GM 4L60E and 4L80E transmission differences

GM's 4L60E and 4L80E transmissions differ significantly in their weight ratings, physical dimensions, and internal gear ratios. The 4L60E supports up to 6,000 pounds GVWR and is smaller and lighter, while the 4L80E handles up to 8,000 pounds GVWR and is larger and heavier. They also have different bolt patterns and fluid pan shapes. Both transmissions evolved from GM's Turbo Hydra-Matic family, with the 4L80E being an evolution of the TH400 and the 4L60E replacing the TH350.