Gm auto track transfer case question

[oteps]

What did the shop replace? If im correct there should be the switch on dash, motor and a clocking ring on t case. My dad has a Tahoe that's in an auto electrical shop now because it goes into 4 hi when u start it up. Plus the dash gauges went crazy. THey said u should put it in 4 x 4 often and it will keep everything moving and working good.