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.

5 Symptoms of a Bad Coolant Temperature Sensor

5 Symptoms of a Bad Coolant Temperature Sensor

Gearstar Performance 6 minute read

A coolant temperature sensor remains one of the most vital engine management sensors. Learn why and symptoms of a bad sensor.The coolant temperature...

545RFE Transmission Specs and Schematic

545RFE Transmission Specs and Schematic

Gearstar Performance 6 minute read

The 545RFE transmission is an electronically controlled unit that was great for its time until it was replaced bu the 65RFE and 66RFE. Read below for...

The Ultimate Guide to the 4L80E Transmission

The Ultimate Guide to the 4L80E Transmission

Gearstar Performance 6 minute read

The 4L80E transmission is an automatic transmission designed by General Motors. Learn more about this legendary transmission.The 4L80E transmission was...

Overview of the 4L65E Transmission

Overview of the 4L65E Transmission

Gearstar Performance 6 minute read

Gearstar - Overview of the 4L65E TransmissionThe 4L65E transmission developed by General Motors for GM trucks – but adapted for the Chevrolet Corvette – is an...

History of the 4L60E and How It Stacks Up Against the 4L80E

History of the 4L60E and How It Stacks Up Against the 4L80E

Gearstar Performance 6 minute read

The 4L60E is one of General Motors' most versatile and durable 4-speed transmissions. So how does it stack up to it's counterparts?The 4L60E – whose...

Overview of the 4R70w Transmission

Overview of the 4R70w Transmission

Gearstar Performance 6 minute read

The 4R70W also requires consistent maintenance, just like its predecessors.This way, you will have an incredibly powerful transmission.The 4R70W, a Ford...

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