I run an 87 GMC 1500 4WD (lockable hubs) PU with a 305. It has a THM700R trans and a NP208 T-case. Occasionally while driving in 2WD The T-case jumps out of gear. I have to come to a complete stop put the trans in netural. Shift the 4WD lever down to 4 Lo then back up to
4High. Then I can shift the trans back into gear and move on. It seems to happen on a longer drive like a hour or more. I had a dealer look at it and they couldn't get it to jump out. But it has happened to me 6 times now.So what is it? The transfer case? Are they fairly straight forward?
Appreciate some help. Thanks