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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


1998-2010

78blackbird@thepontiactransampage.com
Feel free to drop me a note. * I am looking for some good articles for the third and fourth gen birds. If you have any that you would like to see on this site send them to me and I will post them on my site.     

  • The information in here is just an outline.
  • The author claims no responsibility for the info contained in these pages. 
  • If unsure of any tip or modification seek a professional for the job.
  • In some states this may violate pollution laws
  • Check with your state on the laws.
  • Not affiliated with Pontiac or General Motors