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Mercury 5W1Z-3078-AA Front Suspension Arm Assembly

2004-2005 Mercury Grand Marquis 5W1Z3078AA

Customer Questions & Expert Answers (3)
5W1Z-3078-AA Ford Front Suspension Arm Assembly Illustration 1 of 1
5W1Z-3078-AA Ford Front Suspension Arm Assembly Illustration 1 of 1
  • Part Description
    Arm Assy - Front Suspension
  • Position
    Passenger Side
  • Replaced By
    6W1Z-3078-AA
  • Manufacturer
    Ford
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A

  • Related Parts

    Shop for related parts for your vehicle

  • Product Specifications

    BrandGenuine Mercury
    Manufacturer Part Number5W1Z-3078-AA, 5W1Z3078AA
    Part DescriptionArm Assy - Front Suspension
    Item Dimensions4.9 x 18.7 x 21.7 inches
    Item Weight18.60 Pounds
    PositionPassenger Side
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerFord
    SKU5W1Z-3078-AA
    WarrantyThis genuine Ford part is guaranteed by Ford's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65

  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    2004-2005 Mercury Grand Marquis8 Cyl 4.6L4AT 4R70W

  • Customer Questions & Expert Answers

    Q:
    Will these fit my car and if not which part will? Thank you.
    A:
    You can Select Your Vehicle to check if 5W1Z-3078-AA fits your vehicle.
    Posted and answered by Ford Parts Specialist Jack
    Q:
    What are the steps involved in removing the balljoint stud and lowering the Control Arm for the 2004 Ford Crown Victoria? Posted by Rick I.
    A:
    Remove the cotter pin from the balljoint stud. Loosen the castle nut on the stud. Use sharp raps on the steering knuckle near the stud to release pressure and loosen the stud. Remove the balljoint stud nut. Lower the control arm by removing its mounting bolts. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Clayton / Oct 21, 2025
    Q:
    What is the process for removing the upper Control Arm on the 2005 Mercury Grand Marquis? Posted by Donovan B.
    A:
    Remove the cotter pin from the upper balljoint stud and loosen the stud nut slightly. Place a floor jack under the lower control arm and raise it slightly. Tap the steering knuckle near the upper balljoint stud with a hammer to loosen it. Use a balljoint stud separator if needed (note that this may damage the balljoint boot). Remove the nut from the upper balljoint stud and the upper control arm pivot shaft attaching bolts. Remove the upper control arm and pivot shaft as an assembly. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by Ford Parts Specialist Sonny / May 09, 2026

Genuine Ford Part 5W1Z-3078-AA, the Right Choice

To ensure reliability, purchase part # 5W1Z-3078-AA Front Suspension Arm Assembly. It is also called Control Arm. OEM parts are of high quality and known for their longevity. This is because they are built to the Ford standards which are relatively high and undergo rigorous quality control testing. This part fits specific Mercury Grand Marquis models.

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