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Driveline Vibe Revisited (small question)

Backdraft

Backdraft

NAXJA Forum User
Location
TX
Ok guys,

Ive got a small driveline vibe on acceleration and deceleration around the 25-35mph range. I lowered the crossmember about a quarter inch and it still vibrates in that range. My question is since the vibe goes away at 35, is this something i shouldnt worry about or should i drop the transfer case a little lower and expierement more with that. Funds are preventing an SYE at the moment. Facts are 90 XJ, 4.0, AW4, 231, and 4 inch lift. TIA

Mike
 
IT would be Rustys 4 inch leaf packs in the rear.

Mike

BTW, there are new shocks on the rear now and i double checked everything and its all bolted up good n tite.
 
Very true. Thanks Remi and Chuck. These packs are used, and to my knowledge they were used for roughly 4 months. So as to the possibility that it is springwrap, I wouldnt think so at that age of use, but then again I have seen plenty of odd things. Ill go back into the garage and see about dropping the Tcase another 3/4 inch to total 1 full inch and see if that helps. If not, i have a guy near me that usually does all his own fabbing and troubleshooting. Hes pretty good at modified stuff but he is a CJ guy so dunno his knowledge of XJs. But hey, thats still a jeep:D

Ill keep you guys posted, and if ya have anymore brainstorms or oddities blurt em out, Ill take anything into consideration.

Mike
 
Well, after making an angle finder (dont ask). I measured the pinion angle to be 54* on the rear end and the transfer case output angle(measured at slip yoke) to be 51*. A difference of three degrees. Im thinking some three degree shims ought to fix this nightmare.

Mike
 
Just an update to anyone who cares. I waited and waited on some 2.5* axle shims to come in after ordering them. Got em on today and no more vibes. THANK GOD
Only weird thing is, everyone I talked to said to put them in with the thick part to the back and that made the vibes worse. Reinstalled them with the thick part to the front and it solved my probles. Weird, but true.
Thanks as always fer all your opnions. Now all I need to do is raise the front another inch or so to get the thing level.(ass high)

Mike
 
I dont no where you got your info from,but on a Non-sye the fat end Does go Forward(typically).
 
GRRRRRRRRRRRRR...........:mad:

Well isnt that just magical. Thats what I get for listening to other people instead of trusting my math. Oh well, I guess a little extra work doesnt hurt anyone.

Mike
 
RCP Phx said:
I dont no where you got your info from,but on a Non-sye the fat end Does go Forward(typically).
Click to expand...
I think that depends wether it was a shackle lift or an AAL.... I Think a shackle would get the fat end forward to even out the angles, and the AAL would get the fat end to the back.

Kejtar
 
However confusing it is, it rides pretty good now:D ;)

Mike
 
I had the same problem after my 4 inch lift with aal and blocks, 4' shims, fat end to the back solved it. I dont know how yours got better fat end to the front. That does not make sence.
 
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