1986 ram w100 won't go into 4wd. I believe the xfer case is fine. I'm suspecting something that affects the self locking hubs; but, I don't have the slightest idea how the vacumm system interact with the hubs, indicator light, and xfer case.
When shifting the xfer case, it feels like it is shifting properly into 4wd high. The 4wd idiot light does not come on though. And, I know that the front wheel is not getting any drive.
I'm suspecting something to do with the self-locking hubs. Perhaps vacumm? However, I don't have the slightest idea how the vacumm system works in conjunction with the 4wd. Or, what else could be causing this.