Between 1991 and 2009, General Motors’ 4L80-E transmission was used in some of the manufacturer’s most popular trucks and SUVs. Initially intended for use in mid-to-heavy-duty models like pickup trucks and large SUVs, the 4L80-E was based on the earlier TH400 transmission. The gearbox’s name is really a simple code used to identify its applications. It’s a four-speed (4) automatic transmission designed for longitudinally (L) mounted engines in vehicles weighing up to 8,000 pounds (80) and featuring electronic (E)
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