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Automotive Technology

This guide will help with understanding the basics of Automotive Technology, maintenance, and repair.

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Function of transmission

This section will discuss the basic components and types of transmissions used in motor vehicles and what a transaxel is. 


Transmission: Transfers engine power to the driveshaft and rear wheels or axles to the front wheels

Transaxel: a mechanical device which groups the roles of an transmission, the axle, and the differential into one integrated assembly.

Types of Transmissions


Automatic Transmission (AT)

Uses a torque converter, planetary gearset and clutches to shift through a vehicle's forward gears automatically.

Manual Transmission (MT)

The driver selects all gears manually using both a movable gear selector and a driver-operated clutch. 


Automated Manual Transmission (AM)

Employs a mechanical clutch; however, the action of the clutch is not controlled by the driver using the clutch pedal but is automated using electronic, pneumatic or hydraulic controls.

Continuously Variable Transmission (CVT)

Has a continuously variable drive ratio and uses belts, pulleys and sensors rather than gears to maintain a steady acceleration curve with no pauses for gear changes. 

Basic Components of A Transmission

The basic components of a transmission are:

Planetary gear sets

Hydraulic System

Torque Converter

Automatic transmissions require a valve body to control the Automatic Transmission Fluid or ATF, Sensors, bands and clutches.


A Transaxel contains the following components:

Shafts (input, idler, counter, etc)

Clutches and gears


Components can vary between different transaxels

Additional Sources

How Automatic Transmissions Work 

How Manual Transmissions Work 
Car Bibles 
All In One Auto Service 
Pro Car Manuals 
Automatic Transmission Repair Manuals & Rebuild Parts 
Gearhead 101: Understanding Manual Transmission 

Information and signs of a bad transaxel