Transmission and Drivetrain: Technical Service Bulletins

• Customer Interest
  • A/T - Oil Pan Leaks
  • Differential - Chatter on Acceleration, 8.5 Inch Locking
  • A/T - New Pump to Case Bolt and O-Ring Improves Sealing
  • A/T - Fluid Out Vent Diagnostic Tips
  • A/T - No Drive and Reverse
  • A/T - Fluid Leak Near Front Pump (Bushing Walkout)
  • A/T - THM 400 No Gears or Slipping In All Ranges
  • A/T - Burned Clutches/Cracked Turbine Shaft
  • Engine - Stops Running When Shifting to Reverse or Drive
  • A/T - 4L60 Slipping or No 3rd/4th Gear
  • A/T - Binding or Inoperative In Reverse
  • A/T - Problems T.V. Cable Adjustments Will Not Correct
  • TCC - Engages at Incorrect Speed
  • A/T - Diagnosis for Burned 2-4 Band or 3-4 Clutch
    • Overview
    • I.Diagnosis Procedure For A Slipping 1-2 or No 1-2 Shift
    • II. For A Condition of Slipping 2-3 or No 2-3 Shift or A Combination of That and the Condition Diagnosed In Section I.
  • A/T - Slipping/Loss of Drive Range
  • Slipping Condition - Loss of Drive Range
  • A/T - Buzzing Noise at Idle
  • A/T - Excess Shift Effort
  • M/T - Gear Oil Smell In Vehicles
  • A/T - Harsh Manual 2-1 Downshift/Delayed Downshifts
  • A/T - New Lube Window and Band Apply/Anchor Brackets
  • A/T - Park/Neutral to Reverse Shift Feel
  • A/T - Shudder in Reverse
  • M/T - Clutch Chatter or Shudder in First or Reverse Gear
    • Overview
    • Service Procedure
    • Warranty Information
  • M/T - Neutral/Drive Gear Rattle
  • A/T - Buzzing Noise and Possible Delayed Upshifts
  • A/T - Erratic or No Upshift (New Governor Driven Gear)
  • A/T - 4L60 Stuck In First Gear
  • A/T - No Fourth Gear and/or Burned 2-4 Band Assembly
  • A/T - No Engine Braking In Drive 2 (D2) Selection
  • A/T - Oil Leak at A/T Case to Transfer Case Adapter
  • Drive Axle - Premature Wear
  • A/T - Grinding Noise In All Ranges/No Drive Condition
  • Engine, A/T - Shift/Driveability Concerns/MIL ON
  • A/T - No Movement in Drive or 3rd Gear
• By Symptom
  • Abnormal wear/deterioration
    • A/T - Burned Clutches/Cracked Turbine Shaft
    • A/T - Front Bushing Wear
    • Drive Axle - Premature Wear
  • Chattering
    • M/T - Clutch Chatter or Shudder in First or Reverse Gear
      • Overview
      • Service Procedure
      • Warranty Information
  • Customer Interest
    • A/T - Oil Pan Leaks
    • Differential - Chatter on Acceleration, 8.5 Inch Locking
    • A/T - New Pump to Case Bolt and O-Ring Improves Sealing
    • A/T - Fluid Out Vent Diagnostic Tips
    • A/T - No Drive and Reverse
    • A/T - Fluid Leak Near Front Pump (Bushing Walkout)
    • A/T - THM 400 No Gears or Slipping In All Ranges
    • A/T - Burned Clutches/Cracked Turbine Shaft
    • Engine - Stops Running When Shifting to Reverse or Drive
    • A/T - 4L60 Slipping or No 3rd/4th Gear
    • A/T - Binding or Inoperative In Reverse
    • A/T - Problems T.V. Cable Adjustments Will Not Correct
    • TCC - Engages at Incorrect Speed
    • A/T - Diagnosis for Burned 2-4 Band or 3-4 Clutch
      • Overview
      • I.Diagnosis Procedure For A Slipping 1-2 or No 1-2 Shift
      • II. For A Condition of Slipping 2-3 or No 2-3 Shift or A Combination of That and the Condition Diagnosed In Section I.
