2022 Hyundai Tucson interior

Car Transmission: Everything you need to know

Contents

Introduction

Without a doubt, the transmission is one of the most important components of any car. It allows the engine to transfer power to the wheels, enabling the vehicle to move forward or backward.

If the transmission doesn’t work correctly, your car will fail to move, or it may produce strange noises or vibrations.

Therefore, it’s crucial to understand how transmissions work and how to keep them in good condition. In this guide, we’ll explore different aspects of car transmissions, from the most basic to the most complex topics.

Automatic Transmission

What are the Types of Transmissions on a car?

Before we dive into the nitty-gritty details of transmissions, let’s first discuss the different types of transmissions that are available in cars:

Manual Transmission

Manual transmission, also known as a stick shift, is a type of transmission that requires the driver to shift gears manually using a clutch pedal and a gear shifter. This type of transmission is popular among car enthusiasts as it provides a more engaging driving experience and better control over the vehicle. Additionally, manual transmissions are generally more fuel-efficient than automatics.

Automatic Transmission

Automatic transmission, as the name suggests, is a type of transmission that doesn’t require manual shifting. Instead, the transmission automatically shifts gears based on the vehicle’s speed and load. This type of transmission is more comfortable to drive and is usually preferred by people who don’t want to hassle with shifting gears manually.

Manual Transmission

Components of Transmissions

Regardless of the type of transmission, all transmissions have similar components that work together to enable the transfer of power from the engine to the wheels. Let’s take a closer look at these components:

Gearbox

The gearbox, also known as the transmission housing, is the outer shell of the transmission that contains all the internal parts. The gearbox is usually made of aluminum or cast iron and is responsible for protecting the transmission’s internal components from external damage.

Clutch

In a manual transmission, the clutch is a critical component that enables the driver to shift gears manually. The clutch separates the engine from the transmission, allowing the driver to shift gears or come to a stop without stalling the engine. The clutch consists of a pressure plate, a clutch disc, and a release bearing.

Torque Converter

In an automatic transmission, the torque converter is a component that transmits power from the engine to the transmission. The torque converter uses hydraulic fluid to transfer power between two turbine fans, which eliminates the need for a clutch. Additionally, the torque converter enables the vehicle to come to a stop without stalling the engine.

Transmission Control Module

The transmission control module, or TCM, is a computer that controls the transmission’s operation. The TCM receives input from various sensors and uses that information to determine when to shift gears, how much hydraulic pressure to apply, and other critical functions.

Transmission Cooler

The transmission cooler is a component that helps keep the transmission fluid cool. The transmission fluid can heat up quickly during operation, which can cause the transmission to fail. The transmission cooler helps to dissipate the heat from the fluid, ensuring that the transmission runs smoothly.

Transmission Mount

The transmission mount is a component that attaches the transmission to the vehicle’s frame. The mount helps to absorb vibrations and prevents the transmission from moving around while the vehicle is in motion.

Transmission Pan

The transmission pan is a metal pan that covers the bottom of the transmission housing. The pan serves as a reservoir for the transmission fluid and can be removed to access the internal components for maintenance or repair.

Transmission Solenoid

The transmission solenoid is an electrical component that controls the fluid flow in the transmission. Solenoids use an electric current to open or close valves, allowing fluid to flow in different directions and control the gears’ shifting.

Transmission Valve Body

The transmission valve body is a component that regulates the hydraulic pressure in the transmission. The valve body contains various valves and channels that control the fluid flow and the gear shifting. The valve body is essential for smooth gear changes and proper transmission function.

Transmission Features

There are many subcategories of transmission systems that you should be aware of. Let’s take a closer look at some of these subcategories:

Overdrive

Overdrive is a feature that allows the transmission to shift into higher gears at lower speeds, which can improve fuel efficiency and reduce engine wear.

Differential

The differential is a component that allows the wheels to rotate at different speeds. This feature enables the vehicle to turn easily and helps to distribute power evenly to the wheels.

