I had the dealership replace my driver side hub assembly in September and now I try to use All Wheel Drive or 4 wheel drive high/low nothing happens light just blinks.

It worked befor they did this.. Did they mess something up?
thanks
-tom

What year, auto transfer case??

it is a 1999 and yes it an automatic...

Most likely not the the hubs are fool proof in this instance, a scan with the proper scanner will see whats what, sounds more like an electrical problem.

IVIr_Evil']I had the dealership replace my driver side hub assembly in September and now I try to use All Wheel Drive or 4 wheel drive high/low nothing happens light just blinks.

It worked befor they did this.. Did they mess something up?
thanks
-tom

Sounds like a "SINCEYA" problem. :lol2:
Since ya worked on my vehicle, now something else doesn't work.

Unless they replaced the left hub by removing everything on the right side of your truck, I doubt the hub replacement caused this.

Since it's the right hub, check the vac cable going from the vac actuator under the battery tray to the vac switch on the transfer case. They may have knocked the hose off its retainer and the engine burned through causing a loss of vaccume.