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.

TH350 Transmission Identification, Decoding and Super-Tuning

TH350 Transmission Identification, Decoding and Super-Tuning

Gearstar Performance 6 minute read

The TH350 (Turbo-Hydramatic) transmission identification, decoding, and super-tuning are what sets it apart from other transmissions. Its identification,...

How to Update Your Vehicle’s Transmission Systems to Factory Specifications

How to Update Your Vehicle’s Transmission Systems to Factory Specifications

Gearstar Performance 2 minute read

An efficient transmission system is essential for the smooth functioning of any vehicle. When you start experiencing unusual sounds, odd odors, delayed...

What Is a Lockup Torque Converter?

What Is a Lockup Torque Converter?

Gearstar Performance 5 minute read

Have you ever wondered what a lockup torque converter, or when should a torque converter lockup? If you have, then let's explain each of these to you, and...

Upgrading Your Ford C6 Transmission for Modern Toughness

Upgrading Your Ford C6 Transmission for Modern Toughness

Gearstar Performance 6 minute read

You can upgrade your Ford C6 transmission to ensure it can meet the modern-day expectation of performance and toughness. This may be a classic ride, but...

Upping the Performance of Your 700R4 Rebuild

Upping the Performance of Your 700R4 Rebuild

Gearstar Performance 7 minute read

Improving the performance of your 700R4 rebuild comes with a basket-full of benefits. For starters... An upgrade will make your transmission powerful enough to...

Ready to Modernize Your Chevy 4L60E Trans?

Ready to Modernize Your Chevy 4L60E Trans?

Gearstar Performance 5 minute read

So, you've got a Chevy 4L60E trans and you think it can offer more power, speed, and even fuel economy? Then it's time to make it happen. You may have...

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