Best C6 Transmission Rebuild Kits

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You’ve decided to rebuild a C6 transmission and you know you will need a rebuild kit. What are the best C6 transmission rebuild kits?

The best Ford C6 transmission rebuild kits are listed below.

  • TCI Automotive Ultimate Racing Overhaul Kit
  • ProKing Automotive Rebuild Kit
  • Oregon Performance Transmission HP Rebuild Kit
  • Transparts Warehouse Raybestos HP Rebuild Kit

When it made its debut in 1966 on the 1966 Ford Galaxie, the automaker had already achieved some success with the smaller C4 they had been using on inline sixes and V8s. Knowing that the old Borg-Warner cast iron transmissions would never cut the mustard with the larger motors the public was demanding, FMC decided to apply what they had learned to the larger, more powerful C6. The result was a transmission that would last over thirty years and is still considered one of the best heavy-duty automatic transmissions ever made.

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What Is The Ford C6 Transmission?

The C6 is a 3-speed automatic transmission built for heavy-duty applications from 1966 - 1996. The transmission was outfitted to many vehicles across the entire Ford, Lincoln, and Mercury lineups, including the Ford LTD, F-Series pickup trucks, and even the large V8 Boss Mustang (‘67 - 73).

The transmission was housed in an aluminum alloy casing which lightened it compared to the cast iron 2-speed transmissions Ford had used. The weight reduction (along with the new transmission) improved torque and towing ability almost immediately. Americans who needed more power at lower speeds appreciated the added lower gear, which helped them pull trailers on the farm or across the country as more families than ever hit the open road.

Ford dubbed the new transmission as the “SelectShift” Cruise-O-Matic, which highlighted the ability of the customer to select which lower gear to begin. This feature was welcome news for farmers who needed the added gear to haul loads, and it provided better traction for slippery roads or when customers needed to engine brake down a steep incline.

Although the C6 used the same Simpson planetary system, (which happened to be the latest transmission technology), it was not an expanded version of the C4. The transmissions have different components, so as you perform any transmission repair, know that the parts are not interchangeable.

The C6 was produced at the Livonia plant near Detroit until Ford moved the production to its Sharonville, Ohio, plant in 1982.

What Are The Best Ford C6 Rebuild Kits?

There are many C6 rebuild kits, so we tried to narrow some of the guesswork for you.

TCI Automotive Ultimate Racing C6 Overhaul Kit

TCI Automotive Ultimate Racing C6 Overhaul Kit
TCI Automotive Ultimate Racing C6 Overhaul Kit

This rebuild kit includes most of the performance clutches, gaskets, and frictions you will need to update and revamp your C6. The kit is designed for racing or heavy-duty applications like RV or towing with engines producing more than 450 lb/ft of torque.

When TCI first opened in 1968, it catered to automatic transmission parts primarily for drag racers. Yet, today the opposite is true. Most of their business is helping restorers build their classic cars, and they have a potent Mustang following. Their parts are reasonably priced, and built with quality in mind.

Based in a small community outside of Memphis, the company operates a couple of facilities in Ashland, Ms. They have grown to become one of the leading distributors of low-cost automatic transmission parts on the market today. TCI is a part of the Edelbrock family of companies.

The company offers a 90-day warranty on unused products (30-day on racing stuff). Fast delivery is free for orders over $50 inside the continental US.


  • Good history in racing and rebuilding modifications
  • Parts are quality, reasonably priced
  • Free shipping (over $50).
  • USA Company
  • Free Technical Advice


  • Most reviews are positive

For more information about the TCI Ultimate Racing Overhaul Kit, see the manufacturer’s website.

Pro King Automatic Transmission Rebuild Kit

Pro King Automatic Transmission Rebuild Kit
Pro King Automatic Transmission Rebuild Kit

This transmission rebuild kit features everything you might need for your install, including lip seals, gaskets, sealing rings, friction plates, pan gasket, washer kit, thrust washer kit, and steel clutch plates. Pro-King is a leading industry leader in automatic transmission parts and basic overhaul equipment. Their parts are made with high-quality materials, meet or exceed all OEM standards, and you can order these from the company directly, or find them almost anywhere auto parts are sold (Advance, Autozone, and even WalMart).

ProKing specializes in basic overhaul kits and has a free tech line that is open during the week (which is no help to weekend warriors). The website is a simple scan of their various catalogs and could be more helpful. ProKing carries about 20,000 different parts, so they will have what you need. (Just be careful that you match your vehicle and engine size correctly. The parts are quality and shipping can be within 48 hours to the continental states. In addition, they offer a 1-year warranty, although you have to jump through a few hoops to get it done.


  • Good Quality
  • One Year Warranty
  • Lots of SKUs


  • The website is simple - not very engaging
  • Tech Line needs to be open all week long
  • The refund policy is not clear

For more information about ProKing Rebuild Kits, see the manufacturer’s website.

For pricing information, check this website.

Oregon Performance Transmission C6 HP Kit

Oregon Performance Transmission C6 HP Kit
Oregon Performance Transmission C6 HP Kit

This is one of the most complete rebuild kits you will find on the market. The kit includes an adjustable vacuum modulator, bushings, durpene pan gasket, all rubber o-rings, rear bushings, metal clad seals, paper gaskets, and much more. The parts are stamped inside the US, and the company’s customer service is very helpful.

The Oregon Performance Transmission company operates out of Salem, Ore, and supplies parts from many manufacturers that are highly recognizable, like ACDelco, Raybestors, TransTec, and others. The company has been a leader in transmission assembly kits for over twenty years, (founded in 2001). They ship for free inside the US and it is usually 2 - 3 days.


  • Great Kit for the Price
  • Includes More stuff than others
  • Customer service is Top-notch
  • Excellent customer reviews
  • USA company


  • None

For more information on Oregon Performance Rebuild Kits, see the manufacturer’s website

Transparts Warehouse - Raybestos Ford HP Rebuild Kit

Raybestos is a leading contender for best rebuild kits. The company specializes in wet-friction and OEM transmission parts, and has been in existence since 1902. While Raybestos will make you go through Autozone, we prefer Transparts Warehouse. The kit includes friction plates, seals, nitrile gaskets and bushings.

Transparts Warehouse is a great resource to keep on speed dial. They are based out of Redding, Ca., and have been in business since 1955. The stock parts are very good quality, and purchasing was easy. Transparts also has a great selection of used parts, (although I wouldn’t recommend a transmission rebuild, always best to use new gaskets, seals and the like).

I loved the informative blog on the website, and they offer a 30 day return policy. Shipping is fast. They even have a rewards program, which is pretty cool.


  • US Company
  • Website is easy to use
  • Customer Support is good
  • Used parts selection sold separately


  • Returns have to be in unopened original
  • Restocking fee is 25%