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I cannot find the official TR6060 MH3 maximum validated vehicle weight, if it follows the same guide lines as other Corvette Tremec's, it would have been tested at a 4000lb vehicle weight as was the MM6 and MZ6 but I believe those were used in LS1, LS2 and LS6's across a wide variety of GM vehicles. GM now has transmissions tailored to each engine, the M10 in the SS was tested at 430tq@3860lbs and the MG9 at 551@4255lbs. Seeing that GM now has Tremec build specific gear sets for each engine, it is possible that the MH3 is validated at 620tq@3400lbs which would make using the LS9 in the ZL1 IMPOSSIBLE.
Looking at the MG9's rating, if the ZL1 was to weigh a little less than the CTS-V the transmission was made for, it could produce a little more torque, maybe 15-25ft lbs more. If by chance GM had Tremec build the MH3 at a rated 4000lbs instead of 3400 then it is a possibility that the ZL1 could reach ZR1 numbers at a 4000lb curb weight, but since GM selected the MG9, I am more inclined to think that the ZL1 will be close to the 4255lbs minus about a buck for that "intended" extra GM was planning... say 566hp/561tq. Now with a possible 620hp/600tq+, 3770lb GT500/SVT Cobra on the way, it makes that previous proposal by GM kinda weak.
If I were GM, I would get with Tremec to see if they could get me a specific gear set for the ZL1.... RIGHT NOW.
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