I have a NP 249 transfer case for sale. It is in good condition and is in my jeep running now. I thought it was my Viccious coupling so I got a new Transfer Case and found out it was actually the OD gear set in my Transmission that is making the noise. Make me an offer on the Transfer case. I have found that the Vissious Couplers are about 400 alone. I did see someone selling one for cheaper on here you may want to look on here.
1998 5.9L Limited, 99 TL 1000s, 1995 Stingray 586zp