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.
Upgrading a 4L70E Transmission
The 4L70E is one of several GM-produced electronic automatic transmissions developed as a successor to the Turbo-Hydramatic line of transmissions, some...
Overview of GM's Stronger 4L65E Transmission
The 4L65E transmission is built for Chevrolet, as an improved iteration of the 4L60E, and a successor to the 700R4. Unlike its predecessors, the 4L60E...
200-4R Transmission: The Holy Grail of Power, Fuel Efficiency
If you are looking for a way to upgrade your classic muscle car’s Powerglide or TH350, then you would be hard-pressed to find a better answer than the...
Building a 4L60E With Performance-Friendly Gear Ratios
When adjusted with proper gear ratios and a set of the right aftermarket parts, the 4L60E can be just the high performance transmission you’re looking...
Let's Talk High Performance 4R70W Transmissions
The 4R70W is a Ford transmission, and generally considered an evolution to the AODE, a transmission that it is often interchanged with. Both are...
Installing Overdrive in an Early Model GM
There’s no doubting the air of Americana around a classic 50s-70s GM ride. In the golden age of American automobile manufacturing, we turned building cars...