The OldKarKook web page on this subject is great. A real classic.

Is it a 4.11 (37/9 teeth) or a 4.10 (41/10 teeth) or did GM make both for the 67-72 3/4-ton?


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.