Re: Topping out at 55 mph?
I could bring my '66 305 1/2 Ton to about 70, but I agree, I never liked to and I wouldn't want to try to cruise at that speed. I believe I could cruise pretty comfortably at about 60.
The best way to achieve better cruising would be to find an old Overdrive (if you have a 3-Speed) or change the Rear to a Higher Gear, as far as staying original.
That said I'm not even sure Overdrive was offered in our year trucks, but the mid 50's Chevy cars had one that could be installed in your truck with some simple modifications, again if you have a 3-Speed. If you have a 4-Speed, it would be Rear Gear only and I believe they may be a little hard to find.
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Drove and owned many, but some of the more interesting ones were:
-'60 GMC 2500 Dump, 305 V-6
-'62 GMC 4000 Flatbed, 305 V-6
-'62 GMC 6500 Flatbed Dump, 478 V-6
-'67 GMC 7500 Box, 6V-53 Detroit
-'71 GMC 9500 Flatbed Dump, 637 V-8
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