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.

Qualities of a Bulletproof 4R100 Transmission

Qualities of a Bulletproof 4R100 Transmission

Gearstar Performance 6 minute read

The first electronically-controlled transmission from Ford was introduced in 1989 and named the E4OD (E = electronically controlled; 4 = Forward Gears;...

5 Tips for Choosing a Transmission Rebuild Kit

5 Tips for Choosing a Transmission Rebuild Kit

Gearstar Performance 6 minute read

One of the most challenging repairs anyone can make on a vehicle is rebuilding a transmission. A transmission is a complicated mess of small parts,...

GM Turbo 350 Transmission Fluid Types to Consider

GM Turbo 350 Transmission Fluid Types to Consider

Gearstar Performance 6 minute read

If you need to service your transmission, you must beware of the type of transmission fluid to use, especially for GM Turbo 350. This can be somewhat...

6 Tips to Boost Auto Transmission Performance

6 Tips to Boost Auto Transmission Performance

Gearstar Performance 6 minute read

A vehicle auto transmission is a complex mechanical system that can be expensive to replace when damaged. This cost is why utmost care is essential to...

Horsepower and Torque: The Difference

Horsepower and Torque: The Difference

Gearstar Performance 6 minute read

A vehicle's two top performance metrics bandied about by car enthusiasts are horsepower and torque. You will find them peppered all over every...

5 Causes of a Transmission Fluid Leak

5 Causes of a Transmission Fluid Leak

Gearstar Performance 6 minute read

Have you ever wondered why a puddle of red fluid always seems to appear under your vehicle magically? There's a big problem if you have noticed similar...

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