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I'm researching Tremec transmissions and so far the TR6060 MH3 is the best option, I can't see any other feasible option. GM already stated that the ZL1 will use the TR6060 MG9 so im not sure how this is going to work.
I also did some digging into Ford's Getrag MT82 to see if it could hold 600+ ft lbs. First let me say that the Getrag gearbox that Ford chose to go with is actually called the 6MTI500 on Getrag's site because Ford actually co-engineered the MT82 with Getrag specifically for the Coyote. Foreign transmission manufacturers rate transmissions a little different than US (Tremec) does. They use a maximum torque capacity or sustained torque rating instead of a maximum torque rating mostly because peak torque only occurs in one place in the powerband for a split second.
Ford's version of the 6MTI500 (MT82) is specific to the Coyote , although, the 6MTI500 is also used by Range Rover but has a 5.44 first gear ratio. The 6MTI500 was a 4 way collaboration to reduce cost which is why a brand new MT82 only cost $2500. The 6MTI500 was rated at 500nm or 369ft lbs of torque at a gross vehicle weight of 4250kg or 9350LBS!!!! (Gotta love those Germans). At that vehicle weight, the torque rating could be twice that in a vehicle that weighs 3800lbs or well over 750ft lbs... It is assembled in China (to reduce cost again).
I initially thought that the sustained torque rating alone was why Ford elected to use the Getrag but never figured in the vehicle weight as a major consideration factored into transmission production. I will continue to look at Tremec to see if the vehicle weights were excessive as the Getrag's was...
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