My machine has a hydraulic motor driving into a sm465 manual transmission that is married to a NP205 transfer case, then drive shafts to the chevy axles. You could take a hydraulic motor and drive directly into a axle to make it move, add a motor spool valve and it will drive nicely.
Steel bushings made from DOM will work fine, no need to have the bronze, you can buy DOM at the final size and cut to length, turn square on your lathe. When you weld them in they will be tight, on mine I ran a 1" reamer through them. I actually welded a socket onto a straight reamer and ran them through with an impact. The reamer lasted through a bunch of pins and I still have it.
For pins I used 4140, cut to length and used. I didn't try to harden the pins but probably should have. I only have about 250 hours on my machine, but so far I can't detect any wear in the steel to steel places, or the steel and bronze joints. I expect all the joints to last as long as I do. Grease is you friend.
