According to the 1955 Chevy Truck Shop Manual:
SM420 4 speed: 1st 7.06:1, 2nd 3.58:1, 3rd 1.71:1, 4th 1:1
SM318 3 speed: 1st 2.94:1, 2nd 1.61:1, 3rd 1:1
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine