Marky Dissod
Full Access Member
3.73, 275/65R18, 70MpH, 4L60's 4th = 1915RpM . . . Makes me miss my Caprice wagon with 3.42 & 235/75R15 . . .Well, I started out with 3.42 and cruising at around 1,750RpM and now just over 1,900. So 4.30 would be 300RpM more at the same speed.
Going to hear those extra RpM through the cab. If I were a kid street racing, maybe, but not now.
Use my calculator, it's more accurate!
4.10, 275/65R18, 70MpH, 4L60's 4th = 2105RpM . . . Soon as I find a 4.10 rear axle and a 4.10 front diff . . .
4.10, 275/65R18, 70MpH, 6L80's 6th = 2015RpM . . . Schidt. Just convinced myself. If I ever get a GMT900 with a 6L80, 4.10 - and I may never tow anything.
By then I'll be old enough to have suffered just enough hearing loss that I either won't mind or won't notice the extra RpMs through the cab.
