I've always thought the steering box lube is the least critical in my truck. Thick enough so it won't leak out. 90W has served me nicely.

Transmission and rear end lube would be a different deal.


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.