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.

Choosing the Right Stall Converter for Your Turbo 350 and Engine Combo

Choosing the Right Stall Converter for Your Turbo 350 and Engine Combo

Gearstar Performance 10 minute read

Stall speed is the engine RPM your converter allows before it stops slipping and starts driving the car. Put the trans in gear, hold the brake, open the...

Upgrading Your 4L60E Valve Body for Performance

Upgrading Your 4L60E Valve Body for Performance

Gearstar Performance 6 minute read

SUMMARY: Upgrade to a rebuilt valve body for firmer shifts, improved durability, enhanced control, and better performance for towing or racing...

Upgrading Your 6L80 Torque Converter: Performance and Benefits

Upgrading Your 6L80 Torque Converter: Performance and Benefits

Gearstar Performance 6 minute read

SUMMARY: The 6L80 transmission, a reliable 6-speed GM system, can develop performance issues due to its stock torque converter’s wear. Upgrading to a...

Why a 3200 Stall Converter is a Game-Changer for Your 4L60E Transmission

Why a 3200 Stall Converter is a Game-Changer for Your 4L60E Transmission

Gearstar Performance 6 minute read

A 3200 RPM stall converter (or torque converter) can enhance your 4L60E transmission’s performance for high-powered applications, whether that means...

Should You Modify Your 4L60E Valve Body? Pros and Cons

Should You Modify Your 4L60E Valve Body? Pros and Cons

Gearstar Performance 7 minute read

Modifying your 4L60E transmission’s valve body can enhance shift performance and extend transmission life but comes with risks such as installation mishaps, a...

What Happens If Your 700R4 TV Cable is Out of Adjustment?

What Happens If Your 700R4 TV Cable is Out of Adjustment?

Gearstar Performance 4 minute read

SUMMARY:Throttle valve cables manage the hydraulic pressure and shift timing of your transmission. When the TV cable isn’t in sync with your throttle, it can affect...

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