C5 Z06 Positraction Problem

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Dec 5, 2007 | 11:54 AM

daleyellin

Thread Starter

6th Gear

Joined: Dec 2007

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C5 Z06 Positraction Problem

I need some help with a problem I'm encountering which my local dealer, or GM, has not been able to solve.

Here's the situation. The positraction clutches seem to be seizing when the steering is close to full lock, either direction, and whether backing up or going foward. This generally occurs when the car is started first thing in the morning and the weather is cold. It also occurs even if the car has been driven that day, but when it has been sitting, during cold weather, long enough to cool down.

Following a GM service bulleting, the dealer has drained the rear end and replaced the oil and anti-seize compound twice, with driving 1000 miles between each change, per the service bulletin. When this didn't solve the problem, a new clutch/disk pack was installed. Now that the weather is cooling off, and with only 2000 miles since the clutch/disk pack was replaced, I am still getting the positraction seizing problem.

Any advice would be appreciated. The dealer, and GM, have pretty much thrown their hands up and say they've done everthing the can per the service bulletin.

Thanks,
Dale Yellin

Dec 5, 2007 | 12:19 PM

jirasvet

Burning Brakes

Joined: Jul 2007

Posts: 881

Likes: 2

From: hill billy hell

For What it is worth

My Z06 will do this on occasion not enough for me to be overly concerned
about. Even more so since the car is out of warranty.

If your car is still under warranty tell them you want a whole new rear end
You give it some time those clutch packs will wear allowing more slippage.

Dec 5, 2007 | 04:14 PM

Chevy Guy

Team Owner

Joined: Jan 2004

Posts: 22,185

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From: NJ

I believe you need a bottle of GM posi lube added to the rear, its a common issue. Once the lube is in there go to a parking lot and drive some figure 8's to get the lube into the clutches.

Dec 5, 2007 | 05:04 PM

Pumba

Melting Slicks

Joined: Sep 2003

Posts: 2,458

Likes: 105

From: Northville Michigan

Quote:

Originally Posted by Chevy Guy

I believe you need a bottle of GM posi lube added to the rear, its a common issue. Once the lube is in there go to a parking lot and drive some figure 8's to get the lube into the clutches.

I agreed with Chevy Guy. I would go further by suggesting that you use or add a second bottle of the GM Positraction lube.

Good luck.

Dec 5, 2007 | 05:20 PM

Bluefire

Le Mans Master

Joined: May 2006

Posts: 7,835

Likes: 224

From: Hillsboro OR

Quote:

Originally Posted by Pumba

I agreed with Chevy Guy. I would go further by suggesting that you use or add a second bottle of the GM Positraction lube.

Good luck.

True. This could help but too much LSD fluid and the clutches will start to slip.

I hate to be the bearer of bad news but......I had the same problem on my 03 Coupe. After the third time in 1 1/2 years, the only fix was installing a DTE 3:42 rearend.

It was a wonderful upgrade from the chitty 2:73's.

Your car already has the 3:42's. This might be a good time to upgrade to 3:73's or 3:90's.

Dec 5, 2007 | 07:30 PM

jirasvet

Burning Brakes

Joined: Jul 2007

Posts: 881

Likes: 2

From: hill billy hell

[QUOTE=Bluefire;1563043362]True. This could help but too much LSD fluid and the clutches will start to slip.

The GM rear end additive is to help the clutches to eliminate any chatter or squawking noises when turning.

Some will say you should upgrade to a synthetic gear oil that already has
the additive in it.

Dec 5, 2007 | 09:01 PM

Blowa-Z

Advanced

Joined: Nov 2007

Posts: 57

Likes: 0

From: Port Angeles Wa.

Quote:

Originally Posted by Chevy Guy

I believe you need a bottle of GM posi lube added to the rear, its a common issue. Once the lube is in there go to a parking lot and drive some figure 8's to get the lube into the clutches.

Good Chance That Will Work, But I hate To even say it, good old Ford stinky posi. lube, is my choice for problem child's. Don't get it on you, throw the rag away when your done (out side), do your figure eights in stages, don't overheat the clutches or you will always have chatter.

Dec 7, 2007 | 07:49 PM

daleyellin

Thread Starter

6th Gear

Joined: Dec 2007

Posts: 6

Likes: 0

Again, thanks for all who offered suggestions. After reviewing the forum responses with the dealer, they agreed to re-service the rear end with the new tech bulletin recommendation -- Mobil 1 and two bottles of GM Positraction Fluid.

I'll let you know how it is working in a couple of weeks.

Thanks.

Dale