I am not too familiar with the correct years that I should look for in regards to a donor transmission. I have a good passenger car BB 727 so I'll be on the lookout for a 4x4 trans to get the tailshaft and other associated parts to swap. I know I'll need a trans that fits my 203 Full time case. I guess I could just look at the front end of the trucks, making sure they would have that large nut instead of a part time hub. The local yards out here have an online inventory list and even though it is often innacurrate, it does help some.