Does anyone have good knowledge of interchangable parts? I have a NV4500 for a 2wd V8 application. Anybody know how much of this is interchangable with my 4wd diesel. Obviously the input shaft is different, as is the tailshaft and rear housing. But, is everything in between the same? I don't have any problems with my trans. yet, I just wondered if I should sell this 2wd unit or hang onto it for good spare parts! Thanks in advance, Greg