Bell Never Aligned

New 71 Dodges delivered out of Dodge Main in the Detroit area all had ATF in the manual transmissions. A friend and I campaigned a B modified Production 67 Coronet and used ATF in the rear axle and 833. It worked very well in the 833, shifted easier and faster and did no harm. If it made noise the open collectors masked it nicely. In the axle ATF was good for a tenth second and 4 MPH but the diff ran very hot and caused the ring gear teeth to crack at the root after 4 or 5 weeks, maybe 20 runs. The tooth surfaces looked OK though. The teeth never failed us because we were changing gear ratios often enough to catch them before they did. New 8-3/4 gear sets at Universal Transmission in Hamtramck (defunct now) were 40 dollars at the time. 833 3-4 crash box gears, blockers, and sliders were $59 a set. The parts came wire tied together, no boxes. Roller bearings and the pinion seal came the same way wired together. Origin of all of it was Chrysler Corp.
I've been using a 50/50 mix of 80-90 and 50W engine oil in my W150 service truck axles for 18 years now. It pulls a 4000 lb. trailer everywhere it goes and gets me an extra MPG here in northern Michigan, it rolls much easier when cold.