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.
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...
Why GM, Ford Joined Forces to Develop 10-Speed Transmissions
The motoring world is full of competition, both on and off the track. If people aren't competing to be the fastest in speed, they're competing to bring...
Taking 700R4 Performance to Higher Heights
They say a car is the sum of its parts – if you take but one piece out, then a well-made racing machine just flat out won’t work. Racing rigs are built...