Four-Wheel Drive Systems - Excursion & F250-F550 Super Duty

• Specifications
  • General Specifications
  • Torque Specifications Chart
• Description And Operation
  • Four-Wheel Drive Systems
• Diagnosis And Testing
  • Four-Wheel Drive Systems - Mechanical Shift
    • Principles of Operation
      • Mechanical Operation
      • Neutral
      • 2-Wheel Drive
      • 4-Wheel Drive - 4X4
      • 4-Wheel Drive - 4X4 LOW
      • 4X4 ESOF Locking Hub
      • Hub Lock Operation
      • Disengage Time
      • Manual Override
      • Matching Pairs Not Required
      • Hub Lock Removal
      • Hub Contamination
      • Torsional Failure
      • Ratcheting
    • Inspection and Verification
    • Symptom Chart - Mechanical Shift
    • Functional Test - Mechanical Shift
      • Pinpoint Test A: Mechanical Shift Functional Test
      • Pinpoint Test B: 4X4 Will Not Engage
  • Four-Wheel Drive Systems - Electronic Shift
    • Notes
    • Special Tool(s)
    • General Equipment
    • Material
    • Principles of Operation
      • Transfer Case - Electronic Shift
      • Electronic Shift Vacuum Schematic
      • Hublock Operation
      • Disengage Time
      • Manual Override
      • Hublock Replacement
    • Inspection and Verification - Electronic Shift
    • GEM Diagnostic Trouble Code (DTC) Index
    • Symptom Chart - Electronic Shift
    • Functional Test - Electronic Shift
      • Pinpoint Test C: Electronic Shift Functional Test
    • Pinpoint Tests - Electronic Shift
      • Pinpoint Test D: No Communication With The 4WD Control Module
      • Pinpoint Test E: The Vehicle Does Not Shift Between 2WD And 4X4 Correctly
      • Pinpoint Test F: The Vehicle Does Not Shift Between 4X4 And 4X4 Low Modes Correctly
      • Pinpoint Test G: The Front Axle Does Not Engage Or Disengage Correctly
      • Pinpoint Test H: The 4X4 Indicator Is Always On - Four Wheel Drive System Operates Correctly
      • Pinpoint Test I: The 4X4 Low Indicator Is Always On
• General Procedures
  • Gearshift Linkage Adjustment
• Removal And Installation
  • Mode Select Switch (MSS)
    • Removal and Installation
  • Four-Wheel Drive (4WD) Control Module
    • Removal and Installation
  • Hublock
    • Material
    • Removal and Installation
  • Pulse Vacuum Hublock (PVH) Solenoid
    • Removal and Installation
  • Hublock Vacuum Reservoir
    • Removal and Installation
  • Gearmotor Encoder Assembly
    • Material
    • Removal and Installation
  • Mode Indication Switch
    • Removal and Installation