Built to Hold
Build guides, transmission tech, and install notes from the Gearstar shop floor. Every unit we ship is assembled by one builder, matched to your combo, and dyno-tested before it goes out the door. This is where we show the work: what holds, what grenades, and how to spec it right the first time.
Gearstar Dyno Tests
Gearstar performance transmissions knows the importance of getting it right the first time. For this reason, all Gearstar transmissions are custom built, by...
4L70E Performance Transmissions Install
It hasn’t been an easy life for our in-house project, Blue Bomber, a 2011 Chevy Silverado with a supercharged 4.8L. We have flogged it on big tracks and...
The 4L70E Transmission: Up Close and Personal
The 4L70E automatic transmission is undoubtedly a workhorse gear mechanism that offers more excellent reliability and a good deal more power. Read on for...
Picking the Right Automatic Transmission for Your Street Rod
There was a time when automatic transmission had all kinds of unique names- Cruise-O-Matic, Hydra-Matic, Ultramatic, and the list goes on. But while he...
What Are the Different Types of Transmission Fluids?
Many fluids run through your vehicle, powering it in their little way to ensure you enjoy or have a smooth driving experience. One of the most crucial of...
Step by Step: 4L60E Overdrive Trans Swap
01| The Level 4 Gearstar 4L60E four-speed isn’t much larger than the three-speed TH350 that was original equipment in the ’69 El Camino of Roadkill’s...