Transmission Parts

By Mister Transmission

Transmission parts knowledge for people researching how transmissions work.

A transmission is an impressive puzzle to most drivers, made up of many intricate connections among a multitude of transmission parts. The complexity of these parts and how they fit together is intimidating, especially if you’re facing transmission repairs and you don’t understand what’s happening or why.

While we need to trust our transmission mechanics to take care of the specifics, knowing a little bit about the transmission parts that might be malfunctioning can help to set your mind at ease during the transmission repair process.

The first step to a basic understanding of transmission parts is to understand the purpose of the transmission as a whole. Your automatic transmission is responsible for transferring the power of your engine to the drive shaft and wheels so that your car can move within its optimal range of revolutions per minute (RPM). The transmission maintains this optimal range by shifting transmission gears as you drive faster or slower.

 
The main transmission parts that need to work together are:
  •     Planetary Gear Sets
  •     Hydraulic System
  •     Torque Converter
  •     Computer
Planetary Gear Sets

Manual transmissions use a clutch to connect the engine and transmission. They require the driver to shift the transmission gears, which means actually moving the gears in a somewhat linear, sliding transfer to engage with the coordinating gears needed to maintain the proper RPM ratio. Automatic transmissions keep the transmission gears in one place, in a more circular structure. This is not unlike a small solar system, hence the name Planetary Gear Sets.

Using the combination of an outer ring gear, a central “sun” gear, and two or more smaller “planet” gears, which are all constantly meshed together, the transmission takes over the gear shifting from the driver. Much like the solar system, the sun gear is in the centre and remains stationary and the smaller planet gears engage with it and the ring gear to keep the car moving smoothly.

The ring gear is connected to the input shaft, which brings power from the engine. The planet gears exist within a casing or carrier that is connected to the output shaft which carries power to the drive train and wheels. The planet gears are also connected to a clutch pack. The sun gear is connected to a drum, which is connected to the other half of the clutch pack.

Transmission clutch packs are a series of disks, half with splines on the outside edge, and half with splines on the inside edge. These alternating disks are made to fit together to lock and turn together. They do this using hydraulic functionality.

Hydraulic System

All of the transmission parts are constantly submersed in transmission fluid. This fluid is manipulated to create pressure, which pushes the transmission clutch pack together at the right time. A complex system of tubes moves the fluid around the transmission and torque converter to create this pressure. The transmission hydraulic system has three main purposes: to help control transmission gear shifting, to lubricate the transmission parts to prevent friction damage, and to keep the transmission cool. The fluid pressure within the transmission must be maintained at all times to prevent damage.

The tubes that transfer the transmission fluid have two major external seals at the front and back. The seal at the front protects the connection with the torque converter and the rear seal contains the fluid where the transmission meets the output shaft. Seals are made of neoprene. Within the transmission exists another type of seal, called a gasket, which connects and protects two stationary transmission parts. Gaskets may be made of any of a variety of materials, such as rubber or silicone. Seals and gaskets can harden over time, which might cause leaks and a drop in transmission fluid pressure, both of which can lead to damage to the transmission.

Torque Converter

When driving a manual transmission, the driver must engage the clutch or shift into neutral when the vehicle comes to a stop, such as at a red light, or the engine will stall. The torque converter in an automatic transmission allows the engine to continue running when the vehicle is stopped yet still in gear. Torque is defined as a force that causes rotation. The torque converter uses the pressure of the transmission fluid to control the rotation of its parts. When you are stopped at that red light, one half of the torque converter is turning while the other is stationary. When you accelerate, the fluid pressure forces the other half to spin in conjunction with the first half so that vehicle moves forward.

Computer

In most cars today, a computer controls the transmission’s function allowing all vehicle systems to work together for optimum fuel economy and power. As many as 30 sensors read all of the various factors such as vehicle speed, engine temperature, engine speed, etc, that control transmission gear shifting to ensure the optimal shift points are used.

The many transmission parts in your vehicle may remain a puzzle, but understanding some of the basics can help you to have a more informed conversation with your transmission mechanics before leaving it in their capable hands.

As Gene Lewis at the Moncton Mister Transmission says,

“We’re the specialists, transmissions are all we do.”

 

If you are experiencing a problem with your vehicle’s transmission, please contact your local Mister Transmission and book an appointment for our FREE 21-Point Multi-Check Inspection.

For a more in-depth explanation, please visit our Transmission School

Vous aimeriez apprendre advantage?
Visitez un de nos emplacements!

