Rear differential

Asked by Tonysgoat Jul 12, 2019 at 08:26 PM about the 2004 Pontiac GTO Coupe

Question type: Maintenance & Repair

I took my car in to get an oil change and the guy tells
me I have a rear differential leak and he'll fix it by
replacing the pinion seal and differential cover seal
and replace the gear lube. He did the job and it was
my first time driving the car, I get about a mile and a
half down the road and the rear end feels like it jerked
and locked up on me. I get it towed back to his shop
and he says my pinion bearing is shredded and shot
so it needs replaced. He wants to charge me more
money for the repair. Could this be something he
caused? Keep in mind my car was running fine with
no problems and no rear end noise when I took it in.
Please help, thanks!

1 Answer
10

MaDcustoms answered 5 years ago

There is a very good chance that he over-torqued the pinion flange nut. If the nut is over- torqued the preload on bearing will be exceeded and the differential will need a overhaul or a total replacement. After the job is done the rotational torque should be of 2 to 4 lb in. Some carrier assy will tolerate a over-torque nut but some need more precision on procedure.

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