The Nv4500 is doable but it’s easier with a 1985 and later NP205. You’ll have to convert to a hydraulic clutch going that route too. The pre 85 205’s need a good bit of work to run the 32 spline input that the 4500 requires. The 4500 pretty much just bolts up to the late style 205 case.
I agree with Tim and Mike overall on this one… I do realize the bulk of this thread is several years old.
Here’s a little reading on the subject
https://ck5.com/forums/threads/np205...stions.253679/