I don't think it would be an easy fix as the frames are totally different so the mounting would be also. The tranny would probably bolt up to the engine but the stick might not work in the cab floor. Those transmissions are pretty heavy compared to a PU tranny. The 2 ton cabs sit higher on the frame too so the floor hump would likely need much alteration.
Someone may have done however as anything is possible if you throw enough time and money at it. An OD 3 speed would work easier if you can find one.
