[alptbird]

Ok I feel a little stupid for asking. but I keep hearing M6 or A12 I am asuming that is a transmission code but I look at my little silver plaque under my hood and it says M12 am I looking at the right thing? or am I mistaken on on what what that means? I have a 04 gto with a manual.

 

[CrabhartLSX]

Ok I feel a little stupid for asking. but I keep hearing M6 or A12 I am asuming that is a transmission code but I look at my little silver plaque under my hood and it says M12 am I looking at the right thing? or am I mistaken on on what what that means? I have a 04 gto with a manual.

I think you mean M6 and A4. It's not a code of any kind, just manual 6 speed and automatic 4 speed. aka T-56 and 4l60e/4l65e.

Where'd you hear A12? No such thing exists.

 

[alptbird]

I will take a pic and post it if you will be willing to take a look. but it says m12 on the badge it may mean something else but it is stamped in a dot matrix style under the hood on the right side on the core support just above the head light..
check tomorrowe I will have to get back to the house and get the camera out so you can see what I am talking about.

 

[C5ORGTO]

M12 is the transmission code for the 6 speed manual we have. The 2001-2004 Corvette Z06 had the M12 6-speed, and the standard C5 Corvette had the M6 6-speed transmission. So yes, our cars have the Z06 transmission. Everyone calls it an M6, because its a 6-speed. I'm sure the others will correct me if I'm wrong.

 

[05GTO]

M12 is the transmission code for the 6 speed manual we have. The 2001-2004 Corvette Z06 had the M12 6-speed, and the standard C5 Corvette had the M6 6-speed transmission. So yes, our cars have the Z06 transmission. Everyone calls it an M6, because its a 6-speed. I'm sure the others will correct me if I'm wrong.

:agree

 

[alptbird]

I can see clearly now!

Alright. very cool. that answers my questions.that M12 code was messing me up with everyone asking M6 or A4 but that is cleared up now. Thanks everyone.

 

[GTO Roper]

M12 is the transmission code for the 6 speed manual we have. The 2001-2004 Corvette Z06 had the M12 6-speed, and the standard C5 Corvette had the M6 6-speed transmission. So yes, our cars have the Z06 transmission. Everyone calls it an M6, because its a 6-speed. I'm sure the others will correct me if I'm wrong.

You are correct, Sir!!!
I believe the M12 is now the standard box for the C6 Coupes and Verts too.

Roper

 

[SloTymer]

Yea, that m6 thing was messin with me too. I was thinking maybe there was a split rear diff. mod that could be had. As it turns out, I was being had.:lol:

 

[CrabhartLSX]

M12 ok yeah that's different.

 

[Clueless]

Well this at least explains the "M12" one of our forum members has in his signature (I think it's S2Gordon--someone with a MBM GTO).

I've always wondered what that meant, but wasn't curious enough to ask :lol:

 

[Subdriver]

If you are interested, here are the differences between the M12 and MN6 gearboxes:

MN6 M12
1st Gear 2.66 2.97
2nd Gear 1.78 2.07
3rd Gear 1.30 1.43
4th Gear 1.00 1.00
5th Gear 0.74 0.84
6th Gear 0.50 0.56
Reverse 2.90 3.28
:cheers