My '78 trail duster has full time 4wd. the t-case selections are 4wd, hi-loc, 4 low, 4 low loc, or something like that. I'm wondering what the diff is between the choices, mainly 4 low and 4 low loc. It took alot to get in 4 low, and when i got it there, it seemed like it was in 2wd, but low. I guess I'm asking what kind of t-case it has, and what the different choices mean.