[Shattered]

I've been trying to find the right fluid to use. I have an '08 Z51, and I have the clunking sound when making slow sharp turns. I know GM had problems, and changed the fluid spec. I looked online and found GM Dexron LS. Is this the right stuff? Help anyone? Thanks

 

[[email protected]]

I believe its DEXRON® LS gear oil, P/N 88862624 they claim no Friction Modifier is required with it .. that clutch chatter is a common problem

 

[Shattered]

I believe its DEXRON® LS gear oil, P/N 88862624 they claim no Friction Modifier is required with it .. that clutch chatter is a common problem

Thanks for the help fish, I will give it a try.:thumbsup:

 

[Ragtop 99]

I'd check with the dealer. I thought there was a TSB on it.

Fish, does that P/N have the modifier in it?

 

[[email protected]]

I'd check with the dealer. I thought there was a TSB on it.

Fish, does that P/N have the modifier in it?

thats what it said.. no additive needed with it..

 

[gbv]

AMSOIL. add their friction modifier, works great
I swapped after I changed the M6 lube to their Allison trans fluid, I'm in Arizona summer temps are brutal!
no I'm not a dealer.

 

[Roy Zink]

GM has a TSB on the clunking but it's not the dif fluid. It's the rear axle bolts. It's a 30 minute fix but you have to leave the car over night to give the type of Loc-tight they have to use a chance to cure.

 

[MarkyMark]

GM has a TSB on the clunking but it's not the dif fluid. It's the rear axle bolts. It's a 30 minute fix but you have to leave the car over night to give the type of Loc-tight they have to use a chance to cure.

Roy Zink....I have this problem....was going to have it looked at this coming spring. Did you have this repair done to your own car?

 

[Roy Zink]

Yes I did and it was covered under my extended warranty. It fixed the problem.

 

[roadeyboy]

Differential oil - service bulletin

See a dealer. Ask them to look up Service Bulletin #07-04-20-002B Document ID 2444918. This bulletin deals with this specific problem, and the fix is easy. It says the friction modifiers the factory used in '06 '07 and '08 cars was not correct. I bought an '06 C6 that spent its life in a garage, and there was some breakdown from sitting.

Saw this bulletin, changed the oil to DEXRON LS, problem disappeared.

Good luck, read the bulletin, it will all make sense.

 

[MarkyMark]

See a dealer. Ask them to look up Service Bulletin #07-04-20-002B Document ID 2444918. .

Thanks Roadeyboy....spoke with GM Service Rep today....He kept telling me there was no TSB...I will educate him....thanks for your help. Car is going in for service Wednesday...preparing for the summer touring trips.

 

[MarkyMark]

Follow up

Follow up....results successful.

GM Service performed
1) Complied with TSB 07-04-20-002B replacing differential fluid. Clutch chatter is gone. However, service bulletin states if clutch chatter continues to replace clutch plates.
2) Complied with TSB 07-04-95-001A re-torqued wheel drive shaft nut. Mine were not loose, so nut replacement was not performed. (See Roy Zink)

 

[Murph]

07/A6 Trans clunk

After reading this Tread, I took my rebought 07/A6 back to the dealer for a clunking in the rear when shifting from forward to reverse. They replaced the Diff. fluid with new GM fluid , but I am still hearing things I don't like. could it be the rear end bolts ? Is there a service bulletin on the axle bolts ? If so let me know. Thanks