[38 coupe]

1972 and older 9 inch axles are almost a bolt in to the F-1. They are simply heavier and not stock looking. The 9 inch housing is larger in diameter than the Dana 41 so your have to replace the u-bolts and bottom plate holding the axle in. The shock mounts are on the Dana 41 and are not on the 9 inch. Also, Dana 44s are still used in Jeeps. I doubt your flathead will break it.