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Description of  GM4L80E Transmissions: How to Rebuild & Modify

Learn how to rebuild the GM 4L80E transmission! As the successor to the venerable and popular Turbo Hydra-matic 400 (TH400), the 4L80E was the next flag bearer in GMs line of automatic transmissions. While serving as the smaller, lighter cousin to the 4L85E, the abundance of 4L80E transmissions manufactured between 1991 and 2013 ensures that these highly capable 4-speed overdrive units will be in service for years to come. Read more