Originally Posted by VettenGoat

Thanks guys, I've been having the same inner dilemma. The 65 originally had 3:90s like Rukees, but they are long gone several owners ago and now it has a wrong 1971 rear in it with 3:23s. So I am still looking for a 65 rear and thinking about what ratio to use with the 421. Geetoguy is right, we're not kids anymore and gas isn't .35 a gallon so 3:90s are out. I'm tossing up whether to go 3:55s or 3;73s. Anyone running 3:73s? Thoughts?
Mike