if anyone is interested in a nv4500 swap, i highly reccomend it! i broke my nv3500 a few weeks ago. a 4500 is a COMPLETE bolt in, reuses 3500 clutch, flexplate, etc. np231 tcase bolts up as well. lenght is the same, everything. all you need is a 4500 trans from a 5.9 2500 and a bellhousing from the same truck.