    • A/T - Slipping/Loss of Drive Range
    • Slipping Condition - Loss of Drive Range
    • A/T - Buzzing Noise at Idle
    • A/T - Excess Shift Effort
    • M/T - Gear Oil Smell In Vehicles
    • A/T - Harsh Manual 2-1 Downshift/Delayed Downshifts
    • A/T - New Lube Window and Band Apply/Anchor Brackets
    • A/T - Park/Neutral to Reverse Shift Feel
    • A/T - Shudder in Reverse
    • M/T - Clutch Chatter or Shudder in First or Reverse Gear
      • Overview
      • Service Procedure
      • Warranty Information
    • M/T - Neutral/Drive Gear Rattle
    • A/T - Buzzing Noise and Possible Delayed Upshifts
    • A/T - Erratic or No Upshift (New Governor Driven Gear)
    • A/T - 4L60 Stuck In First Gear
    • A/T - No Fourth Gear and/or Burned 2-4 Band Assembly
    • A/T - No Engine Braking In Drive 2 (D2) Selection
    • A/T - Oil Leak at A/T Case to Transfer Case Adapter
    • Drive Axle - Premature Wear
    • A/T - Grinding Noise In All Ranges/No Drive Condition
    • Engine, A/T - Shift/Driveability Concerns/MIL ON
    • A/T - No Movement in Drive or 3rd Gear
  • Difficult gear selection
    • A/T - Excess Shift Effort
  • Driveability
    • Engine, A/T - Shift/Driveability Concerns/MIL ON
  • Erratic Shifting
    • A/T - Problems T.V. Cable Adjustments Will Not Correct
    • A/T - THM 400 Too Sensitive 3-2 Downshift
    • A/T - Erratic or No Upshift (New Governor Driven Gear)
    • Engine, A/T - Shift/Driveability Concerns/MIL ON
  • Hard Shifting
    • A/T - Harsh Manual 2-1 Downshift/Delayed Downshifts
    • A/T - Park/Neutral to Reverse Shift Feel
    • A/T - Harsh Reverse Engagements
  • Incorrect gear selection
    • TCC - Engages at Incorrect Speed
  • Inoperative
    • A/T - No Drive and Reverse
    • A/T - THM 400 No Gears or Slipping In All Ranges
    • A/T - Slipping/Loss of Drive Range
    • A/T - THM 400 No Reverse
    • A/T - Grinding Noise In All Ranges/No Drive Condition
    • A/T - No Movement in Drive or 3rd Gear
  • Leaks
    • A/T Oil Pan Gasket - Eliminates Fluid Leaks
    • A/T - Oil Pan Leaks
    • A/T - New Pump to Case Bolt and O-Ring Improves Sealing
    • A/T - Fluid Leak Near Front Pump (Bushing Walkout)
    • M/T - New Leak Resistant Styrene Rubber Coated Gaskets
    • A/T - Oil Leak at A/T Case to Transfer Case Adapter
  • Loose
    • A/T - THM 400 Rear Band Adjustment Too Loose
  • No shift/Incorrect gear engagement
    • A/T - No Drive and Reverse
    • Engine - Stops Running When Shifting to Reverse or Drive
    • A/T - 4L60 Slipping or No 3rd/4th Gear
    • A/T - Binding or Inoperative In Reverse
    • Input Carrier to Output Shaft Snap Ring - Service
    • A/T - Slipping or No-Shift/Metal Sealing Rings
    • A/T - No Upshift/Governor Contamination
    • A/T - THM 400 No Reverse
    • A/T - Erratic or No Upshift (New Governor Driven Gear)
    • A/T - 4L60 Stuck In First Gear
    • A/T - No Fourth Gear and/or Burned 2-4 Band Assembly
  • Noise
    • Differential - Chatter on Acceleration, 8.5 Inch Locking
    • A/T - Buzzing Noise at Idle
    • M/T - Neutral/Drive Gear Rattle
    • A/T - Buzzing Noise and Possible Delayed Upshifts
    • A/T - Grinding Noise In All Ranges/No Drive Condition
  • Odors
    • M/T - Gear Oil Smell In Vehicles
  • Slipping
    • A/T - THM 400 No Gears or Slipping In All Ranges
    • A/T - 4L60 Slipping or No 3rd/4th Gear
    • A/T - Diagnosis for Burned 2-4 Band or 3-4 Clutch
      • Overview
      • I.Diagnosis Procedure For A Slipping 1-2 or No 1-2 Shift
      • II. For A Condition of Slipping 2-3 or No 2-3 Shift or A Combination of That and the Condition Diagnosed In Section I.
