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.
4L80E Direct Drum in Performance Rebuilds
In the hierarchy of critical components inside a 4L80E, the direct drum rarely gets the attention it deserves. Builders often focus on shafts,...
What Is a Billet Direct Drum? Strength, Design, and Why It Matters
If there were a popularity contest in the world of transmission components, the direct drum might not even get an invite. Most people don’t know it...
Valve Body Basics: What Does a Valve Body Do in a Transmission?
So, what does a valve body do in a transmission? It directs pressurized fluid to the right clutches and bands at the right moment. The transmission valve...
Transmission Cooler line fittings
For the first tech tip of the year, we are going to cover transmission cooler fittings. On our transmissions we mainly use male -6AN fittings on our...
4L60E Are They All The Same?
There have been several different versions of the 4L60E over the years. They started in the mid 1990’s and continued through the early 2010’s....
Unlock Peak Performance With Transmission Upgrade Parts
When building a high-performance vehicle, every component needs to keep up with your engine’s power, and that starts with your transmission. Stock units...