Truck slant 6 np435 bellshousing

I tried to look this up for you in the factory literature but was unsuccessful. The NP435 is a heavy duty unit and likely used an 11" clutch with a 14? tooth flywheel. The typical Small block V8 uses a 10" clutch with a 130 tooth flywheel. There is a definite relationship between clutch size and flywheel size/starter ring gear tooth count. Wish I could be more certain of my info for you but wanted to urge caution in presuming they would interchange and function properly. Given your working on a 4wd I'd urge more research on fortrucksonly.com or a 4 wheel drive truck forum. Looking up replacement clutch's at a local parts house might give you an idea of what to look for as well.