Why don't you use that T-6060 I mentioned once (and started a thread about)? The one in the Supercharged LS3 ZR1 car can handle 620ft/lbs. MH3 is it's TRPO (Trans RPO?) code and it only came in the ZR1. Otherwise the CTS-V can do 560ft/lbs with RPO (also an exclusive trans).
Picture for the CTS-V version
Picture for the ZR1 version
As you can tell, if you used the ZR1 version, you'd need to get the CTS-V's bell and tail shaft housings. Here's the MG9 (CTS-V) spec sheet and the MH3 (ZR1) spec sheet

Alternatively, for the 07 T56 MM6 RPO(Specs and Pic) handles 470ft/lbs. (06, and some 07 models like for ZR1 and CTS-V only handle 400ft/lbs, which is why I'm giving RPO codes).

 

The one I'm getting is Guaranteed with a 1yr Warranty to hold 700hp/700tq I believe, and it has Brass Guides for the 1,2 Fork and the 3,4 Fork, Steel 3-4 Fork, Carbon Fiber Blocker Rings, Billet 3-4 Keys, ontop of the fact that it's pretty much a brand new Transmission.

I would love to have the T6060 Ratios, but I think mine will work good for the low cost of $1950.

 

I guess I will pick up the Z06 and store it until I find a LS6 or 7 to drop into it,,,,,

Thanks for the info guys!!

 

im tellin ya, your gonna have to buy certain parts regardless, like wiring, ECM, etc. I would honestly go pick up a 5.3 from a salvage yard for $3-400 and piece the rest onto it. Otherwise you can get a standard vette LS1 swung in there for cheap. I wouldnt worry about finding a LS6 or LS7, just get whats cheap and mod it later, youll be alot happier.

 

LS1 would definetely be an option,,,,,

 

Assuming it's just Less Motor, then he shouldn't really need any wiring or PCM for it. Even if it's a truck motor. Frankenstein is basically just what you said though, a truck motor, but a step further with better heads and any other stock parts. Like anyone with a Vette LS2 or 6 that upgraded cams, you'd be able to put that into any motor and have a very nice upgrade!

 

i hear u on that one man.. broke mine twice now

 

I've gone through 4 different builds.. it's the spinning down-shift when I get on it to pass someone..it'll break loose as it's downshifting, hit the tach a couple of times, then shift up, and then later the Tranny's comin apart..

Any Gen III Engine Longblock will go directly into that car without any modifications.

I'd build me a little LS1 383 Stroker and get a Cam in it, LS6 Heads and Intake, and tear some **** up..