    • A/T - Slipping/Loss of Drive Range
    • Slipping Condition - Loss of Drive Range
    • A/T - Intermittent Downshift, Slip or Busy/Cycling TCC
    • A/T - No Fourth Gear and/or Burned 2-4 Band Assembly
    • A/T - Grinding Noise In All Ranges/No Drive Condition
  • Sticking/Binding
    • A/T - Binding or Inoperative In Reverse
    • A/T - Recurrent Sticking Valves/In Line Filters
    • A/T - 4L60 Stuck In First Gear
  • Vibration
    • Drivetrain - Evaluating Driveline Vibration
      • Overview
      • Diagnosis of Driveline Imbalance
      • Propshaft Runout Specifications
      • Measuring Pinion Companion Flange Runout
      • Companion Flange Compensation Weights
      • Pinion Companion Flange Vectoring (Indexing)
  • Warping
    • A/T - Updated Side Cover Or Bottom Pan Removal
• All Technical Service Bulletins
  • Drivetrain - Information on Driveline Clunk Noise
  • Vehicle - Engine And Sub Systems Flushing Info. (CANADA)
  • Vehicle - Engine And Sub-Systems Flushing Recommendations
  • M/T - Operating Characteristics Information
  • A/T - Fluid Oil Cooler Flow Test
  • A/T - 2-3 Upshift or 3-2 Downshift Clunk Noise
  • A/T - Slight Vehicle Movement In Park At Start Up
  • ACDelco(R) Remanufactured Transmissions - Program Update
    • Overview
    • Warranty Coverage
    • New Warranty Registration
    • Warranty Claim Submission Procedures
  • A/T & M/T - AC Delco Remanufactured Transmissions
    • Overview
    • Warranty Coverage
    • Warranty Claim Submission Procedures
  • Drivetrain - Evaluating Driveline Vibration
    • Overview
    • Diagnosis of Driveline Imbalance
    • Propshaft Runout Specifications
    • Measuring Pinion Companion Flange Runout
    • Companion Flange Compensation Weights
    • Pinion Companion Flange Vectoring (Indexing)
  • Differential Pinion Cross Shaft - R&R When Broken
  • A/T Oil Pan Gasket - Eliminates Fluid Leaks
  • A/T - Oil Pan Leaks
  • A/T - Updated Side Cover Or Bottom Pan Removal
  • Differential Pinion Shaft Locking Screw - Revised
  • Differential - Chatter on Acceleration, 8.5 Inch Locking
  • Differential - Governor Removal Tool Revision
  • A/T - Updated Filter and Seal
  • A/T - New Pump to Case Bolt and O-Ring Improves Sealing
  • A/T - Fluid Out Vent Diagnostic Tips
  • A/T - Updated Oil Pump Assemblies
  • Pump to Case Bolt and O-Ring Assembly - Revised
  • A/T - No Drive and Reverse
  • A/T - Fluid Leak Near Front Pump (Bushing Walkout)
  • A/T - Oil Pump Rotor and Slide Service Procedure
  • A/T - THM 400 No Gears or Slipping In All Ranges
  • A/T - Burned Clutches/Cracked Turbine Shaft
  • Engine - Stops Running When Shifting to Reverse or Drive
  • A/T - 4L60 Slipping or No 3rd/4th Gear
  • A/T - THM 400 Front Pump Interchangeability
  • A/T - Cooler Replacement/Flushing
  • A/T - Binding or Inoperative In Reverse
  • A/T - Revised Link Detent Lever to Manual Valve
  • A/T - Throttle Valve Cable Adjustment
  • A/T - TV Cable Identification (700-R4 Light Duty)
  • A/T - T.V. Exhaust Valve Never Put in Production
  • A/T - Problems T.V. Cable Adjustments Will Not Correct
  • Slip Yoke/U-Joint - Replacement and Servicing
  • Front Wheel Driveshaft Boot - Damage Prevention
  • TCC - Engages at Incorrect Speed
  • A/T - Diagnosis for Burned 2-4 Band or 3-4 Clutch
    • Overview
    • I.Diagnosis Procedure For A Slipping 1-2 or No 1-2 Shift
    • II. For A Condition of Slipping 2-3 or No 2-3 Shift or A Combination of That and the Condition Diagnosed In Section I.
