Rear end lurching side to side....

[Smallblock454]

Hello,

first, i don't know if it's a good idea to put a 2002 S suspension in 1999 non S, because of the engine/transmission weight difference. Also the S setup takes the different unsprung masses into account (S brakes and wheels weight more).

I don't think that is a engine / transmission mount problem. Maybe if all engine and transmission mounts are totally worn. But that would only have a short momentum and should be balanced out by the drive shafts of the car.

I suspect there is a problem with suspension and sway bars.

Regards, Markus

[Jthoms1]

Thanks guys...going to go over the install again to look at torque on the nuts and the sway bars.

[BYprodriver]

Originally Posted by Jthoms1

Thanks guys...going to go over the install again to look at torque on the nuts and the sway bars.

Easyest solution would be the spacers, insure they are installed properly & you have proper thread engagement with the lugs. Did you torque suspension bolts while loaded on the wheels?

[CHRISP357]

One of my first posts was a very similar problem. I could nearly change lanes with throttle change. Stand on it and it would change direction, chop the throttle and back it came.
Slightly mismatched tired. New sneaks and the problem was gone. Incidentally, 02 S model.

[Jthoms1]

I'm going to head out and check everything shortly. I had a thought and did some research last night. Given the fact I installed the "S" suspension my sway bar sizes changed. I ordered 19.8mm bushings for the rear and recall them seeming a bit to not fit the way I though they should. I can't recall what I put on the rear size wise. Last night on Pelican I saw it actually calls for 19.2mm. I ordered them and they will be hater later this week

My question...if the rear bushings are the wrong size could that cause it?