Curtis- It's your truck build it like you want it, unless someone gives you the money then you could give them a little in-put.LOL I also have 59 GMC 100 with a 270-three on the tree. It runs perfect. I understand your apprehenson about highway driving these trucks. At first I was lead to believe they all have low gears (4:10 or lower)in the rear end. Not so,my truck has orginal 3.07 in the rear end. So check the tag on the housing cover(if it's still there)or rotate driveline and count. Good Luck
