Hello if you think about replacing the old diffs by new type to drive it extensively it will be hard to do ! I did it once on one of my M37 the rear is easy but the front is diffrent from the new types you will need to narrow the diff tube and buy a specific axle to fit in it or you will need to change the shakel to fit on the leaf spring pads .The distance center to center on the old diff leaf spring pads should be 29+/- and the new 32+/-.
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1953 Dodge M37 cargo
1953 Dodge M37 radio truck
1954 Dodge M37 costom
1954 Dodge M152 communication
If it doesn't exist anymore make your own
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