Who has M12 gearing in a F-body?
03-08-2011, 12:10 AM
#1
Who has M12 gearing in a F-body? I am going to be getting my trans freshened up in my M6 fbody, and I asked to get the M12 triple/double cone coversion.. So I was told that if I like I can have the same wider gearing as the C5 Z06's/GTO's.
How many people in here have this trans gearing and what do you think of it?
The gear in my rear end is a stock 3.42. Just curious about peoples personal experience with it. thanks
How many people in here have this trans gearing and what do you think of it?
The gear in my rear end is a stock 3.42. Just curious about peoples personal experience with it. thanks
03-08-2011, 08:45 PM
#4
You guys have it backwards, the M12 ratios are closer then the t56. I have one that is waiting to be installed in my camaro, but mine is going to have 3.23 instead of 3.42.
[thumb]http://i255.photobucket.com/albums/hh125/TheEdgeOfTheContinent/Z06/C5_Transmission_Specs.jpg[/thumb]
[thumb]http://i255.photobucket.com/albums/hh125/TheEdgeOfTheContinent/Z06/C5_Transmission_Specs.jpg[/thumb]
Closer ratio refers to the spread between the first several gears, not the overdrives.
03-08-2011, 09:23 PM
#5
On The Tree
im planning on putting a m12 in my 2000 trans am as well. the tall first gear mite be over kill..with my 4.10s. also all we need to do is change out the shifter cup to a mm6 style and keep the fbody shifter correct?
03-09-2011, 09:28 AM
#7
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Have a M12 4:30 gears and I love it run a 28" tall slick and a 27" tall DR i'm in 4th gear 800' out. pulls 1.6 60's 11.5 @ 120mph 6400 thru the traps all motor.
Hate to do it but I'm wondering how much faster it would be with a stalled auto
Hate to do it but I'm wondering how much faster it would be with a stalled auto
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03-09-2011, 02:50 PM
#9
On The Tree
awesome. thanks for the clarification. i ended up getting this mn12 for 100 bucks was rebuilt at a gm dealer (close friend worked there) and the customer had orginally brought it in for i believe a second gear shifting concern. so they rebuilt the whole thing put it back in and the guy still wasnt happy so they put a replacemnt trans in..guy still wasnt happy but accepted it and waranty never called back for the rebuilt one. and it sat at the dealer for 6 months.so i offered 100 bucks and boom basically bran new trans. the one in my car has seen better days..running 11.4 @125 (26" slick)3rd gear is a bitch to shift into...so i was thinking mayb just put the mn12 in and see how it is.
03-09-2011, 03:31 PM
#10
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I know they are both t56, but allot of people call the f-body a t56 and the GTO/z06 tranny m12. I was thinking more about the M12 having more aggressive gearing, I got the terms confused.
Last edited by Empatho; 03-09-2011 at 04:38 PM.
03-09-2011, 08:55 PM
#12
Shifts the same. It's all about the different gear ratios. Like I said before it's basically the same as a regular T56 with a 3:90 rear end. It just moves out quicker in 1-3, 5, and 6th. Plus it makes 5th and 6th more useable on the highway than the regular T56 was in my Trans Am.
03-10-2011, 06:52 AM
#16
Shifts the same. It's all about the different gear ratios. Like I said before it's basically the same as a regular T56 with a 3:90 rear end. It just moves out quicker in 1-3, 5, and 6th. Plus it makes 5th and 6th more useable on the highway than the regular T56 was in my Trans Am.
That said, I swapped in a similar geared M29 trans in my 95 TA, and I love it. The only gearing difference that the M29 has vs the M12 is 5th and 6th are .80 and .62. I would much rather have the .56 6th gear than my .62 though for high mph highway cruising, but it does allow me to pass without having to drop down a gear or two as with my stock T56. As said, it does move out quicker in lower gears, and allows you to maintain the (somewhat) stronger 3.42's vs putting in a more breakage prone 3.90 for the same ratio. Later if you still wanted more gear you could just go up one to 3.73's and it would be like having an average of 4.20 rear gear for 1-3, without having to go to the tiny 4.10 pinion.
