4L60E vs 4L80E Differences: Swap & Information

In Transmission by Magnus Sellén27 Comments

As you may know, the 4l60e & the 4l80e are really common transmissions in GM, Chevrolet cars and a lot of other American cars.

But what actually is the difference between the 4L60e vs the 4L80e transmission? Can you swap between them?

In this article, we will discuss everything about this and you will get the specifications for both transmissions and the differences between these.

Let’s start with the specifications!

4L60E vs 4L80E Specifications

Name 4l60E 4l80E
Type 4 Speed Automatic
4 Speed Automatic
Applications GM Cars - GMC, Chevy/Chevrolet, Buick GM Cars - GMC, Chevy/Chevrolet, Buick
Gears 3 + 1 Overdrive 30% 3 + 1 Overdrive 30%
Weight 150 lbs dry~ 236 lbs dry~
Lenght 23.5" 26.4"
Gear Ratios 1: 3.059
2: 1.625
3: 1.00
4: 0.696
R: 2.294
1: 2.482
2: 1.482
3: 1.00
4: 0.750
R: 2.077
Case Material Aluminum Aluminum
Fluid Capacity 11 Quarts 13.5 Quarts
Max Torque 350nm +/- 450nm +/-
Image 4l60e 4l60e transmission
Pan Gasket/Bolt Pattern 16 bolt

4l60e gasket
17 bolt

4l80e gasket
Name Before TH350

Differences between the 4L60E & 4L80E transmission


Even if these transmissions look pretty much the same on the pictures, there are a lot of things that are different between these transmissions. Here are the most significant differences between these transmissions. Remember that these are the main differences and you can find other small differences if you carry out more in-depth research.

1. The size & weight

The biggest difference is probably the size & the weight between the 4L60E and the 4L80e transmission. The 4L80e is much larger and heavier than the 4L60E. The 4L60E has a weight of 150 lbs without fluid and a length of 23.5″, while the 4L80e has a weight of 236 lbs and a length of 26.4″. Just with these numbers, you can probably calculate that there is a big difference in size and weight between these transmissions.

2. Gear ratios

Another big difference between these transmissions that is important to think about if you are going to swap them, is the gear ratios. For example, on the first gear, the 4L60e has a gear ratio of 3.059:1 while the 4L80e has a gear ratio of 2.48:1. This is important to keep in mind if you are swapping between any of these transmissions. You can normally compensate for the new gear ratio with another rear axle differential, so this is not always a big problem, but it’s good to know about.

3. Pan & pan gasket

If you are looking under the transmission for the transmission fluid pan, you will realise that there is a big difference between the transmissions. This is a good way to identify if you have a 4L60e or a 4L80e transmission in your car. The 4L60e has a rectangular pan & gasket of 16 bolts and the 4L80e has a more oval-shaped transmission pan with 17 bolts. You can see the pictures of the gasket in the specification above.

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4. Max torque

Due to the size of the transmissions, there is also a large difference between the durability of these transmissions when it comes to performance. This is mainly because of larger internals inside the transmissions. The 4l60e transmission can handle a max torque of around 350nm, while the 4l80e can handle 450nm~ or even more. These numbers can differ a lot and you will get a lot of different answers about how much these can handle. We have to remember that there is a big difference in the durability between a 30-year-old transmission and a new one. So the condition of the transmission is important to consider when you want to know the max torque.

6. Wiring harness, controller & sensors

There is a big difference when it comes to the electronics of these transmissions. The wiring harness and the transmission control unit are completely different and they are not compatible with each other. There are also differences when it comes to the sensors, mainly that the 4L80e has 2-speed sensors that are different than the sensor on the 4l60e. If you want to swap to one of these transmissions, remember to also purchase the control unit and the harness.

8. Price

Because the 4L60e is a lot more common than the 4L80e, there is also a big difference in the pricing of both used and new transmissions. This also applies to the parts because there are much easier and more available parts & whole transmissions of the 4L60e than the 4L80e. If you want to find parts for these, I  recommend you to check online. If you have a 4L60e, you can probably go to a junkyard and find parts for your transmission, depending on where you live.

However, you can also find both new and used transmissions and parts online; one of the places to check for these is on Amazon. Here are some of the examples of what you can find.

