have a 1983 K-10 pickup that was converted to a 350 from the diesel, i do not know the transmission, but i do know that it has a np208c transfer case.

The problem started last week, i was moving my truck so i could load it up to go shooting, and when i got in to move it after letting it warm up for about 5 mins, i put it in drive and the truck would go about 10 feet and completely stop. i put it in reverse and it would back up, so i played around with it, checkin to make sure there was nothing blocking my tires, then i checked the tranny fluid and it was still full, reddish and did not smell burnt. so i tried to move it again and this time it was fine. so since my truck was having problems i decided not to go shooting. and when i was moving the truck back into my parking spot, there was a loud "clunking" sound that came from below, then a hard jerk then lots and lots of grinding. i shut the truck off, let it sit for about a half hour, then i went back out to see what was going on. i started the truck again, put it in drive and there was nothing there, no movement, no grinding no nothing, so i tried putting it in park, and there was the most awefull grinding noise i have ever heard, so once again i shut the truck off, had a few buddies come over to help push it into my spot. then i tried putting the transfer case in 4h, neutral and 4l and it did the exact same thing that it did in 2h.

so my question is, is the problem in my tranny or my transfer case? this is my first 4x4 so i need a lil help with it.

Any ideas?

Hey man I have the same exact setup (350 NP 208 and TH 350-tranny 3spd no overdrive) and I had the same problem you're having. Sounds like your problem is that the transfer case is gone-roasted. My issue was that the guy I bought my truck from ran the truck without transfer case fluid and I didn't check the level-stupid on my part. My bearing ended up being roasted and I had to have it rebuilt. Watch out mechanics love to rip you off since the transfer case is thought of as a black box no one wants to touch they'll take your arm and leg for it.
Hope this helps.-
Skyler

cool, yeah you are running the exact same setup, what tires do you have?

I've got 35 BFG muds. On my old rig that I blew up I had goodyear MTRs and I am much more pleased with the offroad capability that the BFG's provide.:D