[b.sharp]

I've had the same problem in an 80's blazer and it was the reverse clutches slipping. All forward gears worked for a few days and then 1st and overdrive went out because they are in the same clutch pac. I believe I would ask him about looking at the clutch disks to see if they're worn or have any appearance of hot spots. That's just my two cents worth. I have never seen a transfer case not work in reverse and work in forword and I grew up with a dad and uncle that did a hole lot of 4 wheelin through you name it they'ld put their trucks through it. Dad had a '79 with 6" lift and 3" body lift with 44 ground hogs and would go about anywhere. He's the one they called when they had a truck stuck in a deep hole of mud or water. Man would I love to have that truck today (except for putting gas in it!!!)