Why do you want a FORD T85 with non-syncro first gear???
If your truck has a three spd column shift now then it should be the Saginaw all-syncro three spd. You just need an OD version of what you now have and a new, shorter drive shaft.
SM 326 >>with the external bolts and bearings in the break drum.<<
That is usually described as a "
full-floating" axle.