A driveshaft is in charge of transferring engine power from the transmitting to the differential and onto the drive wheels. A driveshaft can be a couple of pieces with a center support bearing in the centre. There will be universal joints at either end of the driveshaft which act as flex joints that permit the differential to go upward when the car contacts a bump. A entrance driveshaft yoke is utilized to hook up to the transmission while a backside driveshaft flange can be used to hook up to the differential. On old models the trunk U joint bolts right to the differential without by using a rear flange. On entrance wheel drive cars there are two drive shafts which are known as CV axles.
Driveshaft themselves have very little problems with the exception to become bent if they come in contact with an obstruction. On the other hand the U joints could cause problems which are a part of the driveshaft such as chirping and clucking when the car is moving or put into gear.
Something you need to know that might not exactly be thought of is whenever a driveshaft is taken off the car will no longer be in park. The automobile will roll because the link between the drive wheels and tranny is taken out. You will need to raise the car or truck up using a flooring jack and jackstays. Dress in protective eyewear and gloves before you begin.
Tag the driveshaft orientation before you begin. This will help go back the driveshaft to its primary location on the differential that may help avoid driveline vibrations after the driveshaft is reinstalled.
Using a plastic hammer lightly shock the driveshaft loose coming from the differential flange simply by striking the rear yoke (U joint install). At this time the back 50 % of the shaft will always be free so keep hold of it. On some autos there will be a middle support which should be undone by the removal of the two centre support mounting bolts. When removing an older vehicle drive shaft apply electric tape to wrap around the u joint cups thus they don’t really fall off and relieve the cup needle bearings.
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 fresh universal joints and CV centering kits with grease Front Drive Shaft fittings and so are then completely greased with the correct lubricant. All shafts are straightened and computer balanced and examined to closer tolerances than OEM requirements.
The drive shaft may 
be the part on the lower right side of the picture. The other end of it might be connected to the transmission.