Gearstar Performance

Custom Transmission Build Team

  • torque converter matching
  • dyno testing
  • transmission installs
  • GM performance automatics
  • Ford performance automatics
  • Mopar performance automatics




Gearstar Performance Transmissions has been hand-building high-performance automatics in Akron, Ohio since 1996. Every unit is assembled start to finish by one builder, matched to the customer's engine, gearing and intended use, then dyno-tested before it ships. The build team writes here about transmission specs, install procedures, torque converter matching and what actually holds up behind real power.

Installing Gearstar Performance Level 4 4L65E Transmission

Installing Gearstar Performance Level 4 4L65E Transmission

Gearstar Performance 1 minute read

Gearstar transmissions offer top notch quality whether in a muscle car, pro-touring beast, restoration project, daily-driver or modern performance machine....

Why a Gearstar 4L80E

Why a Gearstar 4L80E

Gearstar Performance 2 minute read

Why a Gearstar 4L80E? A 4L80E is a four-speed overdrive transmission that is the evolutionary counterpart to the TH400 three-speed transmission.  

Gearstar 200-4R Overdrive Transmission

Gearstar 200-4R Overdrive Transmission

Gearstar Performance 2 minute read

We needed a transmission that could do it all, and support any future engine upgrades without worrying about reliability. Plus, the Nova had to be able...

Upgrading GM 4L70E Transmissions Via Gearstar

Upgrading GM 4L70E Transmissions Via Gearstar

Gearstar Performance 3 minute read

Gearstar performance transmissions are all custom. Building each transmission with to the specific needs of the customer is important to Gearstar. We're...

Gearstar 4L60E Level Two Transmission - Installation

Gearstar 4L60E Level Two Transmission - Installation

Gearstar Performance 2 minute read

Gearstar transmissions are all custom. Building each transmission with to the specific needs of the customer is important to Gearstar. We're looking to...

Leisinger Race Team & Gearstar Performance Transmissions

Leisinger Race Team & Gearstar Performance Transmissions

Gearstar Performance 2 minute read

The Leisinger Race Team & Gearstar Performance Transmissions. Gearstar is the official transmission of Lesinger Race Team and currently the only race...

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