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post #1 of 4 Old 02-23-2014, 06:40 PM Thread Starter
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1992 YJ Wrangler 
Join Date: Jan 2008
Location: Baltimore, MD
Posts: 78
jeep vibrations

I have a 92 yj. I have had 3.5" bds lift on there for years. I also have the transfer case drop. I broke my stock front shackle and decided to replace all 4 with the 1" bds shackles. Now I'm getting vibration especially if your giving it gas and then just release off the gas or putting it in neutral and coasting to a redlight. Would that 1" more lift cause that? Is it time for a sye kit? If so what all do I need to get to stop vibration? Also have a ford 8.8 rear. Any help greatly appreciated.

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post #2 of 4 Old 02-24-2014, 09:52 AM
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1988 YJ Wrangler 
Join Date: Sep 2010
Location: Cortez
Posts: 7,633
Whether or not the 1" lift shackles are causing vibes that can't be cured without an SYE, the change in your driveshaft angles are causing the vibes. You may be able to correct them and eliminate the vibes but I would recommend an SYE. Long story short, I installed a skid plate that changed my t-case output angle slightly and with my hard top on I had vibrations under even slight throttle. Pulled the hard top off and that slight change in suspension height cured my vibes.

A motor mount lift would probably help if you can't afford an SYE.

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post #3 of 4 Old 02-24-2014, 10:30 AM
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1988 YJ Wrangler 
Join Date: Jun 2013
Location: Whittier
Posts: 2,005
Do you have pinion angle shims under the spring perches? If you're borderline on the angle, 4 degree shims might be enough to correct the vibes. And you are borderline if just changing shackles caused the vibes to pop up. Or you could ditch the rear lift shackles and go back to stock and see what happens.

But yeah, SYE would be the ideal fix.

Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #4 of 4 Old 02-24-2014, 11:01 AM
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1990 YJ Wrangler 
Join Date: Jun 2007
Location: San Diego
Posts: 18,605
What they all said.

Post a couple pictures of your driveline angle.

"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey

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