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.

4L65E Transmission Specs and Updates

4L65E Transmission Specs and Updates

Gearstar Performance 6 minute read

Here's an overview of the 4L65E transmission specs and updates to keep you informed of what this unit offers and subsequent upgrades to it. It's worth...

4L60E vs 4L80E Performance Transmission Differences

4L60E vs 4L80E Performance Transmission Differences

Gearstar Performance 6 minute read

A comparison of the 4L60E vs 4L80E performance transmission shows that there are clear differences between both units. Although they may have...

GM 4L80E Transmission – A Solid Performer

GM 4L80E Transmission – A Solid Performer

Gearstar Performance 3 minute read

When it comes to vehicles, these days, we all want maximum horsepower. The more the horsepower, the better the engine performs. However, it also has a...

Understanding GM 4L80E Transmissions: Earlier Models & Upgrades

Understanding GM 4L80E Transmissions: Earlier Models & Upgrades

Gearstar Performance 2 minute read

4L80E by General Motors is one of the most popular four-speed automatic transmissions out there. First introduced in 1991, these transmissions went through...

Performance Automatic Transmission Failure: 7 Mistakes to Avoid

Performance Automatic Transmission Failure: 7 Mistakes to Avoid

Gearstar Performance 6 minute read

Performance automatic transmission failure may not spring up from thin air. Rather, this failure may be caused by our own making due to certain mistakes. You may...

GM 4L80-E Transmission Swap Tips and Tricks

GM 4L80-E Transmission Swap Tips and Tricks

Gearstar Performance 6 minute read

GM 4L80-E transmission swap tips are needful for anyone looking to revamp the performance of their transmission. The same goes if your ride is used for...

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