i have a 1991chevy silverado 1500 4×4 pickup having trouble locking in the four wheel drive ?

it wont lock in to four high why? what causes this and what can be done to fix it?

2 Responses to i have a 1991chevy silverado 1500 4×4 pickup having trouble locking in the four wheel drive ?

  1. dill July 4, 2010 at 3:06 pm #

    You should have a buss fuse for the 4 wheel. Check that first and if its blown just replace it. If its not the fuse it more than likely your transfer case it could be low on oil or just jammed up. Theres realy no way to check the fluid besides draining it and pouring the right amount of fluid back in. If that doesn’t do it your transfer case is probably gone bad.

  2. Bob S July 4, 2010 at 3:06 pm #

    it could be any number of things depending on your models fetures
    a vacume leek, a wiring problem, a tranfercase problem, linkage problem

    you are going to have to go through your systems one by one start with fuses and then go out an get a service manual and start hunting