1999 Chevrolet Blazer • 175,157 miles

Just had my vehicle in a mechanics shop with repairs to the transfer case output seal, lower control arm, lower ball joint, sway bar linkage, 2 valve cover gaskets, transmission filter and gasket replacement, left front axle, outer and inner tie rod ends, and now my blazer will not shift properly in automatic gears. Can you tell me why this is happening to me after I just got these components fixed?
July 19, 2013.

Check fluid level then have it scanned for codes athe wiring harness may have been disturbed or it's coincidental

Jul 20, 2013.