We installed :


So now when I accelerate and stop accelerating I hear a noise coming from the rear like the differential was moving back and foward. To make the noise I simple press the gaz pedal and relase it it does a "TOK", rear seems stiff from left to right.


Do you have any idea ?

 

I've had those same LCAs on my car for over 20 years now; no problems.

Whatever is going on, they're not the cause.

I'm not sure what you mean by

If you mean "seems to shift from...", you need a Panhard bar as well. But the rest of the description sounds like you need a torque arm bushing.

 

Nha I mean the differential doesn't move fromleft to right... I think this is the torque arm bushing too....