Rear Wheel Chatter

[Dingfodgy]

Every once in awhile and usually when making a low-speed turn from a stop- one of my rear wheels will chatter and the truck shudders until I get out of the turn. It almost feels like the rearend is trying to push the truck straight even though I'm turning. According to my SPID I don't have a Posi, but that doesn't mean the diff wasn't swapped out. I'm gonna pop the rear cover off this weekend and see what exactly is back there. While I'm at it- what should I look for that might be causing this issue? Could it be a posi unit that is going south on me or would a one-tire-frier do this as well under certain conditions?

[Livrat]

IMHO it sounds like posi clutch chatter, you may be able to quiet it down with what is called posi lube, its an additive that GM used in the from the factory. if that does not do the trick it may be time for new clutches in it.

[El Jay]

Originally Posted by Livrat

IMHO it sounds like posi clutch chatter, you may be able to quiet it down with what is called posi lube, its an additive that GM used in the from the factory. if that does not do the trick it may be time for new clutches in it.

I agree with livrat.
Pull the differential cover & drain everything.
After you replace the cover, put in a bottle, or tube of posi lube, & then top it off with a good synthetic 90W gear lube.

If that doesn't take care of it, you're out may $15, tops; but the rear end lube has still been changed.

BTW, I had this same problem with my '69, & the aforementioned worked wonders.