for those looking to swap in a TR6060 trans, I just ordered one of these. It should make using all the aftermarket T56 tranny cross members a bolt in.
www.RPhotrods.com
Here is what they had to say...
"To keep up with new transmission options Muscle Rods® has released two new transmission adapter brackets for the T-56 and TR-6060 transmissions, including the MG9 “high-torque” version of the TR-6060 behind the LSA engines in the CTS-V and ZL1 Camaro.
The adapter bracket for the Cadillac CTS-V T-56 as well as the late model TR6060 (non MG9) is laser cut, CNC bent and jig welded using 3/16” thick A36, steel is powder-coated black and comes with all necessary hardware. It is designed to adapt a standard transmission mount to the transmission using the factory bolt holes in the side of the extension housing and places the transmission mount in the correct location for our LS swap kits.
The adapter bracket for the MG9 high-torque TR-6060 is CNC machined from 6061-T6 billet aluminum, has a milled finish and comes with all necessary hardware. It is designed to adapt a standard transmission mount to the transmission using the factory bolt holes at the rear of the extension housing and places the transmission mount in the correct location for our LS swap kits. Polyurethane transmission mount is not included with the transmission adapter brackets, but is included with our LSx swap kits."