6 Speed Automatic

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Using the latest developments in drivetrain technology, TCI® has developed an innovative automatic transmission for Pro Touring, street and all-out race vehicles. Designed for GM SBC, BBC, LS and Pontiac applications, as well as Fords and Chryslers, the 4L80E-based TCI® 6x Six-Speed Automatic Transmission is a fully programmable transmission that gives you six forward gears (2.97, 2.23, 1.57. A 6-speed automatic transmission uses six different drive gears to give you the best combination of fuel economy and power, as determined by the manufacturer. Since the transmission is automatic, the car determines when it needs to change gears and does it for you-all you have to do is drive the car. Automatic transmissions are easier to use than manual transmissions, where you have to manually.

  1. 6 Speed Automatic Transmissions
  2. 6 Speed Automatic Overdrive Meaning
6 Speed Automatic

The 6L80 Hydra-Matic transmission is a 6 speed automatic transmission manufactured by General Motors. It was created to help GM meet ever more demanding CAFE regulations on their vehicles. By utilizing more gearing, the 6L80 keeps the car in it’s power band longer, improving the MPG of the vehicle between 4-7% (over the previous generation fours speed transmissions) depending on the configuration of the vehicle that it’s in.

The part of a clutch you would SEE is a the pedal, which is under the dash. Second, a 6-speed automatic means that it has 6-speeds. And it shifts automatically. You do not have to run through the. Designed for GM SBC, BBC, LS and Pontiac applications, as well as Fords and Chryslers, the 4L80E-based TCI® 6x Six-Speed Automatic Transmission is a fully programmable transmission that gives you six forward gears (2.97, 2.23, 1.57, 1.18, 1.00, 0.75) for quicker acceleration and increased fuel economy at cruising speeds and is capable of handling up to 850 horsepower.

It began replacing the 4L60E transmission in many vehicles starting in the 2006 model year. The 6L80E went mostly into large vehicles with V8 motors. For the most part, this transmission has been phased out by the 8L90E already, but is still in prodution.

Unlike the 4L60E and 4L80E, the 6L80 is not always referred to as with the E on the end because it’s been over 25 years since the last non electronic GM transmission has been in production.

6 Speed AutomaticOverdrive

The 6L80 was used in trucks, particularly in the GMT 900 platform. The exceptions to this would be the 2006-2014 Corvette, 2006 G8, 2010-2015 Camaro, and the Chevrolet SS. In fact, the only 2017 model year vehicle that still comes with this transmission is the Chevrolet SS.

6 Speed Automatic Transmissions

6L80E Specs

The 6L80 is a robust transmission and can handle a ton of power. In fact the input torque rating is 440 lb. and it can handle a total gross vehicle weight of 8,600 lb, which makes it a great transmission for LS swaps with no modification needed whatsoever.

It’s a longitudinal transmission (that’s what the L in 6L80E stands for). This means that it’s designed for rear wheel drive vehicles only. It has a line pressure tap for diagnostic purposes.

Here are the basic specs for the 6L80E:

Manufacturer: General Motors
Production: 2005+
Type: 6 Speed Automatic, 10-12.6 quart capacity (dependent upon application)
Max RPM: 6500
Input Shaft: Application dependent
Torque Converter Lock: Yes
Overdrive: Yes, 2 gears
Case Length: 23.5″
Outer Case Material: Cast Aluminum
Controlled by Computer: Yes
Dry Weight: 195 lb.

Wet Weight: 207-227 lb. wet

6L80E Gear Ratios

6 speed automatic transmissions

The 6L80E uses four under drive gears and two overdrive gears. It does not have a direct 1:1 ratio like the 4L80E and 4L60E, which is worth noting. The 6L80E’s gear rations are as follows:



6L80E Identification

There are two super easy ways to tell whether or not the transmission is a 6L80E. Which one you use is going to depend on whether or not the transmission is in or out of the vehicle. If the transmission is in the vehicle you can use the RPO tag in the glove compartment. If you know the RPO code for the transmission you are golden. It’s like where’s Waldo. Just keep scanning it until you find the one you are looking for.

GM Transmission RPO Codes:

6 Speed Automatic Overdrive Meaning

  • 6L80– MYC
  • 6L90- MYD
  • 4L60E- M30
  • 4L60E- M30
  • 4L60E- M30
  • 4L65E- M32
  • 4L80E- MTI

Every modern GM vehicle has one of these sheets in its glove compartment. Use it to verify the vehicle has a M30 4L60ENow, if the transmission is out of the vehicle (or if you don’t trust a sticker), the 6L80E has an 18 bolt case. That’s more than almost any other GM automatic transmission. It looks nearly identical to the 6L90. For all practical purposes, these two transmissions are completely interchangeable.

The 6L90 has a beefier set of gears and many internal upgrades. Like most GM automatic transmissions, the easiest way to tell them apart is by using the pan gasket. Conveniently, the main transmission that the 6L80E is going to be confused for all have a different number of pan gasket bolts. See the pictures below to help you tell if you have the right transmission.

They all look really similar, so make sure that you bother to count the pan gasket bolts, especially if you have an untrained eye.


That’s pretty much all that’s to it. If you have any questions that I may be able to help you with, drop a comment or contact me.

If Ford ran their performance development department like many other tech companies, they would have stopped trying to innovate many years ago after they captured the reputation as North America’s most trusted automaker.

But Ford isn’t satisfied with letting up, even in when it rides ahead of the pack. The new PowerShift 6-Speed Automatic transmission is just the latest of the many exciting advances from Ford.

The World Tour Comes Back Home

The PowerShift is big in Japan. It’s already taken Europe by storm. These two markets have traditionally loved manual transmissions, for both the smooth-shifting feel and greater fuel economy. Now the system is making a resounding first impression in North America.

The PowerShift transmission is currently available for both the 2015 Ford Fiesta and Ford Focus.

Two Manuals Combine to Make an Automatic

We’ll leave it to the accompanying video to explain the PowerShift in greater technical detail, but we’ll start with a short explanation.

The PowerShift 6-Speed Automatic Transmission is the result of two parallel manual transmissions working in tandem, combining through a dual-clutch mechanism to create the same effects as an automatic transmission. The result is a design that manages shifts between two gear sets, providing the feel and efficiency of a manual transmission, engine torque delivered at all times, and the ease of use as a manual transmission.

The Look of Innovation

So what does the shift column look like in the paradox of engineering, a self-shifting but manual transmission? It looks just like your basic automatic transmission, from Park and reverse, down to Drive. However, there is a little button toggle on the knob, thumb-side, allowing you to take greater control of your drive as you feel the need, ideal for navigating hills.

Watch the following insiders video from Ford, explaining the new PowerShift transmission in more detail.