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Special Applications Driven Gear
Calculator

   

Drive Gear Teeth

 

Rear End Ratio

 

Tire Width:

 

Tire Height:

 

Rim Size:

 

   

Driven Gear Needed:

 

SPEEDOMETER DRIVEN GEAR USAGE CHART*

AXLE RATIO

DRIVE GEAR TEETH

6T

7T**

8T***

3.08

-

18

20

3.27

16

19

21

3.45/3.55

17

20

-

3.73

18

21

-

4.10

20

-

-

4.30

21

-

-

* - Chart only offers an approximated correct MPH reading when using stock sized tires (800-815 revolutions/mile). If non-stock sized tires are used, the Special Applications Driven Gear Calculator must be used to find proper a proper driven gear. (coming soon!)

** - Used in most vehicles with V8 and T-5 transmissions from 1983-89 and 1996-98 Cobra with T-45 transmissions.

*** - Used on 1990-95 Mustang V8 with T-5 transmissions and 1996-98 Mustang GT with T-45.

DRIVEN GEAR PART NUMBER CHAT

 

Driven gear teeth

Gear color

Part #

for
manual
transmissions

16T

Wine

C0DZ-17271-A

17T

White

C3DZ-17271-C

18T

Yellow

C0DD-17271-B

19T

Pink

C0DZ-17271-B

20T

Black

C1DZ-17271-A

21T

Red

C4OZ-17271-A

for
automatic
transmissions

16T

Blue

D0AZ-17271-A*

17T

Green

C7SZ-17271-A

18T

Gray

C7SZ-17271-B*

19T

Tan

C7VY-17271-A

20T

Orange

C8SZ-17271-B

21t

Purple

D0OZ-17271-B

* - discontinued

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