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-   -   '08-'09 transmission TSB (http://www.z06vette.com/forums/f64/08-09-transmission-tsb-113470/)

No Doubt 11-27-2008 05:00 PM

'08-'09 transmission TSB
For those who have a 2008 - 2009 Z06 that's experiencing hard or noisy shifts, here is the text of a TSB concerning the issue...

"#PIP4357: Noise During The 1-2 Shift When Cold - keywords first grate grind second - (Feb 27, 2008)

Models: 2009 Cadillac CTS-V - Tremec Transmission RPO Code MG9

2008-2009 Chevrolet Corvette, Corvette Z06

Equipped With Tremec Manual Transmission RPO Code MM6, MZ6 or MH3

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


Some customers may comment about a nibble or grate type noise that may also be described as a multiple bump feel during 1-2 upshift event while the transmission is cold.


A new transmission synchronizer design was released for the 2008 and 2009 models listed above. The new synchronizer will make a noise when shifting from 1st to 2nd gear in temperatures at or below 32 degrees F.

This noise/feel is a normal characteristic and will go away after the transmission warms up. Warm up should occur after approximately 15 miles of normal driving. This condition requires no repair by the dealer.

The service technician should test drive the vehicle to verify the concern. If the noise/feel goes away after the warm up no repair is necessary and the customer should be advised accordingly."

jub jub 11-27-2008 06:30 PM

Re: '08-'09 transmission TSB
No fix...just as well. Nobody is going to touch my car that calls themself a mechanic or technician. :mah:

ZO6 AL-X 11-28-2008 01:29 PM

You're damned if you, damned if you don't.

ForcedVette 11-28-2008 07:27 PM

Re: '08-'09 transmission TSB
So that's it. Case closed. All in all, its still better then my T-56 ever was, even after it came back from RPM. No offence boys. I just like the 6060. And I would say within less then 5 miles of driving it is back to normal. Then again it rarely gets below 32 down here.

Wes Burmark 12-04-2008 12:31 PM

Re: '08-'09 transmission TSB
I have had a similar experience with my 08 Z06. The 1 to 2 shift grinds when cold. The easiest way around it is to shift 1 to 3 and 3 to 5 until the car warms up. THen all is well.

Lawdogg 12-04-2008 02:50 PM

Re: '08-'09 transmission TSB
I've driven my '07 with the old style tranny in 10 degree weather. It shifted very stiff on the 1/2 shift, but no grind. Guess GM should have left well enough alone.

Tony Skarbic 12-04-2008 05:34 PM

Re: '08-'09 transmission TSB
Nothing has changed since 1963. My 63 T-10 shifts the same way.

4wheels 12-04-2008 11:30 PM

Re: '08-'09 transmission TSB
By the number of people experiencing similar shifting problems, GM will probably release an updated service bulletin widening the ambient temperature range where this occurs to "70 degrees F and below" in an attempt to get out of fixing anything...

agentf1 12-05-2008 04:17 PM

Re: '08-'09 transmission TSB
Reading this makes me want to keep my 02 Z06 which I might add perfoms flawlessly. :screwy:

Typical GM response.

zeta08 12-06-2008 07:49 PM

Re: '08-'09 transmission TSB

Originally Posted by Wes Burmark (Post 1257596)
I have had a similar experience with my 08 Z06. The 1 to 2 shift grinds when cold. The easiest way around it is to shift 1 to 3 and 3 to 5 until the car warms up. THen all is well.

nice idea, can't believe i never even thought of it :screwy:

zeta08 12-06-2008 07:56 PM

Re: '08-'09 transmission TSB
I like how they say you have to drive 15 miles. After 15 miles at any speed the tranny is quite a bit hotter than 32F, proving that the ambient temp when the car is cold need not be so cold as 32F to effect this issue...indeed.

Thanks for the initial post.

Wes Burmark 12-07-2008 11:05 AM

Re: '08-'09 transmission TSB
Once the transmission has had a chance to warm up it shifts great. This is the first stick shift car I have even owned that I will not have to rush out and replace the shifter. It too, performs great. I'll live with the need to let the trans warm up. Wish I could say the same about the lack of comfort and support of the seats...

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