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.

The 4L70E Transmission: Up Close and Personal

Gearstar Performance June 5th, 2021 6 minute read

The 4L70E automatic transmission is undoubtedly a workhorse gear mechanism that offers more excellent reliability and a good deal more power. Read on for...

Swapping a TH200-4R Into an Early Muscle Car for Easy Overdrive

Gearstar Performance November 16th, 2020 5 minute read

Would you like to know how to swap a TH200 4R transmission into early muscle cars for easy overdrive? If that is a yes, let us show you how to go through...

Ford 4R70W Transmission History and Evolution

Gearstar Performance November 2nd, 2020 5 minute read

The Ford 4R70W transmission history and evolution has been an interesting one. It began with more fuel-efficient cars, given the high gasoline cost to...

Top Signs It's Time for a Transmission Rebuild

Gearstar Performance October 19th, 2020 5 minute read

Keeping a close eye on the top signs it's time for a transmission rebuild will ensure the proper functioning of your transmission for a long time. It will...

How to Choose the Right Performance Transmission Fluid

Gearstar Performance October 14th, 2020 5 minute read

There are several automatic transmission fluids on the market today, which could make it a bit challenging to ascertain the best fluid for your car....

GM Transmission Recommendations for High Performance

Gearstar Performance October 7th, 2020 5 minute read

Here is our guide to the GM transmission recommendations for high performance to ensure you get the best automatic transmission for drag racing. You will...

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