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Unread 01-04-2012, 06:20 PM   #16
roadyrob
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1987 YJ Wrangler 
 
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with the transfercase drop the transfer case and pinion should be parrallel, check that, you may need to shim the axle. as you didn't have a vibration before the lift I'm allmost certain thats your problem.

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Unread 01-04-2012, 07:10 PM   #17
jeeprookie15
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1987 YJ Wrangler 
 
Join Date: May 2011
Location: Hartwell, GA
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Im getting my wheels aligned some time in the morning tomorrow, so ill let yall know if thats the problem or not. Im pretty positive my shackle bolts are tight. If the problem continues i will check on that driveshaft. Ill keep yall posted though on the situation
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Unread 01-04-2012, 07:31 PM   #18
Raindem
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Quote:
Originally Posted by roadyrob View Post
with the transfercase drop the transfer case and pinion should be parrallel, check that, you may need to shim the axle. as you didn't have a vibration before the lift I'm allmost certain thats your problem.
I agree, it's a geometry issue. I had a similar issue after installing my 2-1/2 lift. At first I installed the TC drop that came with my kit but not the axle wedges. Test drove it and discovered that it vibrated, rather knocked, in 4th gear. After I installed the wedges all the noise/vibration disappeared.
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Unread 01-04-2012, 07:39 PM   #19
jeeprookie15
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Raindem, what are these wedges you speak of?
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Unread 01-04-2012, 08:03 PM   #20
meSiLlY
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Quote:
Originally Posted by jeeprookie15 View Post
Raindem, what are these wedges you speak of?
These are wedges. You'd need to check your angles to determine what size you need.

http://www.4wheelparts.com/Drivetrai...ct&emlprox=out
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Unread 01-04-2012, 08:08 PM   #21
jeeprookie15
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oh, my leaf springs with the kit came with those already on them. And im sure that i got the little pins through the holes on those things
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Unread 01-04-2012, 09:00 PM   #22
HanksRide
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Guys not all jeeps are the same, some will need a 6 degree shim and others 4 or 8 even 10 degrees. I am not sure what came on your lift kit but that doesn't mean that it is the right shim for your jeep. When I installed mine I went through several before I finally bought the 10.00 angle finder and listened to what was being said, slowed down took some measurements and got the right shims along with a SYE and CV/DS. No more vibes for me. Or if you can weld you can cut off your perch mounts and set your pinion angle then re-weld them back in the right position. This is by far the best fix.

If you did not have the vibes before the lift install and are on the same tires then I am sure it is not the tires (more than likely). Also do a search for removing trac bars / sway bars.. Take both of them off both ends and throw them in the trash can or use them for scrap metal. If your jeep is setup correctly you will not know the difference with them gone.. I know that this is a heated subject and may cause some controversial debate but I think 80 to 90 percent of people on this forum that have been jeepin for years will agree to get rid of them. My wife drives my jeep almost daily on interstate and highways everywhere and has no issues with them gone. Best mod I ever did to get my jeep to flex and perform like it is suppose to..

Good luck and get an angle finder!!
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Unread 01-05-2012, 04:04 PM   #23
jeeprookie15
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Got my tires aligned. It still vibrates loud and bad but only when i start to let off the gas when im in 4th or 5th gear. And all of a sudden this knocking noise comes from my brakes when im hitting the brakes at low speeds, whats up with that??
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