If you are hoping to go much over 55 with the original rear end all you can do is change the ring and pinion, which ain't cheap. Once you get it done you still ain't gonna do much better than 3.55:1, which when combined with the original tranny will get you over 55 but if you've got any kind of a commute and are hoping to have a daily driver it might not be what you are hoping for. Maybe there is someone in your area with the 3.55 gears who'll let you take their truck for a ride on the highway before you make up your mind about the front brake conversion. If you don't like the 3.55 gears you'll be going for a newer axel, and 5 lugs are easier to find than 6 lugs in the right width and gear ratio.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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