how much does it cost to fix my 4 wheel drive?

There are so many different things that could be wrong it's hard to say. A transfer case could run$1500.00 or more. You need to get it looked at by someone who knows what they are doing.

First what is wrong? Transfer case, transmission, rear end, wheel bearings, drive train, front suspension, engine? Do it yourself with all new parts, (good reliable parts) and you can drop $25,000 for everything and go down from there if items are working. Also brakes and radiator should be looked at. Don't forget the fuzzy die.