no this is the same problem i have. the problem is in the transfer case, or the differentials, not the transmission. the clunking forward and reverse could be slack in the driveshaft due the gears engaging in the tcase, or worn gears in the diff (not likely). ive torn apart my diffs many times and i just had my tranny rebuilt so the only thing left is the tcase. i brought truck to a close friend/tranny specialist practicing for over 15 years, and he told me there might be a problem with the chain inside the tcase, for the problem relating to the slipping feeling. i am in the same boat and i have taken my tcase off now im going to take it apart this week when i get a day off, i'll let you know the verdict.