Chevrolet Repair: 4x4 trouble on 90 chevy k1500, vac system, transfer case

Question
my truck 90 chevy k1500 4x4 350 auto the truck will not engage into 4x4 so thinking it was the actuators so i change it put a new one in and it still does nothing could it be in the transfer case indicator or something else? thanks rodney

Answer
Hi Rodney... i will assume that you have electric over vacume system on that truck. if you have changed the solonoids check the shift module. If it is a vac system then check for vac before and after the solonoids and that the solonoids are switching the vac.