Dana 80's were in 5 spd trucks and 1 tons as far as i can remember.
ok so every truck that had a 5 speed weather it is a 2500 or 3500 has the same dana 80 in them
isnt a true 80 37 spline like the fords and all 80's in the dodges are 35 spline to my knowledge. dodge 80s are of the hybrid kind