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.
6L80E and 6L90E Transmission Specs and Identification
The 6L80E and the 6L90E are close enough that people mix them up constantly, and different enough that putting the wrong one in a heavy truck is an...
Sports Cars That Are Faster with an Automatic Performance Transmission
Some luxury cars with automatic transmission include the Lexus ISF, BMW M4/M5, Audi S6/S8, and Porsche Panamera, to mention a few. Since there are two...
6 Long-Term Benefits of a Rebuilt Transmission
Is your vehicle transmission giving you a headache, and you're already contemplating replacing it with a brand-new one? Replacing a faulty vehicle...
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...
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...
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...