Hey, I hope you don't mind if I listen in here. I've got a '64 3/4 ton that I want to change the rear axle ratio on. right now the truck is screamin' at 55 mph; I'd like to go to a 3.56 or lower (numerically). I've heard that there's a good selection of ratios after '74 or so, but I don't know what all I'd have to change out to change the axle.
