[Jonathan]

What size speedo gear do i need when i finally get around to installing my 3.73 gear?

[cnumartyr]

Originally Posted by Jonathan

What size speedo gear do i need when i finally get around to installing my 3.73 gear?

23 Tooth Gear....

[FoxChassis]

Not so fast.

What year is the transmission, or more specifically which gear (7 tooth or 8 tooth) is on the output shaft?

What size is the rear tires?

[Jonathan]

The transmission is a stock 93 5 speed, the output shaft is whatever stock is, and the wheels are the stock 16" ponies

[FoxChassis]

Size of the wheel doesn't matter, as tires with different overall heights can be put on the same wheel. What size is the tire?

Speedometer Drive Gear x Rear Gear x Tire RPM / 1000 = Speedometer Driven Gear

A '93 T5 has an 8T drive gear.

8 x 3.73 x ??? / 1000 = ??

[Jonathan]

The tires are 255/50/16

[pkstanger]

Product Details
Once you change the gears in your differential, you need a new speedometer gear to recalibrate your speedometer. They're inexpensive, and only take a few minutes to change.

These Recalibration Gears fit 1979-1998 Mustangs.

Instructions: Note transmission type, model and resulting drive gear. Cross reference with your rear-end gear ratio to find the correct "recalibration" gear for your application.

Manual Transmissions with 7 Tooth Drive Gear

1983-1989 T-5 OEM
Pre 1993 T-5 Aftermarket
1996-1998 Cobra T-45 OEM
All Tremec Transmissions
Manual Transmissions with 8 Tooth Drive Gear

1990-1995 T-5 OEM
1996-1998 T-45 OEM Except Cobra
Automatic Transmissions with 7 Tooth Drive Gear

1983-1989 Automatic Transmissions
Automatic Transmissions with 8 Tooth Drive Gear

1990-1998 Automatic Transmissions
375-C0DZ-17271-A
Manual 7-Tooth 2.73 Ratio / Maroon 16 Speedo Gear $9.95


375-C0DD-17271-B
Manual 7-Tooth 3.08 Ratio / Yellow 18 Speedo Gear $9.95


375-C0DZ-17271-B
Manual 7-Tooth 3.27 Ratio / Pink 19 Speedo Gear $9.95


375-C1DZ-17271-A
Manual 7-Tooth 3.55 Ratio / Black 20 Speedo Gear $9.95


375-C4OZ-17271-A
Manual 7-Tooth 3.73 Ratio / Red 21 Speedo Gear $9.95


392-STE-17271-D
Manual 7-Tooth 4.10 Ratio / White 23 Speedo Gear $15.95

375-C0DD-17271-B
Manual 8-Tooth 2.73 Ratio / Yellow 18 Speedo Gear $9.95


375-C1DZ-17271-A
Manual 8-Tooth 3.08 Ratio / Black 20 Speedo Gear $9.95


375-C4OZ-17271-A
Manual 8-Tooth 3.27 Ratio / Red 21 Speedo Gear $9.95


392-STE-17271-D
Manual 8-Tooth 3.55 Ratio / White 23 Speedo Gear $15.95


392-STE-17271-D
Manual 8-Tooth 3.73 Ratio / White 23 Speedo Gear $15.95


392-STE-17271-D
Manual 8-Tooth 4.10 Ratio / White 23 Speedo Gear $15.95

375-D0AZ-17271-A
Automatic 7-Tooth 2.73 Ratio / Blue 16 Speedo Gear $9.95


375-C7AZ-17271-B
Automatic 7-Tooth 3.08 Ratio / Gray 18 Speedo Gear $9.95


375-C7VY-17271-A
Automatic 7-Tooth 3.27 Ratio / Tan 19 Speedo Gear $9.95


375-C8SZ-17271-B
Automatic 7-Tooth 3.55 Ratio / Orange 20 Speedo Gear $9.95


375-D0OZ-17271-B
Automatic 7-Tooth 3.73 Ratio / Purple 21 Speedo Gear $9.95


392-STE-17271-J
Automatic 7-Tooth 4.10 Ratio / Black 23 Speedo Gear $15.95

375-C7AZ-17271-B
Automatic 8-Tooth 2.73 Ratio / Gray 18 Speedo Gear $9.95


375-C8SZ-17271-B
Automatic 8-Tooth 3.08 Ratio / Orange 20 Speedo Gear $9.95


375-D0OZ-17271-B
Automatic 8-Tooth 3.27 Ratio / Purple 21 Speedo Gear $9.95


392-STE-17271-J
Automatic 8-Tooth 3.55 Ratio / Black 23 Speedo Gear $15.95


392-STE-17271-J
Automatic 8-Tooth 3.73 Ratio / Black 23 Speedo Gear $15.95


392-STE-17271-J
Automatic 8-Tooth 4.10 Ratio / Black 23 Speedo Gear $15.95

[FoxChassis]

8 x 3.73 x 775 / 1000 = 23.16

A 23T driven gear isn't a Ford gear, so don't expect it to last forever. The pitch of the teeth is wrong and they're thin anyway. It may not even last 1000 miles.

[lxarlo]

Originally Posted by Jonathan

The transmission is a stock 93 5 speed, the output shaft is whatever stock is, and the wheels are the stock 16" ponies

your best bet is to get the red 21 tooth driven gear, and the yellow 7 tooth drive gear. the drive gear goes inside the extension housing, if you dont think you can do it, pick up a haynes manual and read that before you attempt it. its easy, and that will calibrate your speedo as close as youre goin to get with stock size tires. (225-55-16, 245-45-17)