The GMC Yukon was equipped with the 4L60E in early models, the 4L65E in 6.0L models, the 4L80E in Yukon XL 2500 models, the 6-speed 6L80 in later models and the 6-speed 6L90 in the later model Yukon XL 2500. But they aren’t without their problems though, so let’s look at some of the most … Continue reading GMC Yukon Transmission Problems & Cost