Model A

Ford Garage

Mitchell Synchronized Transmission

Shown below are pictures of the Model A transmission which is rebuilt by Mitchell Manufacturing using all new internal gears and 2nd and 3rd gear synchronizers. This transmission comes with a 15% higher 1st gear.

A 15% higher 2nd gear ratio is also available, together with the 15% higher 1st gear. The resulting transmission has many desirable similarities to the 1932 Model B transmission, without having to install a Model B engine and transmission in a Model A, together with the necessary wishbone and pedal mounting.

The resulting combined 15% higher 1st and 2nd gear transmission reportedly improves general drivability especially on flat ground or with a higher output torque engine.

Be cautious of increasing the only the 1st gear ratio to 15%. It is questionable if it is worth the cost just for the synchros, without also getting the improved 2nd gear ratio.

Shown above is the view of the reworked shift tower with the new forks and shafts as assembled by Mitchell.

These transmissions are quite expensive and are not an overdrive, but the revised gear ratios and synchronizers make the car much more drivable than the stock Ford gearing.

Contact: Mitchell Manufacturing

Mitchell Manufacturing
1157 Parker Street
Colusa, California 95932
(530) 458-4500
(800) 859-2088 Toll Free
Mitchell Manufacturing web site.


Drivability and Suitability ~ Recommended Combinations

Blue-shaded attributes are equivalent to the stock Model A.
Green-shaded transmissions, ratios, and attributes are preferred for improved drivability compared to stock Model A.
Yellow-shaded attributes are questionable, and Red-shaded are the least desirable.
Three Speed
Transmission
Rev 1st 2nd 3rd 4th % OD Optimal Drivability and Suitability ~
Recommended Combinations and Usage Notes
Stock Model A
1928-31

(200cid L4)
3.745:1 3.12:1 1.85:1 1:1 ~ ~
  • 4.11 rear axle in a heavy-medium weight car and/or hill terrain.
  • 3.78 rear axle in a medium-light weight car.
  • 3.54 rear axle in a light weight car and/or flat terrain.
Mitchell Synchro
15% 1st

(200cid L4)
2.71:1 1.85:1 1:1 ~ ~
  • 4.11 rear axle in a heavy-medium weight car and/or hill terrain.
  • 3.78 rear axle in a medium-light weight car.
Synchronized 2nd and 3rd gears.
15% Taller 1st gear ratio is similar to Model B.
Stock Model B
1932-34

(200cid L4)
3.383:1 2.820:1 1.604:1 1:1 ~ ~
  • 4.11 rear axle in a heavy-medium weight car and/or hill terrain.
  • 3.78 rear axle in a medium-light weight car.
The taller 1st and 2nd gear ratios of the Model B (and early V8) transmissions improves the drivability and shift points greatly compared to that of the Model A transmission.
When coupled with a 28% Mitchell driveshaft overdrive unit, this transmission approaches the "Goldilocks" solution for both low speed and high speed drivability, though without a transmission overdrive gear.
Mitchell Synchro
15% 1st & 2nd

(200cid L4)
2.71:1 1.61:1 1:1 ~ ~
  • 4.11 rear axle in a heavy-medium weight car and/or hill terrain.
  • 3.78 rear axle in a medium-light weight car.
Synchronized 2nd and 3rd gears.
15% Taller 1st and 2nd gear ratios are similar to Model B.
When coupled with a 28% Mitchell driveshaft overdrive unit, this transmission approaches the "Goldilocks" solution for both low speed and high speed drivability, though without a transmission overdrive gear.

More related information on Ford Garage:

  1. For more Model A & B related information, use the Site Search box at the top or bottom of this page.
  2. Model A 1928 Gear Shift Lever and Tower Assembly
  3. Model A Transmission Shift Lever Differences
  4. Model A Shift Lever Butler Finish Details
  5. Model A Shift Lever Spring Compressor and Removal Tool
  6. Model A Ruckstell Dual High Transmission
  7. Model A & B Gear Shift Lever Ball Variations
  8. Model A & B 1932 Los Angeles Olympics Shift Lever Ball
  9. Model A & B Rear Axle Gear Ratios
  10. Model A & B F-150 TOD Transmission Conversion ~ Tremec T170FT RTS

March 2003