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
Awesome service...Highly recommend .Manager was...
Dan Arsenault
Awesome service...Highly recommend .Manager was extremely helpful looked at my car free of charge and actually refilled my transmission fluid for Free ....Class act !!!! Definitely will be back in the future , Thanks Dan
Date: January 23, 2021
Website: Google
Great communication during the whole...
John Devries
Great communication during the whole process. Honest and no over charges.
Date: January 23, 2021
Website: Google
Excellent service and down to...
Joseph Bozzo
Excellent service and down to hearth guys, very honest. Highly recommend them to anyone.
Date: January 22, 2021
Website: Google
Contacted mr transmission in regards...
Shawn Farraway
Contacted mr transmission in regards to my suv. they got me in right away and were able to help me get back on the road. they were easy to talk to and easy to deal with. I highly recommend them for any and all services your vehicle needs.
Date: January 21, 2021
Website: Google
200% satisfaction. Very reasonable price.Mr....
Keunoh Kim
200% satisfaction. Very reasonable price.Mr. Ken who has over 30 years experienced as a mechanic is not only knowlegeble ,but frendly and thoughful. He figured out my transmission problem so easly. Receptionist is kind as well.If you are literally looking for honest and integrit, there's no doubt about it.
Date: January 21, 2021
Website: Google
Brought my truck to this...
Patrick Messier
Brought my truck to this location after discussing the symptoms of my faulty clutch.Dealt with two other garages previously who attempted to overcharge for work not needed.The manager here fixed the problem at a fraction that the other garages quoted me for.Truck drives perfect and he even threw in a free transmission oil change for some unforeseen delay.Honest and competitive. Thanks Mr Transmission.
Date: January 21, 2021
Website: Google
Really fast service. Not only...
Terry V
Really fast service. Not only was my problem fixed, you can feel how much smoother the shifter moves. Highly recommend.
Date: January 20, 2021
Website: Google
The guys at Mr transmission...
William Jensen
The guys at Mr transmission on the queensway go above and beyond expectations! They always called me to update me on the progress of diagnosing my vehicle. They fixed my leaking cooler lines, now it drives like new! Thanks guys
Date: January 18, 2021
Website: Google
Always above and beyond!Mostly my...
Samantha Prowse
Always above and beyond!Mostly my car has gone in for basic maintenance, but recently I had a hitch installed on my car. In the process of having this done it was noticed I had a sensor malfunctioning. NO PRESSURE what so ever to have this fixed at the same time. I was told the risks and given a choice. I chose to fix it as my car was in anyway, but I loved having the choice with no judgement or pressure. Pricing was fair, and definitely less than I was expecting. I didn't feel my lack of car knowledge as a female was an issue here at all. I was made to feel informed and involved. I recommend this shop to all of my friends ☺️
Date: January 17, 2021
Website: Google
The guys were greatThe owner...
Frank Losiggio
The guys were greatThe owner operator was very knowledgeable about my suvAnd was polite, and professionalI would strongly recommend these guys to other people who need transmission work done
Date: January 17, 2021
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
Why You—Yes You—Need To Check Your T...
Checking one’s transmission fluid is an integral part of vehicle ownership. If you
Read More
January 21, 2021
What Is A Transmission Solenoid?
The “transmission solenoid”. Or maybe you heard it as “solenoid pack”.
Read More
January 14, 2021
5 Ways Transmission Service Can Help
Regular service is crucial for the long-term health of your vehicle’s transmission.
Read More
January 7, 2021
FAQs About The Torque Converter
Torque converters are key components of transmissions. How often do they require
Read More
November 30, 2020
5 Tips For Transmission Maintenance
Good transmission maintenance practices mean the difference between years of
Read More
November 25, 2020
Are CVT Transmission’s Difficult T...
You’ve heard of automatic transmissions. You’ve heard of manual transmissions.
Read More
November 18, 2020
How To fix A Slipping Transmission
What is the fix for a slipping transmission? It’s simple. Just pop the hood of your
Read More
November 12, 2020
What Are The Indications Of A Bad Torque...
The torque converter is an integral part of the transmission. However, torque
Read More
October 19, 2020
“What Transmission Do I Have?̶...
On this site you will see terms like “transmission overhaul”, “solenoid
Read More
October 5, 2020
How Do You Rebuild A Transmission?
The decision to rebuild a transmission is not to be taken lightly. While a
Read More
September 30, 2020