For a year now I have had this problem it is getting much worst. I haven't been able to get anyone to say there is something wrong. When I step on the gas at a stop the car will jerk forward. If I let off the gas while driving and hit the gas there is a funny feeling in the rear of the car. When driving on the freeway the car seems to have a mind of its own. There rear seems to want to go to the side, I am also correcting.
Thanks for your help

 

Depends, you have to have some slack in the drive train. Mainly the ring and pinion and spider gears in the diff. None in the ujoints or jurid couplings.
Seldom do i ever see a bad u joint, so i would say to check the driveshaft jurid couplings where the shaft attaches at the diff and the trans. They tend to break/crack with time and mileage since theyre rubber. Thats about all i can say since you didnt include yr or mileage. And i assume its a xj8 since youre in that section

 

Yes, xj8 1999 155k in Washington state. I will have to take it to someone to check this out. Don't know who to trust and don't want to drive to far. Jag dealer miles away on freeway and car isn't driving very well. It makes me nervous with the way it is handling. Thanks

 

do you have a jack and stands? why dont you jack in uo, check your tires for tread seperation and look at the driveshaft couplings. you can post pics too and we can help

 

They took it for a test drive and crashed it. Good thing was no injuries. Never really got the test drive. The mechanic said everything looked good when it was on the lift. He made no comments on the driveshaft. Thanks for you help.

 

Damn, of all the cars they couldve crashed, it had to be an xj8

EDIT: I would check the knuckle bushings in the rear. If it is walking, something has play in it. Get the rear tires off the ground and try to wiggle them all directions. This may allow you to see what has developed slack. Good luck.

 

What a lame , glad no one was hurt .

 

Uhoh, what kind of "dealer" ist that?

 

I hope they admitted it wasnt driving normally now! I do hope they fix the damage and find the rear end wandering issue, and keep them honest on the price. Its understandable the may try to recoup some of they're body repair cost in your rear end.