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 & all Tremec transmission.
Applications:
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
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