The GM 4L80E transmission is a heavy-duty, electronically controlled 4-speed automatic engineered for demanding applications. Built from the legendary TH400 foundation, it delivers superior strength, smooth shifting, and long-term durability. With its robust internals, overdrive gear, and torque converter lock-up, it efficiently manages high torque loads and heavy towing demands. Compatible with many GM trucks, vans, SUVs, and performance builds, the 4L80E remains a preferred choice for those seeking unmatched reliability. Whether for commercial use or custom engine swaps, the 4L80E transmission provides consistent performance and minimal maintenance issues.