The 4L80E is a heavy duty automatic transmission that was introduced in the early 1990s. It is designed for use in rear-wheel drive vehicles with engines that produce up to 440 lb-ft of torque. The 4L80E is capable of handling up to 860 lb-ft of torque when equipped with an aftermarket reinforced output shaft.
The 4L80E has a reputation for being a durable and reliable transmission, but like all mechanical components, it will eventually wear out. Most 4L80Es will last between 150,000 and 200,000 miles before needing to be rebuilt or replaced. However, some 4L80Es have been known to last much longer than that, with some lasting over 300,000 miles.