Fitment：

• Cadillac Escalade ESV 2015-2018
• GMC Yukon XL 2015-2018

Item Description：

A drive shaft, driveshaft, driving shaft, tailshaft (Australian English), propeller shaft (prop shaft), or Cardan shaft (after Girolamo Cardano) is a component for transmitting mechanical power, torque, and rotation, usually used to connect other components of a drivetrain that cannot be connected directly because of distance or the need to allow for relative movement between them.

As torque carriers, drive shafts are subject to torsion and shear stress, equivalent to the difference between the input torque and the load. They must therefore be strong enough to bear the stress, while avoiding too much additional weight as that would in turn increase their inertia.

To allow for variations in the alignment and distance between the driving and driven components, drive shafts frequently incorporate one or more universal joints, jaw couplings, or rag joints, and sometimes a splined joint or prismatic joint.

Installation Steps：

• Remove the split pin from the hub nut, then crack the hub nut off so that it’s loose, but leave it attached.
• Jack the car up, remove the front wheels and take off the brake calipers. Remove the hub nut completely. 
• Undo the nut onto the lower ball joint and break the hub assembly and the lower arm apart. Pull the hub away from the drive shaft, freeing the outermost end.
• Remove the drive shaft end from the gearbox.
• Fit the new drive shaft. Make sure you tighten the hub nuts up to the manufacturer's specified torque. 

Symptoms of a bad drive shaft：

An automotive drive shaft can typically last about 120,000 kilometres. However, if the vehicle experiencing any of the signs below, drivers should get it checked as soon as possible.

• Clicking or squeaking noise: Driver can either hear a clicking, squeaking, or grinding noises coming from underneath the vehicle when driving.
• Clunking sounds: Driver can hear the noises especially when turning the vehicle, accelerating or even putting it into reverse.
• Vibration: An early and common symptom of a failing drive shaft is an intense vibration coming from underneath the vehicle. Worn out couplings, u-joints, or bearings cause excessive drive shaft vibration.
• Turning problems: Problems with turning the vehicle, both during slow and high-speed drives, is another significant sign of a bad drive shaft.