Where is the transmission control module in a 2006 Chevy Silverado z71

What is your question?

High rev when shifting from 1st to 2nd. Already replaced shift selnoids, filter fluid, mass air flow sensor. Also revs high when it downshift into passing gear. When it does shift it is a smooth shift still. Shifts better under slow acceleration revs higher under hard acceleration.

What makes this problem better or worse?

Under very low acceleration it shifts doo er

How long has your 2006 Chevrolet Silverado 1500 had this problem?

A few months