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.
4L60E vs. 4L80E: Which GM Transmission Is Right for Your Build?
The 4L60E vs 4L80E question usually shows up as a horsepower question. How much can a 4L60E take, and at what point do you need the bigger transmission?...
Inside Our Level 4 6L80E: As Featured in All Chevy Performance
The November 2026 issue of All Chevy Performance takes readers inside our shop to follow a Level 4 6L80E from bare case to finished transmission. Writer...
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...
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...