* Front: Likely a Dana 44 or a less common Chrysler 7.25" depending on options like 4x4 or 2 wheel drive.
* Rear: This is more variable. Common possibilities included various Dana models (like a Dana 60 for heavier-duty trucks) and Chrysler 8.75" or 9.25" axles. The specific axle will depend heavily on the truck's payload capacity and drivetrain.
To determine the exact axle type, you'd need to:
* Check the Vehicle Identification Number (VIN): Decoding the VIN can sometimes provide clues about the options and therefore the axle types.
* Look at the axle itself: The axle housing usually has casting numbers that can be used to identify the axle type. This requires some mechanical knowledge and access to the axle.
* Consult a 1972 Dodge D100 parts catalog or repair manual: These resources often have axle specifications based on the truck's configuration.
Without more information about your specific 1972 Dodge D100 (engine, trim level, and options), a precise axle identification is impossible.