What to know about lubricating the driveshaft:
Along the drivetrain, whenever torque needs to travel from one place to another, a driveshaft is used. Some cars have two driveshafts under them, usually for four-wheel-drive applications. U-Joints are couplings that hold sections of driveshaft together and can withstand large amounts of torque. The U-joint and the slip both need lubrication to perform smoothly. This means lubricant needs to be applied to all point where the driveshaft meets another section of shaft or any other part of the vehicle.
Facts to Note:
While lubricating will help with scraping noise and minor vibration, it will not repair actually damaged parts.
Check the parts of the driveshaft to ensure they do not need full replacement.
Even small spots of excess wear are bad on parts that withstand so much torque, no problem is too small to be addressed on the driveshaft.
How to Fix:
The vehicle is raised and placed on jack stands
The slip joints and U-joints on all drive shafts are found
The Zerk grease fittings on the slip joint and U-joints are found
New grease is applied into the grease fittings with a grease gun
The vehicle is lowered off of the jack stands
Check the manual of your vehicle to see if the manufacturer has specific instructions on servicing and lubricating the driveshaft. If the manufacturer suggests it is time for a service or if the vehicle has signs of an abnormal driveshaft, then it should be done without delay. These parts are under a lot of force and will usually fail when the car is in motion. While under the vehicle, check all of the connections along the drivetrain and keep an eye out for any component that seems excessively worn. Take a rag and wipe any mud or dust off to check for damage.
Common symptoms indicating you need to lubricate the driveshaft:
Clicking or grating sounds while the vehicle is in gear
Vibration in the vehicle while it is running
Importance of this service:
This service is very essential. Poor lubrication is one of the top facts why driveshafts fail. When they do fail, driveshafts will fail while in motion and can take out more costly parts around them. These preventative maintenance steps are extremely necessary in order to avoid more costs down the road.