I have found that by using this site, you can usually narrow down what is the culprit. Of course benchmarking your speed against a newer vehicle also helps.
http://www.prestage.com/carmath/calc_Gears.asp
- Jim Doran - Some Pics of my 65
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-Jim Doran-
1965 389 Tripower; 4 speed; convertible
2019 Tesla Model 3 Performance
2016 Chevy SS; Sold
2001 Toyota Tacoma 4x4
2008 Infiniti G35x
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