Stuck in 4wd
1999 Chevrolet Tahoe

Stuck in 4wd

(1999 Chevrolet Tahoe)
After having a backyard mechanic install a new transmission the truck is stuck in 4wd. The transmission shifts fine but the transfer case seems to be stuck in 4wd hi. If I mess with the buttons it will go to 4wd lo but never 2wd. The 2wd button will press and I hear the servo motor turning and then hear loud banging twice but the truck stays in 4wd. The lights on the buttons blink but usually dont stay on.
Automatic Transmission Diagnosis
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