Hi- Sorry for the vague description. We have a '73 LeSabre with a newly installed 455. Under heavy throttle, it seems like the rearend is shifting around a little bit under the car. Is this just a matter of worn out rubber bushings? When I've been under the car I haven't seen anything out of line, and when the rearend was installed everything seemed tight... But I haven't been looking hard yet either... Any ideas where I should start looking? -Bob C.
I am unfamiliar with a 73 LeSabre. Does it have a 4-link (two upper and two lower control arms) setup? This isn't because the rear tires are spinning in excessive of actual speed and trying to pass the front end is it? :Brow: If the bushings are old, they can still look OK but be shot. Things I'd check in this order: 1) Tires good and fully inflated. 2) Shocks should be decent and not allow the body to bounce excessively. 3) Check torque on all the attaching bolts, make sure no mounting holes are wallowed out. 4) Jack car up and check the rear wheel bearings to be sure they aren't worn out. 5) Put a rear anti-sway bar on it. If that turns up nothing after checking all of that, maybe someone else will chime in.
Yes, it should have the 4-link. Is this when you're driving in a straight line? Boxing the lower control arms helps to improve handling when cornering fast. How are the engine/transmission mount rubbers? Check what Greg wrote above first, and keep us posted :TU:
Hi, All- Problem solved. Turns out there can be an issue with replacement bushings where the sleeves are too large for the OEM bolts. http://www.v8buick.com/showthread.php?296995-Rear-control-arms-for-73-LeSabre&p=2467852 Just wanted to post it here in case anyone has a similar problem in the future and the search function brings them here - one of the things to check is the sleeve diameter in replacement control arm bushings. Car rides like a dream now. -Bob C.
