Transmission and Drivetrain: Technical Service Bulletins

• By Symptom
  • No shift/Incorrect gear engagement
    • A/T - ZF4HP-22 No Upshift
    • A/T - 3HP22ZF Whine Nise/No-Drive Condition
    • A/T - Slipping or No-Shift/Metal Sealing Rings
  • Noise
    • A/T - 3HP22ZF Whine Nise/No-Drive Condition
  • Sticking/Binding
    • A/T - ZF4HP22 Clutch A (Foward) Failure
• All Technical Service Bulletins
  • A/T, Motor Mounts, & Vibration Dampers - Identification
  • A/T - Replacement Procedures
  • A/T - Rebuilt Replacement Information
  • A/T - ZF 4HP-22 Pressure Tap Locations
  • A/T - ZF4HP22 Pressure Fitting Modification
  • A/T - ZF4HP22 Clutch A (Foward) Failure
  • A/T - How To Use A Pressure Gauge
  • A/T - Engine Vacuum Testing
  • A/T - ZF Orifice Placement
  • A/T - ZF 4HP 22 Valve Body Identification
  • A/T - ZF 4 HP-22 Slipping/No Reverse/3-4 Shuttle Shift
  • A/T - Drive Axle and Wheel Lug Nut Torque Specifications
  • A/T - ZF4HP-22 No Upshift
  • A/T - ZF3HP22 Rear Sprag Assembly Inspection & Re-Use
  • A/T - Front Bushing Wear
  • A/T - ZF 4HP-22 Clutch A (Foward) Failure
  • A/T - Math Formulas Part I
    • Overview
    • Shift Speed and Pressure
    • Speedometer Ratios
  • A/T - Twenty Steps To Successful Repairs
  • A/T - Math Part II
  • A/T - ZF4HP22 Clutch Application Chart
  • A/T - ZF4HP22 Check Ball and Orifice Locations
  • A/T - ZF4HP22 Burning A (Foward) Clutch
  • A/T - Choosing the Right ATF
  • A/T - 3HP22ZF Whine Nise/No-Drive Condition
  • A/T - Unnecessary Replacement 0f Sprag Clutch
  • A/T - Slipping or No-Shift/Metal Sealing Rings