American Transmission Gear Ratios

Standard transmission ratios:

Richmond Gear R.O.D. (Richmond Overdrive) 6-spd manual

3.27, 2.13, 1.57, 1.23, 1.09, 0.76

4.06, 2.22, 1.57, 1.23, 1.09, 0.81 (optional 0.88)

3.01, 1.88, 1.46, 1.19, 1.09, 0.62

Richmond Gear T10 4-spd manual

2.43, 1.61, 1.23, 1.0 PN: 13040000070

2.64, 1.75, 1.34, 1.0 PN: 13040000069

2.64, 1.60, 1.23, 1.0 PN: 7021090

2.88, 1.91, 1.33, 1.0 PN: 13040000072

Richmond Gear (Doug Nash) 5-spd manual

3.27, 2.14, 1.57, 1.23, 1.00

Borg Warner T56 6-spd manual

3.36, 2.07, 1.35, 1.00, 0.80, 0.62

Ford Mustang 5.0l 5-spd manual1986-1988

3.35, 1.93, 1.29, 1.00, 0.68

1989-1994 5-spd manual

3.35, 1.99, 1.33, 1.00, 0.68

Borg Warner Close Ratio T-5

2.95, 1.94, 1.34, 1.00, 0.63 (0.80 optional)

Tremec 5-spd manual (aftermarket)

3.27, 1.98, 1.34, 1.00, 0.68 Model: 3550

3.18, 2.06, 1.39, 1.00, 0.65 Model: 3750S

ZF 6-spd manual (Used in '93-up Corvettes, including ZR-1)

2.68, 1.80, 1.31, 1.00, 0.75, 0.50

AUTOMATIC TRANSMISSIONS:

Power Glide 2-spd Automatic

1.82, 1.00

1.76, 1.00

Ford C-4 3-spd automatic

2.46, 1.46, 1.0

Ford C-6 3-spd automatic

2.46, 1.46, 1.0

Ford AOD 4-spd automatic

2.40, 1.47, 1.00, 0.67

AOD Wide Ratio 4-spd Automatic

2.84, 1.55, 1.00, 0.67

Ford AL4D (1987-1989) 4-spd automatic

2.47, 1.47, 1.00, 0.75

Ford E4OD 4-spd electronic automatic

2.71, 1.53, 1.00, 0.71

TH-700R4 (1991 Chevrolet)

3.06, 1.63, 1.00, 0.70 rev-2.29

200-4R (GN, Buick Regal,Cutlass,V6 F-body, etc)

2.74, 1.57, 1.00, 0.674