I'm guessing they switched from ball bearings to roller bearings is it's a whole lot easier (cheaper) to make perfectly round cylinders (rollers) than perfectly round balls. Years ago, a bearing "expert" on this forum even said if you have them, ball bearings were superior to the rollers.


1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.