Re: Topping out at 55 mph?
I have my grandfather’s ‘63 GMC, long bed step-side, 3/4t, 4x4, winch (front), PTO, K1502E, w/ a 511 front/rear end. It tops out at about 60mph. I too have looked at all the options in an effort to attain higher hwy speeds and concluded that w/ all that would have to be done to achieve that, it’s simply not worth it, b/c #1 The expense and cascading effect on other components of the drivetrain, etc. and #2 there’s nothing like original equipment. I concluded I’d keep everything factory original, w/ exception of the split-rim wheels. Good luck. I look fwd to following your decision and course of action.
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