A Front Drive Shaft driveshaft is responsible for transferring engine electrical power from the transmission to the differential and onto the travel wheels. A driveshaft can be a couple of pieces with a middle support bearing in the centre. There happen to be universal joints at either end of the driveshaft which become flex joints that allow the differential to move upward when the car contacts a bump. A the front driveshaft yoke is employed to connect to the tranny while a rear driveshaft flange can be used to hook up to the differential. On elderly models the trunk U joint bolts directly to the differential without using a rear flange. On front wheel drive automobiles there are two travel shafts which are referred to as CV axles.
Driveshaft themselves have hardly any issues with the exception of becoming bent if they come in contact with an obstruction. However the U joints could cause complications which are a part of the driveshaft such as chirping and clucking when the automobile is moving or placed into gear.
Something you need to know that might not exactly be thought of is when a driveshaft is taken off the automobile will no longer be in park. The automobile will roll as the link between the drive wheels and transmitting is taken away. You will have to raise the car up using a ground jack and jackstays. Wear protective eyewear and gloves before starting.
Mark the driveshaft orientation before beginning. This will help returning the driveshaft to its initial situation on the differential which can help avoid driveline vibrations after the driveshaft is reinstalled.
Utilizing a plastic hammer carefully shock the driveshaft loose by the differential flange simply by striking the trunk yoke (U joint mount). At this time the back half of the shaft will be free so hang onto it. On some vehicles you will see a centre support which must be undone by removing the two center support installation bolts. When removing an older vehicle drive shaft apply electrical tape to wrap around the u joint cups and so they don't fall off and launch the cup needle 
On front wheel travel cars the driveshaft isn't used. The transmission and differential is mixed into one product called a transaxle.
All shafts are reassembled with new universal joints and CV centering kits with grease fittings and are then completely greased with the proper lubricant. All shafts happen to be straightened and pc balanced and examined to closer tolerances than OEM requirements.
The drive shaft may be the part on the lower correct side of the picture. The various other end of it might be connected to the transmission.