I bought a GM Supermatic 4L70E and a stock 2006 GTO TC. The only bad thing is GM no longer offers a new TC for the GTO application. I had to buy a remanufactured part. GM part number 17803808. The stall is listed at 1800-2000 RPM.
I should be happy with this combination since I owned a 2006 GTO in the past and had not complaints with how the 2006 GTO drove.
Removed the transmission last weekend and found the fittings for the cooler lines in my old transmission would not fit. case fittings for the cooler line is larger for the 4L70E. Size was 9/16-17 the old transmission had 1/2-17. Still waiting for the correct fittings to arrive. Should get here tomorrow, so I will have a long weekend to get the new transmission installed.
I couldn't confirm in advance if the 4L70E Supermatic had a input speed sensor. It appears that it does by the pins that are installed in the connector. 15 pins are present, there are 13 for the older 4l60E. GM apparently does not use ISS in their retrofit transmission controller, so I was worried that GM wouldn't bother to install a ISS in their aftermarket transmission. Had this been a 13 pin transmission, my TCU could be reprogramed.
