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Second, the maximum engine torque for 4T80-E is 305 lb-ft. Not so much more than 280 lb-ft for 4T65-E MN-7 model at GTP and Regal GS. And substantially less than the 350 lb-ft for 4L60-E. The maximum gearbox torques are 460 vs. 400; 670 for 4L60-E.
The third problem is weight (and size). The GTP transaxle weights 214 lbs (97kg), the Cadillac one - 295 lbs (134 kg). Huge difference.
The much stronger rear-wheel-drive transmission weights only 162.5 lbs (73 kg) - because it does not include the "axle" part.
All this information is easily available on Internet:
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