the final drives and transmission will be the same on a 4r compared to a 9u. Same as the pony, air cleaner and pinion clutch quantities. a 4r does not have a wet clutch so ignore that quantity. the injection pump and diesel engine crankcase will be very similar, but may vary as they are different on a 4r with the d4600 engine compared to the d-318 on the 9u.