I recently picked up a 69 Ford 3400, power steering, 8 speed, 730 loader, live PTO, originally a backhoe but no longer and no diff lock or 3 point deck plate. I’m looking for a rear end swap because there is no rear hydraulic system in the current back end. Down the road from me is a 70 4000 with a blown motor I could pick up with some labor trading. It’s an 8 speed, live PTO, diff lock and 3 link. I know there are some big differences like 4.4x4.4 bore and stroke in the 4000, wet brakes, bigger rear end and so on. Because of growing up with a grandfather that had a Ford grave yard out back part of me says the two halves should go together with a different flywheel but that was 20 + years ago. Depending on what’s actually wrong with the engine in the 4000 rebuilding it is a possible option, especially if I’m way off about what it would take to swap the back end. Thoughts?