On a Gen III setup, DBW Throttle body and TAC module must match. i.e.- Corvette throttle body must use a corvette TAC, truck TB must use a truck TAC**. However, you can use a truck or corvette pedal with either setup. The only difference is in the wiring between the TAC and Pedal. If mis-matching a truck pedal to a corvette TAC (or vise versa) there are two wires that must be transposed. I dont have a schematic in front of me at the moment, but I can look it up. Typically, i use a truck TB and TAC, with a vette pedal. Sometimes my harness builder forgets to switch the two wires and it is inoperable untill I switch them. It will throw a DBW related code when this happens though, as pedal position is not reading in sync with TB and commanded pedal position.
**early 2001 / 2002 Tahoe and suburban DBW motors use a corvette style TAC, with a unique throttle body that looks like a corvette but with the motor on opposite side
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