[CostcoPizza]

My jeep gets bad vibes at 65+mph. Bad u-joints?

[ratmonkey]

Tire pressure. Tires out of balance. Poor alignment. Etc.

[jOHNNYdOUBE]

I had the most awesomest death wobble yesterday, But it is o.k.
My new polyurethane-energy suspension full kit and old man emu Steering stabilizer are on the way for my 96 Orvis ZJ with a 360.

Check the tires-alignment- and the suspension bushings.

[CostcoPizza]

Yeah I just fixed some major DW, replaced all kinds of bushing, put in a OME ss, upgraded my steering because my drag link ends where shot. It vibrated before all that but it would go into some super nasty DW going 70 and pull right like crazy. My DW is cured but I still get the vibes.

[bigbill888]

I have it too. Vibes from 60 to about 75, worst at 65. Alignment, steering linkage, and tires are in pretty good order I think. I'm gonna remove the front DS this weekend and go for test drive and see if I can learn anything doing that...

[keith20mm]

Originally Posted by Amauri

My jeep gets bad vibes at 65+mph. Bad u-joints?

I found vibrations caused by a failing tailshaft extension bearing. I replaced the entire tailshaft extension (housing with bearings) with a new Jeep part and vibrations ceased...

[bigbill888]

Originally Posted by bigbill888

I'm gonna remove the front DS this weekend and go for test drive and see if I can learn anything doing that...

So i dropped front DS and went for test drive. Vibes gone. Upon inspecting DS (again) U joints all seem fine, move freely with no slop noticeable (double cardan). However, there is a very, very small amount of sideways slop in the expansion joint that I never noted before, probably never really checked it. I think that was the source of my vibe. Fortunately I have a backup DS. It's not the greatest, but smoother than what I took off.