Upgrading Your 4l80 Input Shaft for Big Horsepower
If you're pushing any actual power through a GM drivetrain, you've probably spent several late nights stressing about your 4l80 input shaft snapping on the most severe possible moment. It's a common concern for a cause. The 4L80E transmitting is basically the "big brother" of the particular legendary TH400, and while it's built like a literal tank, even tanks get their weak areas. When you start adding the turbo, a huge stall converter, or a heavy trailer into the mix, that factory-hardened steel can simply take so much abuse before it decides to check out. ...