1. Clutch or torque converter-   clutch with Manual transmission or torque converter with automatic-permits smooth transfer of power from the engine to the transmission. 
2. Transaxle is the combined transmission and driving axles in a compact unit, saving weight and space inside the passenger compartment. 
3. CV (constant velocity) joints deliver power to the wheels, twisting and flexing like a wrist joint as the steering wheels turn and the suspension moves over bumps. They are packed with grease and covered with rubber boots. 

4. Transmission whether front drive or rear, this Is the gear shifting mechanism that matches engine speed to road speed and load. 
5. Universal joints provide flexibility on a rear drive vehicle between the transmission and the rear axle, allowing the axle to move with the irregularities in the road. 
6. Drive shaft is the tubular component connecting the transmission to the rear axle. 
7. Differential is the round housing at the center of the rear axle. It directs power to the driving wheels and, through its gearing mechanism, permits wheels to turn at different speeds in turns. 

Have confidence in Your transmission Specialist 

While automatic transmissions of the 80's are more complicated than ever, have more parts than ever, and operate at higher temperatures than ever, the specialists who repair them are also better than ever. Hands-on experience is not enough to keep them abreast of today's technology. They supplement their high skill levels through subscribing to technical services, through study of manufacturers' manuals and updates, and through reading trade publications.   

There are thousands of such specialists. Perhaps one of them gave you this brief insight into how to keep your automatic transmission alive and well.