Ok. So I picked up a early basket case 4430 (sn: 4430p 011616R) for cheap. It had the rear end blown out of it. It came with two rebuilt clutch packs and a salvage rear end from a big salvage yard ready to be swapped in. After getting it home I seen that the salvage rear was from a 4230. Same casting numbers on the housing but some of the internals are different. We found this out when we were cross referenced the part numbers for the bull/ring and pinion gear cage and sun gears that then slide into the planetary. All the part numbers are different. So I need a little help figuring out what to do. Should I swap out the new updated bullgear/ ring and pinion to the older one it calls for in the 4430 manual or just keep the rear end together and put in new sun gear, ring gear in the outer axle, and outer planetary? Or just buy a complete salvaged 4430 rear end. And forget about the 4230 rear and take it as a loss.. I've attached a couple pics of the serial numbers