Throwback Thursday: Rebuilding A 4L80E Transmission

Can you believe it? The end of the week is almost here once again. It’s true when they say time flies when you’re having fun. Now that Thursday has hit us straight in the face and the end of the week announcing its arrival, we’re certain you are planning to work on your project this weekend. If so, maybe your plans have already been made? If those plans for spending some quality time in your garage include working on one of GM’s latest gear changers – the 4L80E, we can definitely help with that.

rebuild 4L80E

The 4L80E has a max torque rating of 440 lb.-ft. of torque, giving it a max-load capacity of 18,000 pounds. The gearing to move such a heavy load is a 2.48 first gear, 1.48 second, 1.00 third, and 0.75 overdrive.

In this edition of Throwback Thursday, we’ve opened the Power Automedia vault, and are taking a hop back to January 2015. This week, we’re checking out: Everything You Need To Know About Rebuilding A 4L80E Transmission. This week’s throwback goes in-depth to answer many of the questions you might have about this complex transmission.

The 4L80E is the successor to the tried-and-true Turbo 400 transmission, which was originally introduced to the General Motors platform in the 1960s. The 4L80E came thirty-years later in the 1990s. Doctor Steve of Doctor Steve’s Transmission Clinic told us, “There isn’t another transmission that has had the same design in production for 50 years!” These are four-speed transmissions outfitted with four forward gears and one reverse gear, are electronically controlled, and have a 25-percent overdrive gear.”

In the original article, we get into alot of technical specs about the transmission, what vehicles you might find one located, and how to identify one. Finally, you’ll find a lot of disassembly and rebuild tips for this electronic wonder, and you’ll have to check out the original article to get the full download about, Everything You Need To Know About Rebuilding A 4L80E Transmission.

About the author

Randy Bolig

Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles.
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