2004 gto rear end M6

**jjc239** · 03-08-2015, 10:32 PM

hey guys. just a quick question before i do more investigating myself. I went to go for a drive today to find ice under my tires when i tried to get it out. as i was rocking the car out of the spot i noticed that only one wheel was spinning. im not sure if this is from the ice or is my rear end going bad? is there some sure fire ways to test it out?

**Naaman** · 03-09-2015, 12:45 AM

That sounds normal. If neither wheel has traction, it usually just goes to the right side (I think).

**RONS98TA** · 03-09-2015, 04:15 AM

With a true POSI rear, both tires should spin together. There use to be a chevy pickup truck commercial that showed a Ford, Dodge, and Chevy truck on a hill. There was a set of rollers on this hill on 1 side of the truck. The commercial shows how the true posi rear would allow the truck to go up the hill, and the non posi rear would not have traction and just spin the 1 tire on the rollers.

**2002ssslp** · 03-09-2015, 05:14 AM

I'm not sure if it does the same thing in reverse but going forward both wheels should spin, that is the reason to have a posi rear, to get you out of trouble. If you have over 100k miles on your rear and you are a spirited driver I think you may be due for a new posi unit. The stock unit can't be rebuilt. Take your car to a safe location and do a burnout. look at the stripe(s) and the darkness. You should have two equal black stripes.

**Naaman** · 03-09-2015, 06:27 PM

These cars have posi? I thought it had a regular limited slip...

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Oh, wait... he's talking about a goat... so those have posi?

**2002ssslp** · 03-09-2015, 06:50 PM

Originally Posted by Naaman

These cars have posi? I thought it had a regular limited slip...

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Oh, wait... he's talking about a goat... so those have posi?

Posi traction, limited slip, tru traction, sure grip, twin grip, trak loc, anti spin and so on are all different names for a "posi rear"

**Naaman** · 03-09-2015, 06:57 PM

Oh.

**RONS98TA** · 03-10-2015, 03:43 AM

I Am not 100% sure, but I think even in reverse both tires should rotate. I cant wait until the weather breaks (hopefully soon) so I can run a ... um...experiment, to test the posi situation. I love a nice burning rubber smell! LOL. I do have an aftermarket MOSER rear, but it will still give me the answer i am looking for, or the very least the burning rubber tire smell I desire.

**JustinEntropyRad** · 03-10-2015, 12:19 PM

If it's got some miles on it, doesn't it have to roll far enough forwards to load across both wheels?

**RONS98TA** · 03-11-2015, 09:20 AM

I just gave my stock 2001 Silverado a lil test drive to test the posi out. Sitting still and flooring it will cause both wheels to spin. Doesn't matter if your in drive or reverse. It doesn't really take much. I guess when the rear sees slippage in one wheel, the other wheel locks in and the axle becomes locked. I think jjc239 is going to be replacing the rear soon. When my original 10 bolt on the 98TA started having issues, I replaced the fluid with some Royal Purple synthetic fluid which helped a bunch. In the end though a few years later, it was changed out, although it was still working.

**cammed goat** · 03-11-2015, 06:16 PM

Have you ever had the gear oil changed since you've had the car? Our cars have a mix of gear oil and friction modifier as the rears in the GTO are clutch-style and do not have spider/planetaries like regular diffs. 85w-140 and some friction modifier and the "one wheel peel" should be gone. Keep us posted.