The 4L80E is a truck automatic transmission that was introduced by GM in the early '90s. It basically uses many of the same internal components as the TH400 but has an overdrive Fourth gear and uses ...

It may not look it, but the D3 function found on your gear shift serves a surprisngly useful purpose separate from that of the regular D symbol.

Over the years, the trucks have certainly become more sophisticated. Take transmissions for example. At one time the only choices were "three-on-the-tree" or "four-on-the-floor" manual boxes. When ...