soap
Forum Member
i use to drive my car everyday with a c4 and a 4.10 gear. no issues with it, at 75mph the car would be at 3100rpms.
Unless you had some wacky gears in your C4.....75mph/4.10 gears and a 1:1 final drive ratio will turn 3700rpm with a 28" tire and 3500rpm with a 30" tire. I doubt you were running over a 30" tire.
--Joe