Steeda Mustang Speedometer Recalibration Gear-Automatic-7 Tooth 4.10 Ratio 23 Speedo-83-98 10205S Hedman's 3-Bolt flange hedder reducers

Hedman's 3-Bolt flange hedder reducers are for use with Hedman Hedders fitted with 3-bolt gasketed collectors

Does not fit AODE/4R70W transmission

Flexible legs - the legs of the FLEX have the padding molded in eliminating the need for additional pads

Provides frame rail clearance when lowering your ride height

This gas pressure shock allows racer to change pressure to his/her preference

Steeda Mustang Speedometer Recalibration Gear-Automatic-7 Tooth 4.10 Ratio 23 Speedo-83-98 10205S Hedman's 3-Bolt flange hedder reducersMustang Speedometer Recalibration Gear Automatic 7 Tooth 4. 10 Ratio 23 Speedo 83 89 Fits 1983 1989 Ford Mustang with Automatic Transmissions. 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. Note transmission type, model and resulting drive gear. Cross reference with your rear end gear ratio to find the correct "recalibration"