1LE (MM6) Gearing?

[blazzin1]

I was trying to find a chart comparing the differences between the 1LE (MM6) transmission gearing (1st thru 6th) compared to the regular SS (M10?) gearing. I know I've seen it somewhere on here before, but I can't find it now. Any help would be greatly appreciated.

Also, if I may ask an uninformed ignorant question. Let's say hypothetically, if both cars (SS and 1LE) had a 3.91 final rear end ratio, would there be any noticeable difference in "seat-of-the-pants" torque feel because of the different transmission gearing? I remember looking at those gear ratios before and thinking to myself that the 3.91's would actually feel more "torquey" (be more effective) in the SS. But maybe I have that backwards. Can someone confirm, deny, or explain? I'm confusing myself now!!!

[Higgs Boson]

mm6 is in the z06, same gearing. you can look it up and compare overll ratio in each gear by multiplying.

[SP33D]

MM63.911st Gear Ratio2.66410.422nd Gear Ratio1.7836.973rd Gear Ratio1.3025.094th Gear Ratio13.915th Gear Ratio0.7412.906th Gear Ratio0.5021.96M103.453.911st Gear Ratio3.0110.3811.772nd Gear Ratio2.077.148.093rd Gear Ratio1.434.935.594th Gear Ratio13.453.915th Gear Ratio0.842.903.286th Gear Ratio0.571.972.23

[cbass]

Originally Posted by SP33D

I was trying to find a chart comparing the differences between the 1LE (MM6) transmission gearing (1st thru 6th) compared to the regular SS (M10?) gearing. I know I've seen it somewhere on here before, but I can't find it now. Any help would be greatly appreciated.

In the Official 1LE thread.

[SP33D]

Sorry i pasted from an excel sheet i have. that didn't work..

[SP33D]

MM6 w/ 3.91
1st gear ratio: 2.66 10.42
2nd gear ratio: 1.78 6.97
3rd gear ratio: 1.30 5.09
4th gear ratio: 1.00 3.91
5th gear ratio: 0.74 2.90
6th gear ratio: 0.50 1.96

M10 w/ 3.45 w/ 3.91
1st gear ratio: 3.01 10.38 11.77
2nd gear ratio: 2.07 7.14 8.09
3rd gear ratio: 1.43 4.93 5.59
4th gear ratio: 1.00 3.45 3.91
5th gear ratio: 0.84 2.90 3.28
6th gear ratio: 0.57 1.97 2.23

[MikeOD]

MM6 ratios have been around since 1994 in the LT1 Camaro's if I recall correctly. They carried the same ratios into the production of the TR6060 version of the MM6 RPO.

[DanSS24]

One other thing to consider is the torque capacity. From gmpowertrain.com

Both the standard Corvette and the high-performance Z06 use the TR6060 designated as MM6, which is validated to 500 lb-ft of torque, while the TR6060 with the Z51 option features higher ratios and is designated as MZ6. It is validated to 430 lb-ft of torque. The ultra high performance ZR1 uses the TR6060 designated as the MH3, which is validated to 650 lb-ft of torque. The CTSv uses the MG9 version of the TR6060 validated to 560 lb-ft of torque. The Camaro uses the M10 gear set validated to 430 lb-ft of torque

[blazzin1]

Originally Posted by cbass

In the Official 1LE thread.

Am I missing it somewhere on the first page, or is it buried somewhere within the other 46 pages???

Originally Posted by SP33D

MM6 w/ 3.91
1st gear ratio: 2.66 10.42
2nd gear ratio: 1.78 6.97
3rd gear ratio: 1.30 5.09
4th gear ratio: 1.00 3.91
5th gear ratio: 0.74 2.90
6th gear ratio: 0.50 1.96

M10 w/ 3.45 w/ 3.91
1st gear ratio: 3.01 10.38 11.77
2nd gear ratio: 2.07 7.14 8.09
3rd gear ratio: 1.43 4.93 5.59
4th gear ratio: 1.00 3.45 3.91
5th gear ratio: 0.84 2.90 3.28
6th gear ratio: 0.57 1.97 2.23

Thanks so much for the useful info, this is exactly what I needed. So, does this tell me that the 3.91 gears have more torque in the MM6 transmission or the M10 transmission??? I still can't seem to understand the theory behind the numbers. Like on the MM6 above, for 1st gear, isn't it, for every one turn of the driveshaft, the rear wheels turn 10.42 times?? Or is that backwards???

Originally Posted by DanSS24

One other thing to consider is the torque capacity. From gmpowertrain.com

Both the standard Corvette and the high-performance Z06 use the TR6060 designated as MM6, which is validated to 500 lb-ft of torque, while the TR6060 with the Z51 option features higher ratios and is designated as MZ6. It is validated to 430 lb-ft of torque. The ultra high performance ZR1 uses the TR6060 designated as the MH3, which is validated to 650 lb-ft of torque. The CTSv uses the MG9 version of the TR6060 validated to 560 lb-ft of torque. The Camaro uses the M10 gear set validated to 430 lb-ft of torque

Does this mean that our regular ol' M10 transmissions could start breaking stuff at around 430 ft-lbs. of torque???

[DanSS24]

Originally Posted by blazzin1

Does this mean that our regular ol' M10 transmissions could start breaking stuff at around 430 ft-lbs. of torque???

I'm pretty sure the GM engineers are being conservative, but it is up to the consumer to take a chance. My 98 Camaro SS trans was only rated up to 400 lb/ft torque, but it handled well pass 450 when I upgraded it. And never had a problem, even with a 3000 stall torque converter. But then again, that was just an auto trans. Not sure about manual trans.

[toehead93]

I was going to post with the same question so thanks for dealing with this for me.

[DanSS24]

I should've said OEM rated at 400 lb/ft, which we all know they use engine crank. My torque was at the wheels. So you're looking at above 500 crank torque.

[SP33D]

Like on the MM6 above, for 1st gear, isn't it, for every one turn of the driveshaft, the rear wheels turn 10.42 times?? Or is that backwards???

10.42 engine revolutions for every wheel revolution.

[strokerls1]

Originally Posted by SP33D

MM6 w/ 3.91
1st gear ratio: 2.66 10.42
2nd gear ratio: 1.78 6.97
3rd gear ratio: 1.30 5.09
4th gear ratio: 1.00 3.91
5th gear ratio: 0.74 2.90
6th gear ratio: 0.50 1.96

M10 w/ 3.45 w/ 3.91
1st gear ratio: 3.01 10.38 11.77
2nd gear ratio: 2.07 7.14 8.09
3rd gear ratio: 1.43 4.93 5.59
4th gear ratio: 1.00 3.45 3.91
5th gear ratio: 0.84 2.90 3.28
6th gear ratio: 0.57 1.97 2.23

hmmm...it looks like the main reason they choose to use the MN6 was due to the upgraded strength for track use, and since the gear ratios are "longer", they needed to use the 3.91 rear gear to bring performance level back close to the SS. The ratios are pretty close between the 1le and the SS with the only major difference being 3rd gear to 4th gear...which just so happens to be where the SS falls flat on its face. I am thinking a 4.11 with the MN6 would be close to the 3.91 with the M10