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.
6 Long-Term Benefits of a Rebuilt Transmission
Is your vehicle transmission giving you a headache, and you're already contemplating replacing it with a brand-new one? Replacing a faulty vehicle...
4R70W Performance Fundamentals Guide
The 4R70W is a revised version of the famous Ford's long-running 4-speed AOD (automatic overdrive) transmission that appeared in the '80s. Experts...
6L80E Transmission Specs and Identification
The arrival of 6L80E transmissions – or Hydra-Matic 6L80 transmissions – on the automotive scene in 2006 showcased the considerable design change of the...
Rebuilding a Faster, Better TH400 in Almost Every Way
Rebuilding a transmission, such as the TH400, is not relatively as easy as changing your car filter or making an oil change. It is a challenge that will take a...
A Detailed Look at Today's High-Performance Automatic Transmission
If your AT experience in sports and muscle cars is limited to the three- and four-speed slushboxes of yore, let us say this: today’s high-performance...
C6 Transmission Upgrade Tips, Tricks, and Tech
Have you ever wondered if it's possible to upgrade your C6 transmission to meet modern-day expectations in terms of toughness and performance? Yes, it is...