Maybe I missed something but Classic Parts lists a 3.38:1 ring and pinion for the 55-62 trucks and a 3.55:1 gear set for the 47-54 vehicles. They are not the same.
Maybe Ecklers may have something new for TF trucks, but I don't think so. Be sure you are looking at the correct parts before you buy a bunch of stuff that won't fit.
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