Similarities between these transmissions

If you are looking at the transmission, they actually look pretty much the same, depending on the year of the transmissions. One of the similarities between these transmissions is that both of them are electronically controlled. The bolt pattern for the transfer case is also the same so it will fit in a swap without problems.

One thing to consider is that the 4l60e was named th350 and 700r4 before in earlier models and the 4l80e was named th400.

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4L60E to 4L80E Swap

4l60e to 4l80e swap kit

If you have checked the recent information in this article, you may have figured out already that swapping between these transmissions is not plug & play at all. There are a lot of differences in these transmissions and here are some of the things you have to consider if you are going to swap the 4L60e to a 4L80e transmission. Remember that some points can differ depending on the year and the car model of the transmission and the car you are swapping in.

Swapping a 4l60e transmission to a 4l80e transmission is not an easy job, but it’s totally do-able if you are willing to spend some time and money. Here are the things you have to consider:

Transmission tunnel

Because of the larger size of the 4L80e transmission, you may have to modify the transmission on the car that you are going to swap it to. Sometimes, the car models come with both 4L60e and 4l80e from the manufacturer and in these situations, you have to bear this in mind. However, sometimes you have to use a hammer and a welder to make it fit properly.

Wiring harness

There is a big difference when it comes to the wirings and sensors for the transmissions. You can do it yourself and repin and rewire the OEM wirings, but it’s pretty difficult and time-consuming and it’s not a job for a beginner. A much easier way to do it is to get a pre-made swap kit harness, which is not cheap but I can still recommend it because you will save a lot of time and headache. You can find the transmission wiring harness swap kit here from Amazon: 4L60e to 4L80e Transmission Plug and Play Adapter Harness LS Swapir?t=askamastermec 20&l=am2&o=1&a=B076QLN4XR


The dipstick is different on the 4l80e transmission and you have to consider this when doing your swap. If your car model came from a factory with the 4l80e, get a dipstick from a transmission that has been fitted in one of these cars. Otherwise, there are a lot of custom solutions that can be done or you can get a flexible dipstick like this one for 4l80e:
Lokar XTD-3518FM Transmission Dipstickir?t=askamastermec 20&l=am2&o=1&a=B005P6QRZQ


The 4l80e driveshaft is longer than the 4l60e and this has to be considered when doing your swap. However, the same thing applies here. If your car model came with the 4l80e transmission from the factory, get a driveshaft from one of these models if possible. If not, there are a lot of shops that can make the driveshaft shorter for you. You can also measure and check for a driveshaft on other models to see if you can find one with the same length.

Flex plate/torque converter

You have two alternatives on this one to make it work properly. You can either get a special adapter kit which normally includes a spacer and an input shaft to make it work with your converter. Alternatively, you can use the flex plate and the torque converter from the 4l80e transmission.

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The engine control unit often has to get reflashed and reprogrammed for the 4l80e transmission to work properly. You can search the web or find a local dealer to do this job for you. There are also premade control units for this but it’s often pretty expensive. If you are making any modifications to the engine as well, it’s recommended to let a tuner do the transmission reprogramming at the same time as they are tuning the engine on the dyno.


The 4L80e transmission case is longer than the 4l60e transmission, so the cross member has to be modified. You can either purchase an already premade cross member or you can make one yourself with a welder and some skills. Remember that it’s important to get the transmission perfectly lined up straight. There are a lot of differences between which car you are going to convert and how much you have to rebuild the cross member.

If the car that you are swapping the 4l80e transmission into came with that transmission from the manufacturer, you can get one of these crossmembers and install it on your car for a plug and play situation.


Overall, these transmissions are completely different even if they look almost the same. In summary, the 4l80e is larger and can take more power than the 4l60e. If you are going to swap your transmission, try to get as many parts as possible from the 4l80e transmission that you are purchasing, like the torque converter, flex plate, dipstick etc.

I think I have covered the most important parts when it comes to the difference and the swapping between the 4l60e and the 4l80e transmissions. If I have missed something or if you have any other questions, you are welcome to ask your questions below and I will answer them as soon as possible. I hope you enjoyed the guide!

27 thoughts on “ 4L60E vs 4L80E Differences: Swap & Information ”

    1. Author

      @Rodney Do you mean the 4L89E or the 4L80E? However, I assume that you mean the 4L80E. If you are looking for performance, the 80E is stronger and more reliable.

