I'm still kicking around a way to lower my rpms on the highway for my 67 coupe ! I know, I already got alot of flack here for wanting to do this ! I'm an old guy (73) living on social security so I can't spend a ton of money on a new top loader or an overdrive automatic. I have a friend with a complete 4 spd set-up I can get for little or nothing. My question is, would this lower my rpms at all ? Pretty sure I have 3.50 gears in the rear !