Built to Hold

Build guides, transmission tech, and install notes from the Gearstar shop floor. Every unit we ship is assembled by one builder, matched to your combo, and dyno-tested before it goes out the door. This is where we show the work: what holds, what grenades, and how to spec it right the first time.

How to Choose the Right Level AOD Transmission for Your Ford

8 minute read

Choosing the right AOD transmission for your Ford isn't just about horsepower. It's about how you drive, what your car can handle, and what you expect from...

GM 4L70E Transmissions

Ryan Steele 6 minute read

Like most AODs at the time, GM 4L70E transmissions were designed with lightened materials to support better fuel efficiency, 4 speeds, and...

HGM CompuShift CSII Controller

Ryan Steele 1 minute read

COMPUSHIFT II is the latest generation transmission control system from HGM Automotive Electronics, Inc. COMPUSHIFT II operates automatic shifting, paddle...

GM 700-R4 and 200-4R Transmission Installation Instructions

6 minute read

PLEASE FEEL FREE TO CALL US ON OUR TECH LINE AT (330) 434-2757 BETWEEN 8:00 AM AND 5:00 PM EST IF YOU HAVE ANY QUESTIONS.Failure to read and follow these...

Ford AOD Transmission Installation Instructions

Ryan Steele 5 minute read

PLEASE FEEL FREE TO CALL US ON OUR TECH LINE AT (330) 434-2757 BETWEEN 8:00 AM AND 5:00 PM EST IF YOU HAVE ANY QUESTIONS. Please read instructions...

Mopar NAG1 Transmission Installation Instructions

Mopar NAG1 Transmission Installation Instructions

Ryan Steele 6 minute read

PLEASE FEEL FREE TO CALL US ON OUR TECH LINE AT (330) 434-2757 BETWEEN 8:00 AM AND 5:00 PM EST IF YOU HAVE ANY QUESTIONS. Please read instructions...