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 Early GM Style T-5 manual transmissions (Not Compatible With: later 1993+ S10/NV1500 units) 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).
- Fits 1932–1948 Ford and 1939–1950 Mercury Flathead V8 engines.
- 1948 trucks and 1949–1953 Ford/Mercury engines require the OEM 3" adapter bellhousing.
- Mounts common GM-style manual transmissions, including Muncie, Borg Warner, Saginaw, and T-5.
- Uses Throwout Bearing and Clutch Fork Kit (#916-29510) for GM transmissions, or can also use GM stock-style hydraulic throwout bearings.
- Compatible only with Borg & Beck or diaphragm-style pressure plates.
- Includes a pilot bushing adapter.
- Designed for use with the original Flathead flywheel; re-drilling 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
NOTE - If you are still using the stock rear axle assembly, an open-drive conversion will be required. Depending on the year and style of your differential, Speedway Motors offers several kits to assist with this conversion:
- Part # 919-1105 – 1935–48 Ford 6-Spline V8 Banjo Rear End Open Drive Conversion Kit (fits ’35–’48 rear axles with common 6-spline pinions)
- Part # 919-1106 – 1935–48 Ford 10-Spline V8 Open Drive Conversion Kit (fits ’35–’48 rear axles with common 10-spline pinions)
- Part # 919-1111 – 1928–31 Ford Model A Open-Drive Driveshaft Conversion Kit
Once the conversion is complete, a custom driveshaft will need to be installed. Speedway Motors offers Part # 910-383, a Universal Steel Custom Length Driveshaft Kit with a 3-inch OD. Other diameter and material options are also available to accommodate a wide range of applications.