YJ high speed shakes

[OffRoadNewbie]

There's not enough info. People will only throw guesses at it.

The only way we can help is to either teach you how to diagnose, or get you to do a few checks and report back.

First check is always a the wheel shake with the tires on the ground. Watch for anything that moves. If you dont know how much movement to look for, look at the corresponding part and see how much it moves. If one part moves more then the others, there is a problem.

Watch the distance between the dust sheild and unit bearing. If it varies during the shake test, the bearing is shot.

If all that checks out (which I doubt on a YJ) inspect the tires and rims. Visually inspect the tires for cupping, out of round, or blown belts. All that checks out, do a runout test on the rims, most importantly if they are steel. Dont know what values to look for with a rim runout, do more then 1.

Still dont find anything

Jack the front end off the ground, and check the balljoints. Either a long bar directly under the tire and pry up and down, or hands at 7 and 2 oclock and pry on the tire.

Go through all that and cant find anything, bring it to someone else to take a second look to hopefully find what might have been missed.

Good luck

i  am new to this site but this is one of the best repleys i have seen in a long time .......BRAVO !!!

[Sprockett]

My experience with this for what it's worth: I had the exact same symptoms. This problem is no doubt not guarenteed to be the same but...

Bnine identified a worn front track bar bushing for me. After I replaced it, the shake changed but did not go away completely. The root cause of the problem was poorly balanced wheels and the worn bushing just allowed more movement once the shinmmy started. Again, on Bnine's suggestion I ditched the steel wheels for high quality aluminum wheels and quality tires. Now, I've had the jeep up to 125kph on the highway and it feels as solid as any car I've driven. I've read some people have had good results with beads or BBs in the tire for balancing which, if the wheels/tires are the issue, might be a cheaper solution.

[jeeper]

check your t case my 97 tj was shaking and vibrating  at 80 - 100 km
it was bad i changed my u joints   and  re balanced  the tires   and no change   till today when  the t case blew apart