My '65 Valiant 273 convertible is perfect in every way but one. At freeway speeds the rpms seem really high. It's really quick off the line, but I am a cruiser not a racer. Did a previous owner install a high rpm differential? Or is stock like this? More importantly, (1) Can I install a differential that gives a lower rpm to all gears? (2) Is there an automatic transmission that will provide 4 or 5 gears and therefore a lower rpm for freeway speeds? (3) Will 17 or 18 inch tires help very much? I'm not a gear-head, but I love this car (except at 70mph) and want to take some trips in it while I can (just turned age 78). Can anyone advise? Thanks -- Gary
