GMC Truck Forum banner
1 - 2 of 2 Posts

·
Registered
Joined
·
53 Posts
Discussion Starter · #1 ·
My message center has been occassionaly displaying "Service 4WD". The 1999 GMC NBS has about 185,000 km. It is sometimes hard to engage 4 wheel drive. What does this message mean? What needs to be serviced other than the oil level in the tranfer case? I had a leaking seal replaced about 5 years ago, but are there some wear parts in there that need regular maintenance?
 

·
Registered
Joined
·
5,528 Posts
Do you have a push button selectable 4WD or do you have a floor shifter? If it is push button, 90% of the time it is electrical. Of that 90%, it is usually the switch on the dash. Transfer case fluid should be changed by now, if it has never been done. I just got a look of what can happen when a transfer case goes bad.....not pretty.
 
1 - 2 of 2 Posts
Top