The tranny is a 47RE and it has a 180Hp pump with a HX35 turbo. The transfer case can be either a 241DLD or 241DHD. There is a tag on the back of the transfer case that'll tell you what it is. 241DHD came in truck with snow plow prep and, I believe, 3500's. 241DLD came in 2500's w/o snow plow prep. Rear ends on an automatic are Dana 70 for a 2500 and Dana 80 for 3500. Open the hood and look at the underside of it near the latch. You should see a breakdown list of the 'packages' the truck came with.