Speedometer Driven Gear Calculator

Speedometer Driven Gear Calculator

Driven gear tooth count = Drive Gear tooth count x Axle Gear Ratio x

Drive Tire Revolutions per Mile (or 20168 / Drive Tire Diameter) / 1001

Enter Drive Gear Tooth Count *

Enter Axle Gear Ratio

Enter Drive Tire Diameter in inches,

then press enter

Recommended Driven Gear** Tooth

Count (Round to closest available)

Popular Transmission Speedometer Gear Tooth Counts

Transmission

TH350 (Chevy)

TH350 (BOP)

TH400

200-4R

700R4 (4L60)

C4/C5

C6

AOD

904

727

Muncie

Saginaw

Top Loader

T-10

T-5

T-56

TKO

Drive Gear Driven Gear

7 - 10

17 - 20

15 - 21

10 - 13

15 - 20

7-9

6-9

7-9

13

13

6-9

6-9

6-8

6&8

7-9

7-9

7-9

17 - 25

34 - 45

34 - 45

26 - 31

32 - 45

16 - 23

16 - 23

16 - 23

24 - 45

24 - 45

17 - 25

17 - 25

16 - 21

17 - 25

17 - 22

17 - 22

17 - 22

* The "Drive" gear is located on the transmission output shaft

and directly turns the Driven gear

** The "Driven" gear is usually located in the transmission

housing and directly drives the speedometer cable

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