What happens if I have a GMC Sonoma with a Limited Slip Rear End and Non Synthetic or addictive is used? Just 80-90 was used?I have a clunking noise on my 2002 Sonoma and cant find anythingU-Joints are good, carrier bearing is good2002 GMCAutomatic4.3 Vortec
When does the clunk occur? EDIT: Alright, well that could be a few things. It kind of sounds to me like bad hub bearings. Get your tires off the ground and wiggle them up and down (not back and forth unless you wanted to check for bad ball joints). If there is play, then you will need a new hub assembly on that side. The other things I would check for are bad engine and transmission mounts, and the drive shaft-to pinion flange bolts to be sure they are not loose.
The additive is a friction modifier that prevents the clutches in the diff from chattering, put the stuff in the rear end and see if it quieted down.
usually if you don,t use limited slip additive you will get a chatter going around turns. check the big nut on the pinion gear, it could be loose. you will have to drop the back of the drive shaft to get to the nut.
