Drivetrain question.

RoukoSadra · Post by **RoukoSadra** » Fri Jun 19, 2015 10:59 am

Well I have a 318poly on a NP 435 trans up to a NP201 T-case to a Spicer 60 rear end on my 66 W200 and I was wondering how to figure out the gear ratios for this truck and what its top speed would be. Any help would be helpfull.

dodgeboykim · Post by **dodgeboykim** » Fri Jun 19, 2015 11:50 am

4th gear is direct and T case is 1 to 1 when in high. Top speed depends on gear ratio in diff plus diameter of tires and some math.

RoukoSadra · Post by **RoukoSadra** » Fri Jun 19, 2015 12:44 pm

I know it has 32" tires on it ATM IDK the gear ratio but know a good way to find out.

soopernaut · Post by **soopernaut** » Fri Jun 19, 2015 2:13 pm

See your build thread for your axle gear ratios.

RoukoSadra · Post by **RoukoSadra** » Fri Jun 19, 2015 4:32 pm

soopernaut wrote:See your build thread for your axle gear ratios.

So the tag says it has 4.10 gears and a 32" tire, would that get me 60mph if I have the motor tuned right?

kurt · Post by **kurt** » Fri Jun 19, 2015 5:31 pm

5000rpm = 116.14401858304298 MPH

http://www.rocky-road.com/calculator.html

PwrWgnDrvr · Post by **PwrWgnDrvr** » Fri Jun 19, 2015 9:05 pm

RoukoSadra wrote:
soopernaut wrote:See your build thread for your axle gear ratios.
So the tag says it has 4.10 gears and a 32" tire, would that get me 60mph if I have the motor tuned right?

Yup, 116 mph downhill, all day long!

712edf · Post by **712edf** » Sat Jun 20, 2015 7:43 am

On a giant treadmill maybe.

Bucky

marklein · Post by **marklein** » Sat Jun 20, 2015 9:25 am

Tire has to turn approx 630 turns in a mile, gear ratio of 4.10, means engine will have to turn about 2600 to make 60mph. This is theoretical, it never turns out perfect, but gives a good general idea. If you want it more precise, mark your tire, then mark how many feet it covers in one revolution. Divide that number into a mile, 5280 ft, then multiply that by the diff ratio, you will then be very close.

RoukoSadra · Post by **RoukoSadra** » Sat Jun 20, 2015 6:34 pm

A lot more complicated than I want it seems

vin · Post by **vin** » Sat Jun 20, 2015 7:22 pm

Did you check that there isn't still a little metal tag hanging from a bolt on the front or rear diff? It will say what gears if so. My rear was gone but front was there labeled 4.09 which means the rear is 4.10

RoukoSadra · Post by **RoukoSadra** » Sat Jun 20, 2015 8:42 pm

mine is labeled the same. 4.09 in front and 4.10 in back.

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