to the lift process. I am in the process of finishing my 4 in lift and SYE/ DS, as I wanted to make sure it was done correctly. Hope this helps lead you in the right direction.

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Old 05-03-2013, 08:02 AM   #3
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2x on the sye kit!

Even with lowering the transfer case your u-joints are probably past max angular deflection. Also, lowering the transfer case can, in some situations, make things worse. Drive shafts work best if the input deflection angle is the same (but opposite) as the output deflection angle. Ie: if the angle out of the transmission is, say, 3 degrees down, the pinion connection ideally should 3 up. This is less of an issue when the defection is small but becomes more of an issue the steeper the angles. Variations up to 1 degree are no big deal but above that the vibration will increase the bigger the difference in the two angles. If you want a real in depth discussion check out http://www.hotrodhotline.com/md/html..._harmonics.php. or Tom Woods site: http://www.4xshaft.com/driveline101.html. Both go into great detail.

Otherwise, I'd say at least a sye kit and possibly add a CV joint in your new longer driveshaft.
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Old 05-03-2013, 12:38 PM   #4
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You need an sye, DC shaft, angled track bar bracket, and adjustable upper control arms. Install the sye and other components then measure for the custom driveshaft. Don't forget to remove that newly installed transfer case drop. This is also a good time to replace the stock transfer case skid with a flatter skid.
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Old 05-03-2013, 01:18 PM   #5
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X2 on the advice to install a SYE kit & aftermarket CV driveshaft. A transfer case drop is usually never enough to cure the vibes caused by a 4" suspension lift except on a long-wheelbase Jeep like an Unlimited.

You'll also need adjustable length upper rear control arms so the rear axle's pinion angle can be raised to work properly with the CV driveshaft. Once a SYE & CV driveshaft is installed, remove the t-case drop which will also restore the ground clearance lost when the tcase drop was installed.
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