I have been trying to find out more on the MM6. Here is what I found from some cadillac website:
Quote:
One-piece countershaft added for durability (MM6)
On the new optional Corvette Z06 package, a stronger single-piece countershaft replaces the two-piece countershaft. The 505-hp LS7 creates 470 lb.-ft. of torque, which required the stronger shaft for durability.
32-spline output shaft added for durability (MM6)
The output shaft was enlarged to a 32-spline unit, which is more durable than the 27-spline unit used in the standard Corvette applications. The rear differential was also increased in size from an 8.25-inch ring gear to a 9-inch ring gear and a larger pinion gear. The bias ratio on the limited-slip differential was increased to 2.5:1 from 2.0:1, and the differential side-cover mounting arms were made stiffer, as well.
Rear extension housing bolt pattern changed (MM6)
The bolt pattern for the rear of the case extension of the Six-Speed was changed for Corvette applications to match the same bolt pattern as the new six-speed 6L80-E automatic.
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