This transmission was introduced in 2005 but see it more in the 2011 up Chevy and GMC ½ ton pickup, Tahoe and Suburban. We originally thought it was going to be a better transmission then the previous 4 speed 4L60E transmission. However we started seeing them come in consistently at 100,000 miles and usually before 120,000 miles.

The torque converter is what we see failing on most every transmission we see. It puts converter clutch material into the transmission, causing damage to the pump surface and pressure switches.

Tech Tip: When pulling hills, even when Not towing. You can use your tow haul button. This increases the pressure and delays the shifts. It can be turned on and off as needed. It can be turned off going down the hill to avoid harsh shifting and back on going up the next one. We feel this will help get some more miles out of the transmission.

Can the transmission be upgraded to help get more miles out of the next transmission?

The answer is Yes. As they have been out for a while. More and more upgrades have become available. We use a heavier duty converter as well as some internal upgrades to help make these transmissions last longer. As with all transmissions. We are always looking for a way to make them better and last longer.

We also offer a heavy duty 6L80E transmission for a truck that is constantly put through the task of towing heavy loads and used more as a work vehicle. This would not be needed for a vehicle that is used for mostly family use or occasional light towing. This has become our #1 transmission that we do and our technicians have done a lot of research and have excellent experience with them.

What signs are noticeable when they are starting to have issues?

Customers usually complain of a shudder under light throttle at approx. 30-40 mph and again at 50 to 60 mph. It can feel like running over speed bumps on the road. When it gets worse, it may be delayed after stopping and taking off or cause erratic shifting. This is usually accompanied by a buzzing sound that sounds like power steering when the fluid is low. It is recommended to stop driving at this point and have checked. They will quit moving a lot of times when it gets to this point and are often towed in.

Give us a call today!

Your experts on the 6L80E transmission

CTT Transmissions

(209) 551-4050

3424 Oakdale Road, Stuite 1, Modesto, CA 95355