Just think, there are folks on here that snipe at me about axle related failures. This is what you see when you have the spindles professionally serviced. Yes, I've seen cars with no cotter pin.
I have learned to never buy another 3500 lb axle and 10" drum brakes. They are designed poorly and will be a never ending source of wear and failures. 2-3/8" axle tubes are another thing on my no fly list.
It appears you will need 5200 lb axles and 12" brakes. You will have to measure and see what is available. Dexter did make me custom axles, hopefully they still offer that service if you need it. If for some reason you can't go to 12" brakes, then I would spend the bucks for disk brakes to avoid the poor 10" drum brakes.
Never use Chinese bearings, find Timken bearings that are made in USA.
A little of my information is available here with the usual sniping:
Brakes, etc.
