Well, let's see.
1985 Suburban 3/4 ton, factory tow option, originally a 6.2, then 6.5, then 6.5TD, then 6.5TD low compression.....now '01 Cummins ISB 5.9 is in it.
NV4500 trans, mated to an NP205 xfer, mated to a 14 bolt FF in the rear and a Dana 60 in the front, both with Detroit lockers...