I am in the process of swapping in a 5.3L in place of my tired 2.5L and will be using the GM 4L60E transmission. My plan is to use the front half of a NP231C transfer case to bolt up to the 4L60E transmission, with the back half from the Jeep's NP231J. I read somewhere that if a person were to find a NP231C-HD in a salvage yard to grab it because they are hard to find. Well I found one, but after searching on-line I cannot find much information on what makes this such a good transfer case. Can someone explain? Thanks.