Flathead V8 to Ford C4 Transmission Basic Adapter Kit
Flathead V8 to Ford C4 Transmission Basic Adapter Kit
Speedway Motors

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#91628901

Flathead V8 to Ford C4 Transmission Basic Adapter Kit

  • This kit allows you to put a modern AOD, C4, or C6 transmission behind your classic 49-53 Ford Flathead V8, giving it the old-school look with modern drivability
  • Kit includes the starter nose cone, flexplate, bellhousing adapter, transmission block plate, hardware, and detailed instructions for a trouble-free installation
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$582.99

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$593.96

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Product Summary

C4

  • This kit allows you to put a modern AOD, C4, or C6 transmission behind your classic 49-53 Ford Flathead V8, giving it the old-school look with modern drivability
  • Kit includes the starter nose cone, flexplate, bellhousing adapter, transmission block plate, hardware, and detailed instructions for a trouble-free installation
  • You have your choice of 157 or 164 tooth flexplate, for either a 10-1/2" or 11-1/2" converter bolt pattern
  • Cast aluminum starter snout ensures proper engagement of the starter gear with the ring gear teeth
  • Transmission block plate is laser cut from 16-gauge steel, and gold zinc plated to offer premium corrosion resistance

Comes as a Kit

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Key Specs

MFG. Part #91628901
BrandSpeedway Motors
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Speedway Motors 91628901 Details

If you have access to your own transmission and parts or you wish to adapt an AOD, Ford C-4 or Ford C-6 to a 1949-1953 Ford 8BA and 8CM Mercury Flathead V8 engines without integral bellhousing, this basic adapter set is what you need. Includes: starter nose cone, flexplate, bellhousing adapter and instructions. Choice of 157 or 164 flexplate. Use with 302-351W transmission. For Ford C4 and Ford C6 transmission application.

Item Details

Basic Hardware Only: Starter Nose Cone, Flexplate, Bellhousing Adapter, Instructions

Application

This kit uses C-4 transmissions from 1966-76 Ford passenger cars, vans and pickups with 289-302-351W V-8's and 250 6-cylinder engines (exl. 170-200 6-cyl applications). 

  • Fits 1949-1953 Ford 8BA and 8CM Mercury Flathead V8 engines without integral bellhousing
  • If the bolt pattern on the front of the torque converter is a 10-1/2" circle, order the 157 tooth version. 
  • If the bolt pattern on the front of the torque converter measures 11-1/2", order the 164 tooth version. 

Charts

Speedway Motors 91628901 Specifications

KEY SPECS
MFG. Part #91628901
BrandSpeedway Motors

Ratings & Reviews

4.8

17 Reviews

Overall Assessment

Customers appreciate the product for its quality, usability, and practical fitting, frequently describing it as a 'perfect fit' for their needs. Many buyers have used it as an effective upgrade for a different model, highlighting its versatility. They note the easy installation, with straightforward instructions that contribute to a hassle-free setup. Users also commend the included bolts, indicating an attention to detail in its practical features. Safety and durability are both praised, with mentions of a smooth ride once installed, implying a high performance level. Compared to other options, customers would buy this product again, setting it apart from competitors as a highly recommended choice.

Write A Review

4.8

17 reviews

5

16

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Most Liked Positive Review

5.0

Easy to Install Transmission Adapter Kit

The kit and instructions installed easily and fit the first time. I had no problems with fit and finish of the adapter kit. All the parts were called out in the installation instructions with exact measurements necessary for an error free first time fit. Great buy.

Most Liked Negative Review

1.0

Easy to use, great fit

This product is an easy to use adapter that is a great way to have a smooth ride with your old flathead motor.

Filter by Ratings

C4 Adapter to Ford Flathead.

5.0

9 months ago

Manny

Inland Empire California

Verified

Product worked as advertised. We'll work it.

Would Recommend

I would buy this product again

5.0

2 years ago

Winos Hilltop Hotrods

Dallas,NC

comes with everything needed to mount a C4 automatic behind a 8ba flathead. only thing you have to source is a ford starter & a torque converter. it comes with detailed instructions of how to measure and install as well as instructions on how to replace the starter snout.

Would Recommend

Have not use it but it looks like it's what I need to do the

5.0

3 years ago

Sparkey

Rhode island

Verified

I will let you know but it's looks and fit just what I needed

i like the fit ....perfect

5.0

4 years ago

stan

ELIZABETH ,WV 26143

Verified

GOOD UPGRADE FROM A FORDAMATIC TO AN AOD

Would Recommend

I would buy this again

5.0

4 years ago

Harrison

Blackwell, Ok 74631

Verified

I'm putting a c6 in a 41 Mercury with a 51 Ford flathead, I have the adapter and trans installed, but not ready to start it up yet. installation was not too bad

Would Recommend

Perfect fit! Fast shipping!

5.0

5 years ago

merckxford

Wisconsin

Verified

Installing an AOD in my hotrod will make it a nice cruise!

Would Recommend

Customer review image

I would buy this again

5.0

5 years ago

dan

Columbus Indiana

Verified

Bolts do come with it.

Would Recommend

still getting things together to install

5.0

5 years ago

Bobby Wright

Maynard mass 01754

Verified

goes together ok so far

Would Recommend

good stuff

5.0

6 years ago

sam

salem, OR

Verified

Flat Head to 4R70W Transmission

great value and workman ship super fast shipping

5.0

6 years ago

poe

gastonia,n.c 28052

Verified

my little flathead hot rod

Would Recommend

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Showing 10 of 17 reviews

Questions & Answers

27 Questions • 17 Answers

Which AOD transmissions will work with this kit? Talked to a transmission shop and they told me all ford AOD rransmissions will work. He suggested one from a f-150 or crown Victoria will work... is this correct?

by Cole Wicks

• 6 years ago

1 answer

View Answer

Hi, I am looking at purchasing Parts 91628901 and 91018017 and C1DZ-17271 Are these parts compatible for a 1951 Ford Sedan {Twin Spinner} Current motor is the original side valve and I am wanting to put in a C4 Transmission . Do you post to Australia? Could you please give me the total cost including postage. Thankyou David

by David

• 7 years ago

1 answer

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Do you know if there is a mini starter that would work with this adapter kit so I would not have to grind the block and starter to make it fit?

by Bob

• 7 years ago

2 answers

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How are you mounting the C4 trans to the crossmember? I have a C4 matted to a Flathead, I'm putting it in a 1950 Ford Custom. Do you sell a trans mount?

by Mark

• 7 years ago

3 answers

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Hi, I'm after the c4 basic adaptor kit. Do you freight to Adelaide, South Australia. Thanks.Misha

by Misha

• 7 years ago

1 answer

View Answer

Is there a kit to fit the c4 to a 59an block

by Jerry

• 8 years ago

1 answer

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will this kit work for an aod transmission

by lee

• 8 years ago

2 answers

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Hi, thinking about this kit you sell, will it fit a gearbox aod nr. RF-E2AP-7006-AA. Is it possible to get som drawings of the bolts to the adapter so i can se it fits to the gearbox? Thanks.

by Roy

• 9 years ago

1 answer

View Answer

I have a c4 transmission but missing the torque converter. Do you have a torque converter that works with this kit?

by Don

• 9 years ago

1 answer

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I want the kit except the flywheel, can i get the part# of all the ítems except the flywheel please.

by Lgamezm

• 9 years ago

4 answers

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Fitment

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

Customer Impersonation Script