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Download the Full Transmission code List Here.

Use the transmission lookup tool

If you still cannot find your transmission, try it on the ATRA transmission lookup tool. You’ll need to input basic information like the year, make, and model, and the tool will provide you with the transmission code.

What are the popular transmission types?

Today’s transmissions are varied. In the past, all automatic transmissions had three speeds, meaning that they would start in first gear and shift up into second, then into third or direct drive. In third or Drive, the engine was turning at the same speed as the driveshaft. Those transmissions would not provide the best fuel efficiency, nor would they provide the shift quality we have come to know and expect. Today, 6-speed, 8-speed, even 10-speed automatic transmissions are the norm.

In past years, automatic transmissions were relatively easy to service and required service usually once a year/every other year. The fluids that were used were very simple to keep up with. Dexron for GM and Chrysler, Type F fluids for Fords. Type A fluid was available but typically relegated to tractor use and very early automatic transmissions. But now?

Since the early 1970s, vehicle manufacturers have been looking for a way to increase fuel efficiency. Engines were modified/number of cylinders reduced while removing weight from the vehicles. The “lead sleds” were fast becoming a thing of the past. As this trend continued into the 1980s, the next logical way to reduce fuel consumption was to reduce the amount of power it took to operate all the accessories. This also included the transmissions. If operating pressures were reduced inside the transmission, the engine didn’t have to work as hard to turn the pump inside the transmission. Unfortunately, lower pressures =a higher chance of clutch failures. More changes, along with the advent of computer-controlled engines AND transmissions was the only thing that would work.

In fact, most people think that there are only two types of transmission:manual and automatic. While these are the two main types , there is more to each type than just that distinction.

1. Automatic Transmission

A vehicle with an automatic transmission is one of the most complicated factors in how it actually works. But from a usability standpoint, it is the simplest , so it is the most common type of transmission on the road today.

The learning curve for an automatic transmission is one of the lowest since it’s effortless to learn.

If all you have to do is to press the brake pedal and move your gear shifter into reverse or drive, you have the luxury of an automatic transmission.

It will automatically shift gears for you as you drive, making for a much simpler driving experience .

Of course, there is a mechanical complexity to it behind the scenes. But you don’t have to worry about that unless something goes wrong.

When you open your vehicle’s hood, you may see a code stamped on the transmission or even a tag hanging on it. This will help you identify whether you indeed do have an automatic transmission or not.

The transmission’s pan shape is probably the quickest and easiest way to tell which type it is. Most of the automatic transmissions are either square or shaped oddly.

If you still don’t know whether you have an automatic transmission, you can measure it and find a chart with a quick online search to match the dimensions to yours and identify it.

2. Manual Transmission

The manual transmission is one of the oldest and most trustworthy types of transmissions that they still make today.

You may have heard it referred to as a standard or a stick shift as well.

As the driver, you have to manually operate the clutch with your foot and shift into different gears accordingly.

The learning curve for a manual transmission vehicle is much greater than the other counterparts. But there are some advantages to having one.

Since the transmission is much less complex, repairs will not be as costly or difficult to fix. Drivers still enjoy a manual transmission because they have more control over how the vehicle runs. Besides, you will generally get better fuel economy than with automatic transmissions.

Identifying manual transmissions can be difficult. The 3-speed, 4-speed, and 5-and-6-speed transmissions all have different characteristics. You can find them in diagrams online if you are unsure about what they look like.

Things to consider when looking at the manual transmission include the position of the selector’s arms and whether the mounting studs protrude from the side case or if the selector’s arms are secured with a bolt.

Knowing this information, combined with a diagram or chart of common characteristics of manual transmissions, you should be able to positively identify the type of manual transmission you have.

3. Dual-Clutch and Semi-Automatic Transmission

These types of transmissions aren’t prevalent for a variety of reasons.

It is essentially a hybrid between a manual and automatic transmission. A semi-automatic transmission has a similar design as an automatic transmission, while dual-clutch transmissions have separate clutches for even and odd gears.

This may not seem very easy, but once you get the hang of it, you will see how fast you can shift gears.

Since they can rapidly shift gears, you can find these types of transmissions in sports cars built for speed.

As a result, they are very costly due to the complex nature when it comes to repairs.

4. Continuously Variable Transmission

You won’t notice much of the difference between a continuously variable transmission (CVT) and an automatic transmission from a driving standpoint.

From a mechanical standpoint, the CVT uses a belt and pulley system , operated by the vehicle’s computer, instead of gears to create the perfect ratio for the driving conditions.

This is beneficial because it gives the vehicle a much better fuel economy than any other transmission available.

They won’t break down as much or be as costly as an automatic transmission, but they also aren’t as efficient as a manual transmission.