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1989 Mustang TKX Transmission Swap: A Stronger 5-Speed for the Fox Body

The Fox Body Mustang is becoming an increasingly popular platform for restoration and resto-modding, and it's easy to see why. It offers timeless style at an affordable price point. The Fox platform also has enormous performance potential for those of us who love to go fast. The 5.0L V8 and Borg-Warner 5-speed manual that came with this 1989 Mustang GT are a great starting point for tuning, but owner Gabe Flores — the Brand Manager here at Classic Industries — wanted performance on par with modern-day muscle cars. So, he teamed up with Mustang Hub Magazine and American Powertrain to install a Tremec TKX transmission that can hold even more power than the stock Borg-Warner T5.

1989 CHP SSP Mustang Enjoying Retirement from Active Duty

In highway patrol pony car parlance, SSP initially stood for Special Service Police when applied to the mighty 1982 Mustang. After evaluating a 1979 Camaro Z28 for an 18-month period, the California Highway Patrol asked The Ford Motor Company to deliver several Mustang notchback coupes for testing. The Ford Crown Victoria sedan was heavy duty enough for police duty, but it was underpowered and couldn't serve as a high speed pursuit vehicle. This is why the CHP had tested the Camaro Z28 and wanted to evaluate the Mustang. For whatever reason the CHP didn't select the Z28.

1987-93 Fox Body Mustang Notchback Quarter Windows - Shipping Now!

If you've ever owned or even considered buying a 1987-93 Fox Body Mustang, you know one of the biggest cosmetic issues with these cars is the dry-rot that attacks the quarter windows. These window assemblies are infamously surrounded by what is typically a faded, pitting, and often separating seal around the outer edge. 

Fox Body Mustang: Development, Concepts, and 1979-1993 Year Changes

From the 1979 model year through the 1993 model, the 3rd generation Ford Mustang spanned 15 years of production. Ford's third-gen pony car is more commonly referred to as a Fox Body Mustang after the unibody, rear-wheel drive platform that this generation Mustang is built upon. A total of 15 distinct Ford/Lincoln-Mercury vehicles were produced on the formidable Fox foundation, including the Ford Thunderbird, Mercury Capri, and Lincoln Mark VII. The Fox platform is the second longest running platform of Ford's illustrious production history, behind Ford's Panther body-on-frame foundation architecture that spanned 1978-2012, or 33 model years. Read on as we take a look back at Fox Body Mustang history.