image-reviews image-reviews
Customer Reviews
Super proffesional, problem solved and...
Angus Murray
Super proffesional, problem solved and the bill was as quoted. What else is there!
Date: May 25, 2022
Website: Google
Amazing. Had another place fix...
Rob Jackson
Amazing. Had another place fix my manual transmission and it fell apart in under two weeks. So I went to the pros and that they are. Pulled it apart and had me back together in no time. The only place to get your transmission issues fixed properly and fast. Thanks guys
Date: May 25, 2022
Website: Google
They were great on the...
Sandy Shropshire
They were great on the phone and in person when we needed to get our vehicle towed in. Thanks Chris and Christine
Date: May 25, 2022
Website: Google
Matt and his team are...
LovelaceBreh
Matt and his team are a breathe of fresh air to work with after years of headaches with untrustworthy mechanics & shops. I drive a lifted truck and had my transmission replaced here a few months ago and I've had nothing but great, honest service since my very first phone call with Matt. I usually do all my own maintenance but I felt so confident, I've taken my truck here 4/5 times since (unrelated issues) even sometimes for little things that I could fix myself, just because I trust them to do a thorough job and give me all the details step by step. ALSO, As someone whos had issues with mechanics "Joy Riding" their vehicles before I was ecstatic to see that Matt & his team take extreme care when test driving vehicles (hidden dashcam, so its not because they noticed they were being watched)This is the first ever review I've written for anything, ever. So rest assured the service at Mr. Transmission on Bath Road had to have been pretty awesome for me to leave this.Thanks guys hopefully I don't ever see you again LOL
Date: May 24, 2022
Website: Google
Wonderful staff very friendly, there...
Tristan W
Wonderful staff very friendly, there there for you and not like many shops that’s there staffs attitude when you walk in the door, very helpful and honest! Great place
Date: May 24, 2022
Website: Google
Matt and his team are...
LovelaceBreh
Matt and his team are a breathe of fresh air to work with after years of headaches with untrustworthy mechanics & shops. I drive a lifted truck and had my transmission replaced here a few months ago and I've had nothing but great, honest service since my very first phone call with Matt. I usually do all my own maintenance but I felt so confident, I've taken my truck here 4/5 times since (unrelated issues) even sometimes for little things that I could fix myself, just because I trust them to do a thorough job and give me all the details step by step. ALSO, As someone whos had issues with mechanics "Joy Riding" their vehicles before I was ecstatic to see that Matt & his team take extreme care when test driving vehicles (hidden dashcam, so its not because they noticed they were being watched)This is the first ever review I've written for anything, ever. So rest assured the service at Mr. Transmission on Bath Road had to have been pretty awesome for me to leave this.Thanks guys hopefully I don't ever see you again LOL
Date: May 24, 2022
Website: Google
great work done there
Ljm M
great work done there
Date: May 23, 2022
Website: Google
Dealt with Ken on two...
David Branicky
Dealt with Ken on two seperate occasions and both times he was honest and very helpful.Once I brought my 2003 Dodge Caravan in where I could not drive forward after a hard stop but after a few seconds it would start driving again. So I thought my transmission was starting to give up and would eventually need to be replaced but it turned out to be as simple as my transmission fluid level was low. So once he topped it up I never had that issue again and drove the van another 80k before selling it.
Date: May 22, 2022
Website: Google
I called this shop about...
Michael Cormier
I called this shop about 3 years ago when my 2010 Pontiac G5 needed a new clutch , I spoke with Jason and his price quote was $500.less than any of the other transmission repair shops I had called for quotes . The turnaround was quick and the repair was done for the quoted price and within the time they said it would take , I was extremely pleased ! When my check engine light came on last night and the cars engine power was reduced I called the shop this morning (Friday of a long weekend) and spoke with Jen , they were able to do a diagnostic test and reset , I got my car back within 3 hours when I asked how much they said no charge ! these guys and gals are the best and very trustworthy ! 10 out of 10 stars , Mike in Toronto
Date: May 21, 2022
Website: Google
Want to repair transmission of...
Prajnesh Yajnik
Want to repair transmission of your car, visit this place. A known place for transmission repairs or replaces.
Date: May 21, 2022
Website: Google
Featured Services
Transmission Repair

The evolution of transmissions has made these machines and systems increasingly complex. When transmission repairs are required, determining the cause and cure for what ails can be tricky.

Read More
Transmission Technology

At Mister Transmission we have access to leading-edge diagnostic equipment, enabling us to offer you the fastest and most accurate findings about what’s going on inside your vehicle’s transmission.

Read More
Transmission Maintenance & Service

Just as you have other parts of your car serviced, your transmission needs maintenance to ensure a long life and avoid transmission problems.

Read More
Recent Blogs
Mister Transmission: Your Transmission T...
Everything seems to be computerized these days and automobiles are no different,
Read More
May 18, 2022
3 Common Transmission Repairs
Transmissions are complex pieces of machinery and there’s a lot that can go wrong
Read More
May 11, 2022
When Do You Need Transmission Service?
Transmissions need to be serviced, maintained, and repaired from time to time, but
Read More
May 4, 2022
How Is Transmission Repair Different Fro...
Mister Transmission specializes in servicing transmissions because they’re so
Read More
April 27, 2022
What Are Vehicle Diagnostics?
Discover what vehicle diagnostics are all about, how this practice helps transmission
Read More
April 7, 2022
What Are Some Common Automatic Transmiss...
If you drive a vehicle with an automatic transmission, what are some common automatic
Read More
March 31, 2022
CVTs Vs. Automatic Transmissions
Looking at buying or leasing a vehicle and want to know if you should opt for one
Read More
March 28, 2022
What Is Transmission Oil And Do You Need...
You’ve probably heard of a transmission fluid change, and you’ve probably heard
Read More
March 24, 2022
What Causes Transmission Slipping?
Has your transmission been slipping? It’s important to get it looked at right away.
Read More
February 22, 2022
When Is A Transmission Rebuild Necessary...
If you can avoid ever having to rebuild your transmission, you’ll be better off for
Read More
February 15, 2022