Product Summary

Ford Flathead V8, Many Manual Transmissions

  • Adapts a GM manual transmission to 1932 to 1948 Ford & Mercury Flathead V8, no other adapter needed
  • 48 Truck & '49-'53 Ford/Mercury engines require OEM 3" adapter bellhousing
  • For use with GM fork and bearing or hydraulic bearing and diaphragm clutch
  • Mounts common Muncie, Borg Warner, Saginaw and T-5 GM style manual transmissions
  • For use with GM-style clutch fork and bearing (our part #916-2915)

Key Specs

MFG. Part #91628914
BrandSpeedway Motors

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Now you can easily mount a modern, fully synchronized GM manual transmission to your early Ford or Mercury Flathead V8 engine! This is a great way to get better driveability and improved performance from your 1932-48 Ford or 1939-50 Mercury Flathead.

This aluminum adapter permits the use of most GM-style 3-, 4- or 5-speed Muncie, Borg Warner, Saginaw and T-5 manual transmissions behind your Flathead V8s. Adapter is used in conjunction with Flathead flywheel and a GM-style clutch fork and bearing (or Speedway bearing and arm kit 916-29510).

  • Mounts common Muncie, Borg Warner, Saginaw and T-5 GM style manual transmissions
  • For use with GM-style clutch fork and bearing (our part #916-2915)
  • Recommended for use with Borg & Beck or diaphragm-style pressure plate
  • Use with original flathead flywheel (re-drilling of the pressure plate bolt pattern may be required)

Learn more about using T5 transmissions with these adapter plates by reading our tech article.Adapting a T5 to a Ford Flathead V8.

Item Details

Uses Borg & Beck or Diaphragm-style clutch


  • 1932-1948 Ford Flathead V8s
  • 1939-1950 Mercury V8s


CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.


MFG. Part #91628914
BrandSpeedway Motors