If you are referring to the cckw, I would guess they are interchangeable. the 1.5 ton bellhousing is interchangeable with a 1/2 ton bellhousing from the same year. As for the coe bellhousing... couldn't even guess. I know the deco trucks all had the 3 tapped holes for the clutch and brake pedals to mount to. I guess interchangebility would depend on weather or not the pedals attached to the bellhousing. The coe may have used a different configuration due to engine location.