  • A/T - Piston Seals Cut/Leaking
  • A/T - Slipping/Loss of Drive Range
  • A/T - Clutch Bulletin Index
  • Slipping Condition - Loss of Drive Range
  • A/T - Forward Clutch Plate Assembly Modifications
  • A/T Forward Sprag Clutch - Revised
  • A/T - Elimation of Throttle Valve Sleeve
  • A/T - Understanding Identification Information
  • A/T - Identification Information
  • A/T - Buzzing Noise at Idle
  • A/T - Excess Shift Effort
  • M/T - Gear Oil Smell In Vehicles
  • A/T - Harsh Manual 2-1 Downshift/Delayed Downshifts
  • Input Carrier to Output Shaft Snap Ring - Service
  • A/T - 4L60 New Output Shafts and Shaft Seals
  • A/T - New Lube Window and Band Apply/Anchor Brackets
  • A/T Fluid Level Indicator - Revised (Sealed)
  • A/T - Park/Neutral to Reverse Shift Feel
  • A/T - Shudder in Reverse
  • A/T - New Solenoid Testing Kit
  • A/T - Core Return Product Feedback Form
  • A/T Input Housing Assembly - Air Check
  • A/T - Control Valve Without Throttle Valve Sleeve Update
  • A/T - 700-R4 & 400 Improved Governor Driven Gear
  • A/T - 3L80/THM 400 Center Support Bolt
  • A/T - Torque Converter Identification
    • Overview
    • 298 mm Identification
    • 245 mm Identification
  • A/T - Harsh Reverse Engagements
  • A/T - Engine Vacuum Testing
  • A/T - How To Use A Pressure Gauge
  • A/T - Recurrent Sticking Valves/In Line Filters
  • A/T - THM 400 Rear Band Adjustment Too Loose
  • A/T - Rapid Converter Pump Bushing Wear
  • A/T - Methods to Check for Restricted Exhaust
  • A/T - Slipping or No-Shift/Metal Sealing Rings
  • A/T - Front Bushing Wear
  • A/T - THM 400 Too Sensitive 3-2 Downshift
  • A/T - No Upshift/Governor Contamination
  • A/T - THM 400 No Reverse
  • A/T - THM Steel Clutch Piston Inspection
  • A/T - Sprag Rotation
  • A/T - Checking Pressure Switches For Leaks
  • 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 - Choosing the Right ATF
  • M/T - Clutch Chatter or Shudder in First or Reverse Gear
    • Overview
    • Service Procedure
    • Warranty Information
  • M/T - Neutral/Drive Gear Rattle
  • M/T - New Leak Resistant Styrene Rubber Coated Gaskets
  • A/T - New ATF Dexron IIe Information
  • A/T - DEXRON III Fluid Introduction
  • A/T - Intermittent Downshift, Slip or Busy/Cycling TCC
  • A/T - Rear Bushing On-Vehicle Service Procedure
  • A/T - Buzzing Noise and Possible Delayed Upshifts
  • A/T - New Control Valve Assembly Elimination of TCC Bore
  • A/T - Proper Use of Spacer Plate Gaskets In Overhaul Kit
  • A/T - New Control Valve Assembly Identification
  • A/T - Evaluating Peened Spacer Plates
  • A/T - Erratic or No Upshift (New Governor Driven Gear)
  • A/T - 4L60 Stuck In First Gear
  • Drivetrain - Recommended Axle Lubricant
  • A/T - No Fourth Gear and/or Burned 2-4 Band Assembly
  • A/T - New Servo Apply Pin
  • A/T - Accumulator Spring Usage Chart
  • A/T - Consistent Shift Points and Smoothness
  • A/T - Accumulator Pistons & Seals Enhance Shift Points
  • A/T - No Engine Braking In Drive 2 (D2) Selection
  • A/T - 1-2 Accumulator Piston/Outer Spring Replacement
  • A/T - Oil Leak at A/T Case to Transfer Case Adapter
  • A/T - New Case, 2nd, 3rd, 4th Pressure Taps Removed
  • Drive Axle - Premature Wear
  • A/T - THM 700-R4 New Input Housing and Shaft Assembly
  • A/T - Sun Gear Shell and Thrust Washer Identification
  • A/T - THM 700-R4 Checking Pinion Washer For Wear
  • A/T - Grinding Noise In All Ranges/No Drive Condition
  • A/T Case Extension Oil Seal Assembly - Installation
  • M/T - Updated Gaskets
  • M/T - Hydraulic Clutch Bleeding Procedure Improvement
  • Engine, A/T - Shift/Driveability Concerns/MIL ON
  • A/T - 4L60, Revised Sprag/Forward Clutch Hub
  • A/T - No Movement in Drive or 3rd Gear
  • A/T - Water Or Coolant Contamination Information
  • A/T - DEXRON(R)-VI Fluid Information