Long time reader first time poster here...done tons of searching on the forum and outside sources but I can't seem to find an answer.
Working on my 89 XJ and I found out the 4 wheel drive works in 4 low but NOT in 4 high. I know that 90% of xj 4x4 problems are caused by vacuum lines but I don't think this is the issue here since 4 low definitely works and 4 high does not.
I pulled off the shift fork and everything is intact there. Since the 4 low is working I'm afraid it might be a more serious/expensive issue.
Any help, insight or links would be greatly appreciated.
on a side note.... where do i refill the shift fork oil from?