OEM 2004 Mercury Grand Marquis Axle Shaft

2004 Mercury Grand Marquis Axle Shaft Parts Q&A

• Q: What steps should be taken to safely remove and reinstall the differential pinion shaft and axle shaft in a system equipped with rear air springs on 2004 Mercury Grand Marquis?

  A: Before hoisting or jacking or towing the vehicle users must shut off electrical power to the air suspension system through the air suspension switch within the left-hand side of the luggage compartment to avoid unexpected air spring movement. You should begin your repair by disconnecting the rear brake caliper along with the brake disc then support the caliper using mechanics wire and place the rear brake anti-lock sensor aside after unbolted its sensor. Remove the 10 housing bolts from the differential cover to start and drain out the lubricant from the axle housing. The differential pinion shaft removal needs extra care because rotating the differential case or turning an axle shaft might cause differential pinion gears to come loose thus creating potential damage. You should remove the differential pinion shaft lock bolt followed by the shaft itself then carefully push the axle shaft inboard to remove the washer without damaging the U-ring which resides in the washer groove. Secure the lock bolt with a finger-tight application after inserting the differential pinion shaft toward the outside of the axle. When placing the axle shaft ensure both to protect the wheel bearing oil seal from harm and treat its lip with Premium Long-Life Grease XG-1-C or equivalent product that satisfies the Ford specification ESA-M1C75-B. Next place the axle shaft with U-washer on its button end and extenuate outward motion to insert the U-washer into the side gear. To secure the installation position correctly fit the hole in the differential pinion shaft to the lock bolt hole after which insert the lock bolt. To conclude the differential housing cover installation add the rear brake anti-lock sensor followed by the brake disc.