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Locking Rear End Problems

jdr7785

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jdr7785 Enthusiast

jdr7785

Posted
Posted
So I was happy today, because the dealership that I bought my used truck fixed some wheel bearings and a door for me. My happiness slowly faded when I got home and noticed that my rear end was locking up every time I took a left turn. It has done this before, and I just got the stupid thing re oiled about two months ago. It is a G80. Is there a reason it is doing it again? Is it time for a new one? Or should i just try to get it oiled again?

Im a college student, so I dont have much money.
Stevens03 Senior Enthusiast

Stevens03

Posted
Posted

Did you put the correct fluid in the differential? Some call for friction modifiers and other don't. If you added any, that could be whats causing your problem. I'm assuming it's a stock rear end and it doesn't call for any additives. Just make sure you get what GM specs :)

LURCH HD Enthusiast

LURCH HD

Posted
Posted
What do you mean when you say reoiled? Do you mean Had the rear-end serviced, changed the grease.
If so I only change mine ever 50K, I use Amsoil Syn. 75/90 and put in the friction modifier.
How many miles does your truck have on it? When I sold my 02 it had 291K on the factory rear-end.








It has done this before, and I just got the stupid thing re oiled about two months ago. It is a G80. Is there a reason it is doing it again? Is it time for a new one? Or should i just try to get it oiled again?
ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted
Sounds like it has a broken governor spring. Limited slip additive would do the opposite to what the diff is currently doing and nothing other than gear lube is required to be in these diffs, period. Mineral or Synthetic depending upon the year but that's it. No limited slip additive and no friction modifiers.
Z45 Senior Enthusiast

Z45

Posted
Posted
Locking differentials DO NOT REQUIRE a friction modifier. Those are only for use is Limited Slip Differentials and the use of a friction modifier in a G80 Locking Differential can cause problems.


[quote]The use of any additive in locking rear axles (G80) is not recommended. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars. All light duty trucks equipped with RPO G80 make use of a locking differential and the use of additives will delay the engagement of the locking mechanism and may decrease axle life.[/quote]

These are all the uses of code G80
Axle
G80 Differential, heavy-duty locking rear
G80 Differential, automatic locking rear
G80 Differential, heavy-duty automatic locking rear
G80 Differential, limited slip rear
G80 Differential, limited slip
G80 Differential, locking, heavy-duty, rear
G80 Differential, Zexel-torsen, limited-slip, rear
G80 Differential, automatic
G80 Rear Axle: Positraction
G80 Locking, Rear Axle
G80 Axle Positraction Limited Slip
G80 Differential, locking, rear
G85 Differential, limited slip
G86 Differential, limited slip
G86 Differential, limited slip, heavy-duty, rear
G94 Differential, full-locking rear
jdr7785 Enthusiast

jdr7785

Posted
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Posted
I actually took it back to the dealer, since it started doing this right after they fixed the wheel bearings. They said it was a pin or ring (i dont really remember) and that it had been broken and that they would replace it. I was extremely happy that they would finally fix it, but then I realized how the salesman tried to screw me over. I had this same problem earlier when i first bought the truck, he talked to a service dept. guy and they told me it just needed the oil changed. I guess he was just trying to get as much money as he could, cause when i asked a different service guy yesterday about it skidding, he said it was not normal and should have been fixed.

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