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Old 10-15-2009, 05:07 PM   #1
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Unwanted vibration.....help!!!

I have a 90 yj with a 4.2 6 cyl 5 speed with 32" tires.
when I drive down the road 1st gear is fine 2nd gear is where it starts between 25 and 30 mph and it goes all the way thru to freeway speeds. its a sort of pulsating vibration that comes in waves feels like something in the drive train
is off balance i've chased down what I know to check to no avail. checked the U-joints, checked the motor mounts, tranny mounts.
i dont know what it could be and in need of some help.

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Old 10-15-2009, 06:38 PM   #2
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do u hav a lift kit on it. if u do it might be your drive shaft vibrating.

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Old 10-15-2009, 11:04 PM   #3
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yeah it's lifted like 5" in the front 3.5"in the back. so how do I remedy that vibration?
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Old 10-15-2009, 11:08 PM   #4
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you transfer case must already be lowered?
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Old 10-16-2009, 02:28 AM   #5
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dont know if the xfer case is lowered, how would I be able to tell?
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Old 10-16-2009, 04:55 AM   #6
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This sounds like the death wobble. Check every component of the steering linkage.

Ball joints, tie rod ends, steering box, & the damper.

Trans lowered will have washers or spacers between the frame & belly pan/skid plate.
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Old 10-16-2009, 09:44 AM   #7
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If you have a lowering kit, there will be a piece of square tubing or round spacers between the frame and the skid plate that holds the transfer case up. mine is from rough country and it is about 1 1/2 inches thick. I had a terrible vibration until i installed transfer case lowering kit on my 93
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Old 10-16-2009, 10:59 AM   #8
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have you checked tire balance?
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Old 10-16-2009, 02:25 PM   #9
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I dont think it's death wobble I dont feel it in the steering whatsoever.
tire balance is good. where can i find a lowering kit for the xfer case? and how much will it run me?
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Old 10-16-2009, 02:33 PM   #10
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Do you have shims on the axel, changing the pinion angle?
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Old 10-16-2009, 03:26 PM   #11
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seems like i would have to open up the rear diff to find out.
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Old 10-16-2009, 09:55 PM   #12
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transfer case lowering kit will cost 30 or 40 dollars. rough countrys is square tubing with large holes on the top and regular on the bottom. It looks like jeep has large washers welded to the frame where the spacers go. thats why the hole is so big, so that the welded on washers will fit inside the tubing. rubicon express has a kit that comes with round spacers. the key is having long enough bolts. The bolts that hold the skid plate up are tapered. `look at the lift kits parts list from both of the above and you can get the part number you need for the drop. seems like the rough country kit was the cheaper of the two. installed mine th other day. very simple. you will need to loosen transmission and transfer case mounting bolts that are slotted to make everything line up.
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Old 10-17-2009, 05:05 AM   #13
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ok so it looks like I already have a slip yoke eliminator and a cv rear drive shaft
and it still vibrates so i guess i still need a transfer case lowering kit?
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Old 10-17-2009, 09:35 AM   #14
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1q!

Are there spacers between the frame and the skid plate holding up transmission? probably about an inch gap between frame and skid plate, if so
it has been lowered! if that is the case, im guessing your problem is that the
pinion angle is to steep. Does the rear drive shaft, where the ujoint hooks to differential look like a 45 degree angle. if so, I will bet thats where your vibration is coming from. its an easy fix. can you post pick of your rear drive shaft and differential?
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Old 10-17-2009, 04:20 PM   #15
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i'm kinda stoopid when it comes to computer stuff i got a mac and I dont know how to post a pic
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Old 10-19-2009, 07:46 AM   #16
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ok does the rear end (pinion yolk) seem pointed at the transfer case or is it parrallell with the ground?
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Old 10-19-2009, 02:40 PM   #17
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yes it's pointed up at the tranfer case.
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Old 10-19-2009, 02:52 PM   #18
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Did you figure out if the transfer case is lowered?
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Old 10-19-2009, 03:10 PM   #19
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you shouldnt need to lower the tcase if you have a sye and are running 32"s.

have you check for a bent driveshaft? my front shaft was bent to hell and when i locked the front it vibrated like a SOB
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Old 10-19-2009, 03:23 PM   #20
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i would be curious to know what exact changes were made
prior to the vibrations occurring...
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Old 10-19-2009, 05:45 PM   #21
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no the tcase is not lowered. the vibration has been happening since before
i permanently locked the front axle with a tj axle. before i got the jeep someone put the warn light duty manual hub lock conversion and burnt up the lockers. so i put the stock hubs back on and put a tj one piece axle in.
so it has the sye and cv shaft and the axle looks like its shimmed. i dont know what else it could be.?????????
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Old 10-19-2009, 06:36 PM   #22
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ok i know what u mean know mine started this today. but mine is at 45 and goes to 65 before it settles and i just perma locked the front end to.
its definitely not dw iv had that before in another rig not that. a lot less scary its more like the whole jeep hits harmonic resonance. and its a weird feeling and I'm going to go over all the things tomorrow i checked the same thing u did already, tranny mount and u joints and no luck so either i will unlock the front axle and try that. after i check all the fluids in the transfer case and diffs and tranny.
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Old 10-19-2009, 07:53 PM   #23
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yea it's like that but mine doesnt really settle it starts in third gear and doesnt stop it just kinda vibrates with higher frequency as I go higher in rev.it continues on thru to 5th gear im gonna try to change the fluid in the tranny and trans case and see what i get.
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Old 10-20-2009, 08:59 AM   #24
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Quote:
Originally Posted by lonepunker View Post
i permanently locked the front axle with a tj axle.

ill bet dollars to doughnuts your front shaft is either bent or out of balance. if its the stock shaft and you have ever left the pavement, ill almost guarantee your front shaft is bent. now that you have a one piece axleshaft, the driveshaft is always turning. the stock yj ds is crazy wimpy. mine looked like spaghetti when i pulled it out it was so bent
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Old 10-20-2009, 09:09 AM   #25
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does front axcel turn when in 2wd?
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Old 10-20-2009, 10:31 AM   #26
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Hey, my 87 wrangler does this very same thing too. Mine does it just over 50 mph in 5th gear. If I keep it in forth it doesn't seem to be as noticeable. I've only had mine for a month and honestly haven't had it much faster. Don't know if it would stop at a higher speed or not. It feels like it's coming from the drivetrain but at the same time it feels like its coming from the tires too. The tires are new 32 inch radials with the mud terrain design. Might not find out until I change tires though. Send me a message if you find out what this is before i do and I'll do the same for you. Thanks!
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Old 10-20-2009, 10:56 AM   #27
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it does now that he put in a one piece axel shaft
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Old 10-20-2009, 12:08 PM   #28
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huh well that would make some seance i suppose but i didn't think that the drive shaft spun unless the transfer case was locked in but i do know what u mean the drive shaft is really crappy and flimsy i can make mine flex with my hand
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Old 10-20-2009, 12:35 PM   #29
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with no cad and no lockouts, the axle will spin the d-shaft. its not engaged to the tcase, but it's turning
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Old 10-20-2009, 12:44 PM   #30
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sigh well shoot then chances are that is the problem then any were i ca get a frount drive shaft that wont be a pos

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