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Flathead V8 to Ford C4 Auto Transmission Conversion Kit
Flathead V8 to Ford C4 Auto Transmission Conversion Kit

Flathead V8 to Ford C4 Auto Transmission Conversion Kit

3 Reviews | 14 Answered Questions
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Flathead V8 to Ford C4 Auto Transmission Conversion Kit
Flathead V8 to Ford C4 Auto Transmission Conversion Kit
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Part # 91028906
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Adapt your 1949-1953 Ford flathead V8 engine to a modern Ford C4 automatic transmission. This complete C4 transmission conversion kit is an excellent upgrade for early Ford drivetrains – the lightweight flexplate and torque converter does wonders for a flatheads throttle response and stop-and-go driving. This kit includes Speedways Street King Ford transmission completely remanufactured with heavy duty clutches, special shift kit, torque converter, engine adapter, special flexplate, modified 12-volt starter, hardware, and instructions.

  • For Ford C4 transmission application
  • Handles up to 450 HP
  • 2200-2600 rpm stall torque converter
  • Firm, crisp shifts from Kevlar bands and H.D. clutches
  • Street/Strip Valve Body - everyday street driving and weekend trips to the drag strip
  • Billet 6061 T6 Aluminum Pro Shift Servo - extends clutch and band life
  • Improved Lubrication Circuits - reduced heat/prolonged life
  • Chrome steel transmission pan
  • Transmission has a one year warranty

Note: Must be used with open drive rearend (not included). Cooler, shifter, and chrome dress-up parts are sold separately. Fill tube and dipstick are included.Also, the 6 gear planet is NOT used in this transmission.

910-28906 Instructions (PDF)

Item Details

for 1949-53 Ford Flathead V8


  • 1949-1953 Ford 8BA and 8CM Mercury Flathead V8 engines without integral bellhousing


  • 164-tooth flywheel included
  • 2200-2600 stall converter included
  • 12 volt negative ground starter included


All warranty issues should be addressed to:

Performance Automatic, Inc.
Attn. Harvey Baker
5119 Pegasus Court - Suite F
Frederick Maryland 21704

Phone: 240-439-4650 
Fax: 240-439-4873

Some parts are not legal for use in California or other states with similar laws/regulations

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What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • Speedway Ford C4 Street King Transmission
    Qty x 1
  • Flathead-C4, Adapt & Hardware
    Qty x 1
  • Flexplate, Flathead Ford to C-4 Ford Transmission 164 Tooth
    Qty x 1
  • 1949-1953 Ford Flathead C4/AOD Replacement Starter, 12V
    Qty x 1
  • Ford 289-351W C4-AOD Transmission Block Plate
    Qty x 1
  • Hardware kit
    Qty x 1

More Like This


Q & A

Videos & Articles
  • Tech write-up and a video of a Lokar shifter install on an automatic transmission.
  • Races can be won or lost at the starting line. Choosing the right torque converter can put you ahead of the competition. Speedway has all the basics to show you how to choose the right stall for your application.
    Learn More
  • Want to extend the life of your transmission and the ATF inside? This article discusses the merits of transmission coolers, both factory and auxiliary.
    Learn More

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