Q: How to Service and Repair the Drive Shaft on Mercury Grand Marquis?
A: In order to service the drive/propeller shaft, lift the vehicle and index-mark the rear axle pinion flange and driveshaft yoke. Take the bolts out, without breaking them. Reduce the driveshaft, index mark the slip-yoke and plug the extension housing. Install fresh bolts making sure they get rightly aligned and lubricated. Undo the process of removal to complete.
Q: How to Service the Rear Two-Piece Drive Shaft on a Four-Wheel Drive on Mercury Mountaineer?
A: To service a four-wheel drive vehicle's rear driveshaft, ensure it's in neutral on a hoist. Remove the center bearing bracket nuts, tighten to 55 Nm, and index-mark the CV joint. Replace CV joint bolts (30 Nm) and driveshaft flange bolts (112 Nm). Avoid hammering; use a tool to pry. Reverse for installation.