I've been having this problem for quite a while but recently I can hardly put any torque on the system before it pops out of 4-lo. When you do manage to get some power through it and it pops out, it does not feel good....*loud bang* /forums/images/graemlins/1zhelp.gif My truck is an 81 K5 and it has a part time transfer case which I *think* is a 208. (the indicator says 2hi/4hi/N/4lo) Also, the case has never allowed me to put it in to 4hi. A mechanic I know says it sounds like an internal problem with the synchros but I'm wondering if I can just adjust the linkage? I think it may be the linkage because the indicator when in 2hi sits between 2hi and 4hi. Any thoughts on this? What else could it be?