My tires are 27 inchs tall & I run a 3:73 rear gear & I'm turning right at 2850. So I think your tach may be off a bit. I've driven my 73 GTO on the hwy for 3-4 hours & had no adverse actions running that speed for that length of time. Also I have a friend who had the original 4:33's in his 71 Judge who went from MI. to NY., mostly at 55-60 mph & drove it streight through. No problems if you don't beat on it.
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