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.
What Kind of Transmission Fluid Does a 4L60E Take?
The 4L60E has earned its place as one of General Motors' most successful automatic transmissions. You'll find it behind everything from daily-driven...
6L80E vs 4L80E: Which Transmission Is Better for Your Performance Build?
The 6L80E vs 4L80E discussion has been around for years and isn’t going anywhere. Both transmissions come from GM’s engineering pipeline, both have...
Which is better, 200R4 or 700R4?
The 200R4 vs 700R4 debate has been going on for decades, and for good reason. Both transmissions became popular during the rise of overdrive performance...
700R4 vs 4L60E: What To Know Before Upgrading
When it comes to GM overdrive automatics, few transmissions get talked about more than the 700R4 and the 4L60E. Both have proven themselves in everything...
6L80 Transmission 4x4 vs 6L80 Transmission 2WD: What’s The Difference
If you've spent any time planning a late-model GM swap or sourcing a replacement unit for a truck build, you've probably run into the 6L80 pretty...
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 Transmission vs 4L60E: Choosing the Right Upgrade for Your Build
If there was ever a debate that gets GM enthusiasts fired up, it’s the one over the 4L60E and 4L70E transmissions. Both are electronically controlled...