What will it take to fix the TCC, if that'* the problem?

Dropping the trans or pulling the engine and swapping out the TCC. You may have stored codes that arent tripping the SES light. I suggest having it scanned with a TECH-2 or similar device that can get powertrain codes.

What part numbers will I need if it is the TCC that needs replacing?

Also, I found this:


http://service.gm.com/gmtechlink/ima.../TLaug04e.html

2000-2004
All Cars with 4T40/4T45E and 4T65E – Light On/Various Transmission Codes Stores. Check transmission 20-way connector for secure connection.
Don’t replace transmission, TCC PWM, VSS, PCS or valve body.
TSB 02-07-30-022B

2003
All cars with 4T40/45E, 4T65E and 4T80E – Code P0742.
Replace TCC PWM Solenoid.
Don’t replace transmission, torque converter or valve body assembly.
TSB 02-07-30-039C

I finally took a stephescope and listened. The alternator sounded fine. The supercharger was a little loud but I expected it to be louder. But I found two of the idler pulleys that were extremely loud. And the noise seems to be coming from their general direction. So I think I'll replace those first.

OK, I need part numbers for some pulleys. I've pointed out the noisey pulleys but the pulley at the upper right may need to be replaced also.

I also need the part # for the TCC PWM Solenoid and the TCC.