I've got an 86 K5 with a 305 v8, TH700R4 and an NP208. When I've got the 208 in 4wd(Hi or Low doesn't matter) after a short while I lose all power going to all the wheels. It m akes kind of a grinding/whiring sound then I just stop moving. The engine doesn't die, and when I put it back in 2wd it works fine. I was told by one person that the Tcase was just flat dieing and I'd need a whole new one. If thats the case I'm screwed because I can't afford that. And another person said it might need a new chain. Can anybody give me some ideas as to what the problem is? And can this Tcase be rebuilt(would it be worth it?). Thanks for any help.