The 4L80E Transmission is a fully computer controlled transmission that comes bolted to the higher horsepower and torque trucks. It is the overdrive successor to the 3L80(better known as the TH400 for most of it’s life). It is significantly larger than the 4L60E and if you compare the cases side by side it makes the … Read more
This short guide is will hopefully help you diagnose simpler Allison Transmission problems. Allison Transmissions have been around for a hundred years and have set the industry standard for durability. The odds are pretty good that you’ll never find your way here, but if you did lets get this figured out! Limp Mode on … Read more
What are the major differences between the 4L60E and 4L65E transmissions? If there were a one-word answer to this question it would be strength. The 4L65E is manufactured to handle more torque than its counterpart. They have an identical looking case. For all intents and purposes the 4L60E became the 4L65E when GM upgraded some … Read more