    2. What do I do to swap a 4l60e to a 4l80e in a 1996 Cadillac Fleetwood brougham

  1. I have wire harness pulled in half ….. there are two yellow black wire locations in new connector and two pink. How do I know what goes to what

    1. Author

      Try to check on google images for “4l60e pinout” and “4l80e pinout” to see if you can figure out the wirings. Is it a purchased harness or you are doing one yourself? However, if it’s purchased, the manufacturer of the harness should have one for you.

  2. I have a 99 suburban LT been searching for days for the wire harness plug in locations do u know where i can find a video or a routing diagram for the transfer case and transmission

    1. Author

      Sorry, I do not have any information about this car or a wiring diagram. However, your best bet is probably to ask in a suburban forum. You can also try to google “Model + transmission + pinout” etc

  3. I bought a 4L60e transmission for my ’98 Chevy silverado z71 4×4 but it isn’t the right kings. I’m ignorant on the subject so could someone please tell me why it didn’t work ?

    1. Author

      What part is does not fit? The wiring connectors? The 4×4 models are special and that might be your issue that the new transmission is from a 4×4?

  4. What if you have a harness that went to a 4l80e but now have a 4L60E? Can you make the OEM harness work for 4L60E? Or is an adapter needed?

  5. I’m swapping a 5.3 truck motor into a hot rod and there is a minor problem with getting the engine low enough because there is a full bellypan attached to the bottom of the frame and nothing can be below that. How far below the crank centerline does the pan of the 4l80e hang? This appears to be the stumbling block to getting the engine low enough, as there are engine oil pans that barely hang lower than the flex plate and still hold 8 quarts. Are there low-profile pans for the 4l80e?

  6. I have a question. If the 4l80E has a longer case (26.4″) than the 4l60E (23.5″) why are you saying that the 4L 80E drive shaft is longer and needs shortened? If the wheel base of the vehicle remains the same and you install a longer transmission in place of a shorter transmission then you would need to install a SHORTER drive shaft to make the installation correct.

  7. Thanks for the information! I was looking to find out if the transfer cases were the same. Speed sensors and all.

  8. I’ve got a 2003 Chevy Silverado 15102 Will Dr. I’m wanting to find a crossmember for the truck. It came out with a 4L 60 E and the transmission was no good so I’m going with a 4L 80 E and trying to find a crossmember to convert it. Any help would be great

  9. I have a 2003 H2 Hummer. I am on the 3rd 4l60e. That transmission was built for vehicles under 6000 lbs. (Which is why my 6500 lb hummer destroys them when pulling.
    What parts exactly do i need to do this conversion. Im ready to do this conversion now. My hauling vehicle is down and i need to do something that will hold up. Instead of throwing good money after bad.

  10. I am purchasing an LY6 to swap into my El Camino. I want to install a 4L60E transmission behind it so I don’t have to tear up my transmission tunnel. The engine computer was designed for a 4L80 transmission. What changes need to be made for this engine controller to work with the 4L60E.
    Thanks for your help

  11. I’m trying to look for a used transmission for my 2004 K2500 Silverado with 6.0L quad cab. . I know it has a 4L60e, but I want to know what year vehicles would have the same type of transmission.

  12. What all do you think I would need for the 2007 Hummer H2 which had the 4l80e in the 2008-09 models?

  13. Is the bellhousing bolt pattern the same between the 4l60e and the 4l80e?
    Garrett W. Roberts

  14. Hi I have a 72 Vega I’m going with a 2003 Chevy 6.0 a tad under 500 hp I keep hearing one or the other is best to use 4L60 or 4L80 ? If will the 4L60e be strong enough with a stock build or will I have to put a lot of money in it to be strong enough ? I hardly drag race . This is all pro street .i have a modified tunnel for the 4L80e if need too so if I went that way then it sounds like just a stock build would be strong enough ? The I wonder about the hearing too ? Your thoughts might really help me a lot !! Thanks bud

  15. How tall is a 4L40e from the base of the stock pan to the top of the bell housing?

  16. Will the working harness fix my issue of no 4 gear
    Swap 4L60 E out and ismnstalled 4L80E

  17. Due to very high demand and a high amount of comments, you might have trouble getting your comment answered by me. If you want to get fast answers from a certified automotive technician you should ask your questions here: Ask A Mechanic

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