Drive Shaft

The driveshaft is a component that transfers power from the transmission to the differential. Driveshafts are usually made of metal and can be prone to wear and damage.

Axles

The axles are components that connect the wheels to the transmission. Axles come in different types, including half-shafts, full axles, and stub axles.

CV Joints

CV joints, or constant velocity joints, are components that enable the axles to rotate while the wheels are turning. CV joints are essential for smooth and quiet operation and can be prone to wear and damage.

Transfer Case

The transfer case is a component that distributes power to the wheels in four-wheel drive or all-wheel drive vehicles. The transfer case can be prone to wear and damage, and regular maintenance is essential to keep it running smoothly.

Transmission Rebuild

If your transmission is not functioning correctly, you might need a transmission rebuild. A transmission rebuild involves restoring the internal components of the transmission to their original condition. A complete rebuild can be expensive but is often necessary for older transmissions.

Transmission Maintenance

Regular maintenance is essential for the proper functioning of the transmission. Some of the essential maintenance tasks include:

– Checking the fluid level and quality regularly
– Replacing the transmission filter periodically
– Flushing and replacing the transmission fluid as per manufacturer recommendations
– Inspecting the transmission cooler and lines for damage or leaks
– Inspecting the transmission mount and torque converter for wear

Transmission Repair

If your transmission is damaged or not functioning correctly, you might need to repair it. Transmission repair involves fixing or replacing the damaged components of the transmission. Some of the common transmission repairs include:

– Replacing the transmission solenoid or valve body
– Repairing or replacing the clutch or torque converter
– Fixing or replacing damaged gears or bearings
– Repairing or replacing damaged seals or gaskets

Transmission Replacement

If your transmission is beyond repair, you might need to replace it. Transmission replacement involves replacing the entire transmission with a new or rebuilt one. Transmission replacement can be expensive but is often necessary for older or severely damaged transmissions.

Shift Kit

A shift kit is an aftermarket modification that can improve the transmission’s shifting performance. A shift kit can provide faster and firmer shifts and reduce transmission wear and tear.

Shift Solenoid

Shift solenoids are electrical components that control the fluid flow in the transmission during gear shifts. A malfunctioning shift solenoid can cause rough shifting, transmission slipping, or other problems.

Transmission Filter

The transmission filter is a critical component that prevents debris and contaminants from entering the transmission. Regularly replacing the filter can prolong the transmission’s lifespan and improve its performance.

Transmission Flush

A transmission flush involves flushing out the old transmission fluid and replacing it with fresh fluid. A transmission flush can remove debris and contaminants from the transmission and improve its performance.

Transmission Slipping

Transmission slipping is a common problem that can indicate a malfunctioning transmission. Symptoms of transmission slipping include the gear slipping, vehicle jerking or shaking, unusual noises or vibrations, and difficulty shifting.

Transmission Noise

Transmission noise can be caused by various factors, including worn gears or bearings, damaged seals or gaskets, or low fluid level or quality. Unusual transmission noise should be inspected by a professional mechanic.

Transmission Slipping Under Load

Transmission slipping under load is a common problem that can occur when the transmission is under stress. Symptoms of transmission slipping under load include the gear slipping, excessive engine revving, and difficulty accelerating.

Transmission Won’t Shift

If your transmission won’t shift, you might have a serious problem with the transmission. Some of the possible causes of transmission won’t shift include a faulty solenoid or valve body, damaged wiring or electrical components, or damaged internal components.

Conclusion

We hope this guide has been helpful in providing you with a comprehensive understanding of car transmissions. From the different types of transmissions to the various components, subcategories, and maintenance tips, we’ve covered everything you need to know.

Remember to prioritize regular maintenance and seek professional help when necessary. Visit all of our top articles of the month for more helpful guides and tips!

This Article was manual reviewed by an Editor

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