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.
Is the Chevy 4L60E Transmission Good for Performance Builds?
Let’s discuss the Chevy 4L60E transmission for high-performance applications and explore its factory limits and reputation. We cover essential upgrades...
4L70E vs 4L60E: Specs, Internals, and Which One Your Build Actually Needs
The 4L60E and the 4L70E share gear ratios, a valve body layout that looks familiar, the same case family, and the same overdrive operation. Externally...
4L80E Upgrades: Top Performance Parts to Boost Your Transmission
Discover essential 4L80E upgrades, including the Gearstar Billet Direct Drum with oversized sprag, 300M input and main shafts, and supporting components....
How the Right 700R4 Torque Converter Transforms Performance
If you’ve ever finished a round of engine upgrades: camshaft, intake, headers, maybe even EFI, and then felt underwhelmed the first time you left a...
Essential 6L90 Transmission Upgrades
If there’s one thing GM got right with the 6L90 transmission, it’s that they built it to survive real work. Found behind heavy-duty trucks, performance...
4R70W Transmission Controller Explained
This guide explains the 4R70W transmission controller, the electronic brain that commands shifts and lockup. Learn why factory computer control fails for...