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.
Building the Perfect AOD Transmission
There are simple, yet effective ways to build the perfect automatic overdrive (AOD) transmission through the use of off-the-shelf components and...
200-4R vs. 700R4 Transmissions: A Comparison
200-4R vs. 700R4 transmissions are two four-speed automatics that are always compared side-by-side for their similarities, yet unique differences. They may...
Nag1 Transmissions: 5 Things to Be Conscious Of
Are you driving a car that uses the W5A580 automatic transmission or do you intend to buy one? Then there are certain things to be conscious of when...
Manual vs. Automatic Transmissions for Off-Road Activity
Your choice between manual vs automatic transmissions for off-road activity is dependent on a number of factors. Each has its advantages and...
Getting Back to the Basics of Torque Converters
Cars have come a long way from not only offering high horsepower, low emissions, but driveability which was once a bone of contention. These days, fuel...
The Bulletproof Ford AOD Transmission
There is the Ford AOD (automatic overdrive) transmission on one hand, and the Turbo 400 (TH400), on the other. However, car enthusiasts may be quick to...