Is it M6 or M12 - Pontiac GTO Forum
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post #1 of 11 (permalink) Old 04-30-2005, 10:58 PM Thread Starter
 
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Is it M6 or M12

Why does everyone with a manual transmission refer to it as an M6? Mine came with an M12 (according to the plate under the hood and the build sheet in the trunk). I know that M6s came in C-5 Coupes and Verts while M12s came in the Z06. I know the M12 had lower gearing and (I think) was beefer is some ways, so I would think having an M12 is a good thing.
Am I missing something?

2004 Pulse Red GTO M6 - New Era CAI, TB Bypass, CAGS, Custom Split Exhaust, SLP Sway Bar & Bushings, BMR Strut Brace, HID, Sans Spoiler, Sirius

2002 Quicksilver Z06 - A Few Upgrades

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post #2 of 11 (permalink) Old 04-30-2005, 11:40 PM
 
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M6 = Manual 6 speed.
A4 = Automatic 4 speed.


Jim
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post #3 of 11 (permalink) Old 05-01-2005, 12:09 AM Thread Starter
 
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Quote:
Originally Posted by FoMoGo
M6 = Manual 6 speed.
A4 = Automatic 4 speed.


Jim
I'm familiar with that part.
I was referring to the 2 different types of manual transmissions: the M6 and the M12.

2004 Pulse Red GTO M6 - New Era CAI, TB Bypass, CAGS, Custom Split Exhaust, SLP Sway Bar & Bushings, BMR Strut Brace, HID, Sans Spoiler, Sirius

2002 Quicksilver Z06 - A Few Upgrades

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post #4 of 11 (permalink) Old 05-01-2005, 12:25 AM
 
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Quote:
Originally Posted by diverdan
I'm familiar with that part.
I was referring to the 2 different types of manual transmissions: the M6 and the M12.
I know... but on every forum I am a member of... M6 and M12 as "names" never comes up... just the referance to the manual/auto.


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post #5 of 11 (permalink) Old 05-01-2005, 09:17 AM
 
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the vette trans while a 6 speed could never be used in any other car as it is in the rear of the vette so i think all the gto have only one trans they use unlike the vet. and zo6
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post #6 of 11 (permalink) Old 05-01-2005, 09:29 AM
 
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Quote:
Originally Posted by diverdan
I'm familiar with that part.
I was referring to the 2 different types of manual transmissions: the M6 and the M12.
M12 is the code for the GTO and Zo6 manual tranny,

MN6 is the code for the C5 and fbody manual tranny..

most people say M6 just like a lot say M5 for a 5 speed manual, and A4 for a 4 speed auto

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post #7 of 11 (permalink) Old 05-01-2005, 08:06 PM
 
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Quote:
Originally Posted by x3ro
M12 is the code for the GTO and Zo6 manual tranny,

MN6 is the code for the C5 and fbody manual tranny..

most people say M6 just like a lot say M5 for a 5 speed manual, and A4 for a 4 speed auto

(different gearing between M12 and MN6)
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post #8 of 11 (permalink) Old 05-01-2005, 08:48 PM
 
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Quote:
Originally Posted by diverdan
I'm familiar with that part.
I was referring to the 2 different types of manual transmissions: the M6 and the M12.
Mn6 and m12 are two different transmissions.My 05 is an m12. Same tranny that is in the z06. They are two different versions of the Tremec T-56. The m12 has shorter 1-3 gears an equal 1to1 4th and shorter 5th and 6th.

gear mn6 m12
1st 2.66 2.97
2nd 1.78 2.07
3rd 1.30 1.43
4th 1.00 1.00
5th .74 .84
6th .50 .57

A common misconception is that the Corvette 6 speed is a transaxle. The automatic is a transaxle, but the 6 speed is a seperate unit mounted in front of a differential. Our GTO's share the transmission and rear differential of the Corvette, with our cars having different half shafts. Our cars have the transmission mounted directly behind the engine, the Corvette has it mounted in the back.
The T-56 Tremec was used by Ford for the supercharged Cobra, and is used by Dodge for the Viper and SRT-10 trucks. GM used it in the F-Bodies, and now uses it in the Corvette, GTO and CTS-V.
It is basically unbreakable with less than 750 hp.
I just checked my 05 and it is an m12. The lower gears were probably selected to offset the weight.

Last edited by fergyflyer; 05-01-2005 at 09:03 PM.
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post #9 of 11 (permalink) Old 05-01-2005, 10:23 PM Thread Starter
 
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From the responses, I'm gathering that everyone is just using M6 as a generic term and that all manual GTOs have M12s.

Thanks for the responses

2004 Pulse Red GTO M6 - New Era CAI, TB Bypass, CAGS, Custom Split Exhaust, SLP Sway Bar & Bushings, BMR Strut Brace, HID, Sans Spoiler, Sirius

2002 Quicksilver Z06 - A Few Upgrades

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post #10 of 11 (permalink) Old 05-02-2005, 10:01 AM
 
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Quote:
Originally Posted by fergyflyer
Mn6 and m12 are two different transmissions.My 05 is an m12. Same tranny that is in the z06. They are two different versions of the Tremec T-56. The m12 has shorter 1-3 gears an equal 1to1 4th and shorter 5th and 6th.

gear mn6 m12
1st 2.66 2.97
2nd 1.78 2.07
3rd 1.30 1.43
4th 1.00 1.00
5th .74 .84
6th .50 .57

A common misconception is that the Corvette 6 speed is a transaxle. The automatic is a transaxle, but the 6 speed is a seperate unit mounted in front of a differential. Our GTO's share the transmission and rear differential of the Corvette, with our cars having different half shafts. Our cars have the transmission mounted directly behind the engine, the Corvette has it mounted in the back.
The T-56 Tremec was used by Ford for the supercharged Cobra, and is used by Dodge for the Viper and SRT-10 trucks. GM used it in the F-Bodies, and now uses it in the Corvette, GTO and CTS-V.
It is basically unbreakable with less than 750 hp.
I just checked my 05 and it is an m12. The lower gears were probably selected to offset the weight.
Actually, even the automatic in the Corvette is a conventional transmission, not a transaxle. It just has a different tailhousing, but it's still a plain old tranny.
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