jimmyb

Is there a TSB on the differential groan that occurs when turning the car (especially cold). If so, the number would be appreciated.

Thanks,
Jimmy

0vetteshop

You only want the #?

Rear Axle Chatter Shudder on Turns - keywords differential fluid noise oil #PIP3559 - (Sep 22, 2005)
Rear Axle Chatter Shudder on Turns
1999-2006 Chevrolet Corvette

2004-2006 Cadillac XLR

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Rear axle chatter or shudder on turns on Chevrolet Corvette and Cadillac XLR.

Recommendation/Instructions:
If this is the first complaint for this condition flush and fill the rear axle with P/N 89021669 (in Canada 89021670) gear lube and 4 ounces of the friction modifier additive P/N 01052358 (in Canada 992694).
If this is a repeat complaint or the condition persists after the flush and fill, replace the right and left rear axle clutch packs following published service procedures.
After clutch pack replacement use 1.6 l (1.69 qt) synthetic axle lubricant GM P/N 12378261 (Canadian P/N 10953455). and 4 ounces of the friction modifier additive P/N 01052358 (in Canada 992694).
Note: 2006 Z06 equipped vehicles require 2.55 l (2.70 qt) synthetic axle lubricant GM P/N 12378261 (Canadian P/N 10953455) and approximately 190 ml (6.4 oz) limited-slip differential lubricant additive GM P/N 1052358 (Canadian P/N 992694).

Note: Export vehicles use 2.01 l (2.12 qt) synthetic axle lubricant GM P/N 12378261 (Canadian P/N 10953455) and approximately 150 ml (5.1 oz) limited-slip differential lubricant additive GM P/N 1052358 (Canadian P/N 992694).

Once the axle fluid has been changed the car must be driven in 8 - 10 SLOW figure eights to work the fluid between the clutch plates.

sk1mcguire

Hello Vetteshop!

You are quick on the response and thanks for getting us this information. Do you know if this occurs only on manuals as I experienced it with my A4 yesterday when the temperature is about 30 or below.

Thanks in advance,

Jonathan

runutzzzzz

Is that what I'm hearing?? I thought it was my hard Z51 tires slipping on lock turns!

Thanks!

GTC

Cool info. So far, I'm only at complaint level #1, and that is exactly what they did for me. Well, they diagnosed it as viscosity breakdown of the diff gear fluid, which seemed very odd at less than 9,000 miles.

The most notable place I heard it was as I was making slow turns in parking garage.

GTC

It happened on my A4.

nascosta

I think my car has this too! A heavy groan or clunking under full lock of the wheel.

First time I've seen this reported.

MFW

I figured it was just a quirk of the car...it happens hot or cold, I hear it only when driving and turning slowly in parking lots/garages. Mine's a Z51 MN6.

sk1mcguire

Hello GTC,

Thanks for the information reagarding your A4 and similar symptoms. I never noticed in the warmer weather or maybe I just hadn't made a tight turn since now! I'll keep you posted on my local dealership and the repair process.

Keep in touch!

Jonathan

WA6AIK

I noticed this when starting out from a dead stop at a light and then turning right and punching it. It felt like the right rear hopped over something or hit a big pot hole. Mines an 02 C5 But I don't care, cause Kevin just sent me my Vin for my Monterey Red Vert. If it does it I'll let everybody know. The dealer didn't have a clue and said "couldn't find anything.

MikeyTX

My late father in law used to complain about the same thing when he refered to his wife.

ByByBMW

Happened on my A4. Had it almost since I got her new. Replaced the fluid myself and added the GM friction modifier and no more problem. My car has only 8700 miles now. Started noticing this in September.

sk1mcguire

Hello ByByBMW!

Any special type of ATF or just the GM recommended? Also, what is the friction modifier?

At your convenience!

Jonathan

ByByBMW

used Amsoil's Severe Gear 75W-90 gear oil. The friction modifier is the stuff you have to buy from the GM dealers. Don't remember the number right off the top of my head but just tell them you have the Limited slip diff in a C6 and they should know. The bottle is about 4 ounces if I remember right. Just the right size for our diffs.
OBTW, there are quite a few Amsoil users who say you don't need the GM stuff with their gear oil. I tend to agree but I used it anyway, can't hurt. Only issue is some people say if you use to much of the GM additive, your diff may not lock up as well as it is supposed to. Only a big issue when racing the car as far as I am concerned.
Hope this helps.

C66 Racing

4 oz is correct for the GM fluid. As you mention, the AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 does come with friction modifier in it and doesn't need any extra added (I don't use any extra). AMSOIL does state that if the diff chatters, it is safe to add a bottle of AMSOIL Slip-Lock Differential Additive (or equivalent), so as you noted, it won't break anything. But I do agree that it may result in some loss of limited slip ability which will hurt traction at the drag strip or coming out of slow speed corners.

66dreams

AC54ME

Here are some helpful TSB sites:

http://www.batauto.com/main.html

Another one, that will provide feed back:

http://www.troublecodes.net/technical/

GTC

Now that somebody else ttt'd it, I took my C6 into the shop for complaint level #2 yesterday. Just a tick over 11,000 miles on the odo, which is slightly more than 2,000 miles from when I brought it it for complaint level #1. At first they said that they couldn't reproduce the sound. I gave them a more detailed description of how to get it to misbehave. They tried again, and failed to. So when I went to pick it up, I took him for a drive and pointed out when it was making the sound. Then he had his main technician take a ride with me, and he heard the sound. The technician was saying that GM won't let them replace the clutch packs, that they'd have to get an entire new diff gear. They suggested that we do just a diff gear fluid change again. They said that they would call me back today, but they didn't.

This car is a nightmare.

crazyeddie

GTC, you need to stop it with these problems. Every time you get another one, so do I. I have noticed a crunching sound when making slow almost full lock turns. Something to report tomorrow when I take mine back for the top recall. It's a good thing I'm retired or I would be using all of my vacation time at the dealer. I'm still trying to like this thing, it's a good thing that it was never my dream because it's quite the nightmare.-Ed

Zoli007

Awesome, now I can have ammo to take to the dealer. Mine does this and I was wondering wtf it was.

Thanks