TJ intermittent vibration question...butt tickler. - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 02-15-2003, 07:57 AM
Posts: n/a
TJ intermittent vibration question...butt tickler.

I have a 1999 TJ 4.0L Auto that originally came with a soft-top, but I found and added a hard-top to help deal with the NW-Pennsylvania winters. I have a 2.5" Skyjacker suspension lift (with the transfer case spacers) that is designed for use with a hard-top. I run 32" tires on Rockcrawler wheels. I recently installed a 4.10-geared rear axle and had the front Dana 30 re-geared to match.

It has a vibration that begins at highway speeds (55mph+) that is very rhythmic. It runs about 1 second on then 1 second off. It doesn't matter if I hit bumps in the road or not, as long as the speed is maintained it keeps it's pattern. It's just a slight tickle and noise, nothing too obnoxious...I'm just wondering if I should be worried about my next long-drive down the road.

It did not do this when I had the lift and tires and everything the same but with 3.07 gears. I figure that it is showing up now because the driveline is turning at a higher rate because of the re-gearing. I remember the Skyjacker instructions saying something about vibration and a special adapter (or something) to stop it.

Is this something that a S.Y.E. would most likely eliminate? I have been holding off on that project until I go with the 5.5" lift which will be just down the road instead of having to buy another (longer) driveshaft.

THANKS for the help.
Sponsored Links
post #2 of (permalink) Old 02-15-2003, 08:59 AM
Old Hand
gigolo's Avatar
Join Date: Feb 2001
Location: kansas city
Posts: 935
Thanks: 0
Thanked 0 Times in 0 Posts
Re: TJ intermittent vibration question...butt tickler.

I wouldn't think you'd need a SYE because A) it's only 2.5" of lift and you have the t-case spacers B) you didn't (knowingly) change the pinion angle and it worked fine before.
You say you put in a 4.10 geared axle, was this a complete axle you bought and bolted in? What's it from? Custom made or stock? Get an angle finder and check the pinion and t-case angles.If the control arm mounts are positioned just a little different than the other axle's were, the pinion angle could be off. It could also be a slight tweak to a tube on the axle you bought. Or a tire worn a little uneven that was put on the opposite side during all the work. Lot's of possible causes, I just learned to live with my slight vibe that comes in from 65-75, but that's running on unbalanced 35" mtr's.
gigolo is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome