- Gm Transmission Identification 4 Speed
- How Do I Identify My Gm Transmission
- Gm Transmission Identification Chart
- Gm Transmission Identification By Pan
- Gm Transmission Identification Codes
- Chevy Turbo 350 Transmission Identification Numbers
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.
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.
Automatic transmissions Early models. The GM Hydra-Matic was a success and installed in the majority of GM models by 1950. Through the 1950s, all makers were working on their own automatic transmission, with four more developed inside GM alone. Quality Reman Transmissions and Transmissions Parts for Ford, Chevy, Dodge, GMC, Jeep, Lincoln, Pontiac Olds and More. Affordable Prices. No Core Charge on Most. Worldwide Shipping. Transmission Depot Has Been Serving Our Local & Online Community for Over 30 Yrs. GM / Chevy - Transmission Identification Shop by your transmission. Please select the automatic or standard transmission button below. Then you should see your transmission model listed. General Motors has a wide range of automatic and manual transmissions! We carry everything from high performance rebuild kits for 4L8.
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.
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.
Gm Transmission Identification 4 Speed
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
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:
Gear | Ratio |
1 | 4.027 |
2 | 2.364 |
3 | 1.532 |
4 | 1.152 |
5 | 0.852 |
6 | 0.0667 |
Reverse | 3.064 |

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:
- 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.
How Do I Identify My Gm Transmission
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.
Conclusion
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.
See Also:
Chrysler 727
Chrysler 904, 60 and newer (3 speed)
Chrysler 904 Vehicle Applications
Ford C4, 65-96 (3 speed)
Ford C4 Vehicle Applications
Ford C6, 66 and newer (3 speed)
Ford C6 Vehicle Applications
Ford AOD, 80-91 (Overdrive)
Ford AOD Vehicle Applications
Ford FMX, 68-80, (3-Speed)
Ford FMX Vehicle Applications
GM Powerglide 62-73 (2 speed)
GM Powerglide Vehicle Applications
GM TH200, 76-89
GM TH200 Vehicle Applications
GM Turbo 350, 69-86 (3 speed)
Gm Transmission Identification Chart
GM Turbo 350 Vehicle Applications
GM Turbo 400, 65 and newer (3 speed)
GM Turbo 400 Vehicle Applications
GM 700R4, 82-92 (Overdrive)
Gm Transmission Identification By Pan
GM 700R4 Vehicle Applications
GM Turbo 2004R 81-90 (Overdrive)

Gm Transmission Identification Codes
GM Turbo 2004R Vehicle Applications
Chevy Turbo 350 Transmission Identification Numbers
GM 4L80E, 91 and newer (Overdrive)
GM 4L80E Vehicle Applications
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