ducati916

Im thinking about upgrading to 3.73 or 4.10/4.11. Will I smoke the tires any easier? Are these gears hell on the highway at traveling 65 or so?

mike c.

iTrader: (1)

i've had both 3.73's and now 4.11's w12bolt. the 3.73's are good and at 80mph i was on 1,900rpm's. the 4.11's are great with the m6 and at 70mph i'm on 1,800rpm's or so. with the 3.73's traction won't get much worse,but the 4.11's will fry the tires. the 4.11's will make the car feel 200lbs lighter. the 3.73's would be my choice if i did'nt have the $$$$ for a 12bolt. good luck to ya.

Slowhawk

iTrader: (12)

M6 cars should of came with 4.11's from the factory.They work great for the highway when I cruise at 90mph..
Yes,you will lose traction with them easier at lower speeds.

z98

But you'll be able to launch easier.

And you could run 5.13 gears at 65 mph and not even notice.

TWISTA TA

Slowhawk what rpm do you turn at 65mph with your 4.11's

mcflyz28

On street tires I haven't gone wot in 1st gear since my tune instant spin at any RPM, second gear is a little better but not much in stop light wars it's a bitch, now drag radials whole different story !!

ducati916

i have a th 350 what would rpm be like with 4.10 or 4.11 at 90 mph

itchygomey98

iTrader: (2)

That's going to depend on tire size. Assuming that your tires have 25.65 inches diameter (245/50/16's), here is the math -

tire circumference in feet = (25.65 * 3.14)/12 = 6.71 ft

rpm = (mph * final gear ratio * 88) / circumference in feet

rpm = (90 * 4.11 * 88) / 6.71 = 4851 rpm's
You'd be just under 5 grand at 90.
Now don't forget - 3rd gear in a th350 is 1:1, so you just enter in the rear gears as the final gear ratio. In an overdrive tranny, you'd have to know the last gear in the tranny (.73:1 for an example). Then final gear is .73 * rear end gear.

ducati916

sweet thanks