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I should clarify, 2500 rpm is about as fast as I ever wind mine up, *and only momentarily to get the revs up to prepare for the 3rd to 4th gear shift when going up a hill. Otherwise, 2200 rpm is about my max, and that gets me 55 mph in 5th with 46" tires and 3053A trans (GPS confirmed). Shifts...

A lot of this depends on an accurate measurement of speed too... I know speedo adapters were available to make the gauge read correctly with 395/85R20 tires (46"), but I don't know if there's a similarly easy method to correct the speedo for 53" tires. IMO, using your phone/GPS to track speed...

Maybe a bit off-topic, but I believe the real advantage with 53" tires is that they would couple nicely with the Spicer 3052 transmission. The 3052 had 5 nicely-spaced gear ratios. If your truck has the typical 3053A transmission, you probably notice one heck of a dip in RPM when you shift from...

Your tires appear to be Goodyear AT-2A's. Per Goodyear factory specs, "Maximum Speed Service" is 55 mph for both the 14R20 and 16R20 sizes... https://www.otrusa.com/wp-content/uploads/2017/07/Goodyear-OTR-Databook-3.pdf Porkysplace comment about "Brakes were state of the art in 1949" is just...