I have converted many trucks over the past 10 years or so from 2pc to a 1pc shaft, from the 80's trucks to the newer 08's,
I know there are 2 part#'s, im not exactly sure which is the right # as per length, but yes if you only have 1.5" of slip in the transfer case that is kinda pushing it, and you could have a problem.
Make a mark on the slip and then drop the shaft and measure exactly how far it is in the case.
Also make sure it's in the case, not just the extra length dust boot.
I know there are 2 part#'s, im not exactly sure which is the right # as per length, but yes if you only have 1.5" of slip in the transfer case that is kinda pushing it, and you could have a problem.
Make a mark on the slip and then drop the shaft and measure exactly how far it is in the case.
Also make sure it's in the case, not just the extra length dust boot.