I replaced my 4.57 with a 4.10. A real simple swap. I don't know about a 3.73 but the 4.10 gets me going fast enough (45-50 MPH for me) at a comfortable RPM.


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.