Transmission and Drivetrain: Technical Service Bulletins
- Customer Interest
- A/T Oil Pan Bolt - Leaks
- A/T - Delayed Upshifts When Cold or Hot
- A/T - Intermittent TCC, MIL ON, and DTC 62/26 Set
- A/T - No Reverse or Slips In Low/Reverse
- A/T - Slip or Shudder on 1-2 Shift, Slip or No 2nd Gear
- A/T - Intermittent Loss of Drive
- A/T - No 3RD Gear (New Thrust Bearing)
- M/T - High Clutch & Shift Effort or Gear Clash
- Clutch System - Slippage/Abnormal Pedal Travel
- A/T - 18-24 MPH 3-2 Tip-In Flare/Slip-Bump
- A/T - 4L60 Binding or Inoperative In Reverse
- A/T - Fluid Leak Near Governor Area Caused By Porosity
- A/T - 4T60 Slipping/No Reverse
- M/T - Knocking or Tapping Noise In All Gear Ranges
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- A/T - No Movement in Drive or 3rd Gear
- By Symptom
- Abnormal wear/deterioration
- Chattering
- Customer Interest
- A/T Oil Pan Bolt - Leaks
- A/T - Delayed Upshifts When Cold or Hot
- A/T - Intermittent TCC, MIL ON, and DTC 62/26 Set
- A/T - No Reverse or Slips In Low/Reverse
- A/T - Slip or Shudder on 1-2 Shift, Slip or No 2nd Gear
- A/T - Intermittent Loss of Drive
- A/T - No 3RD Gear (New Thrust Bearing)
- M/T - High Clutch & Shift Effort or Gear Clash
- Clutch System - Slippage/Abnormal Pedal Travel
- A/T - 18-24 MPH 3-2 Tip-In Flare/Slip-Bump
- A/T - 4L60 Binding or Inoperative In Reverse
- A/T - Fluid Leak Near Governor Area Caused By Porosity
- A/T - 4T60 Slipping/No Reverse
- M/T - Knocking or Tapping Noise In All Gear Ranges
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- A/T - No Movement in Drive or 3rd Gear
- Driveability
- Erratic Operation
- Erratic Shifting
- Hard Shifting
- A/T - On Car Service Info For Harsh 3-2 Downshifts
- Overview
- Bulletin Covers:
- IA. Very Harsh Part Throttle 3-2 Shift At 20-40 MPH --
- IB. Harsh 3-2 and/or 4-2 Shifts
- IC. Intermittent Harsh Part Throttle 3-2 Shift --
- Service Parts Information:
- III. Harsh 3-2 Shift **Low Altitude* Only**
- Service Parts Information:
- Service Manual Reference:
- V.Harsh 3-2 Coastdown Bump 3.8L or 4.5L At 15-22 MPH --
- Service Parts Information:
- A/T - On Car Service Info For Harsh 3-2 Downshifts
- Hard shifting/Stiff clutch
- Incorrect gear selection
- Inoperative
- Leaks
- Loose
- No shift/Incorrect gear engagement
- Noise
- Slipping
- Slipping clutch
- Sticking/Binding
- Warping
- 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
- A/T Oil Pan Bolt - Leaks
- A/T - Repair Guidelines
- A/T - Transaxle Oil Filter Differences
- A/T - New Oil Pump Rotor Thickness
- A/T - Throttle Body Coolant Pipes Service Update
- A/T - 3T40 Center Gearbox Distress, Diagnosis Tips
- A/T - Delayed Upshifts When Cold or Hot
- Engine Controls - Revised Charts C-8A and C-8C (TCC)
- A/T - Intermittent TCC, MIL ON, and DTC 62/26 Set
- Vehicle - Fluid Level General Guidlines
- A/T - 3rd Clutch and Overhaul Kits
- A/T - New Direct & Forward Clutch Fiber Plates
- A/T - New Clutch Plates
- A/T - 4T60 New Input and 3rd Clutch Seals
- A/T - 3T40/125C New Roller Clutch
- A/T - No Reverse or Slips In Low/Reverse
- A/T - 4T60E 3RD Clutch Plate Identifiers
- A/T - Slip or Shudder on 1-2 Shift, Slip or No 2nd Gear
- A/T - Service Information on Distressed 4TH Clutch
- A/T - Final Drive Ratio
- A/T - New Product Information - THM 440-T4
- A/T - Hydra-matic Designation System
- A/T - Product Updates/Production Changes
- A/T - Revised Drive Link Wear Specification
- A/T - Intermittent Loss of Drive
- A/T - No 3RD Gear (New Thrust Bearing)
- A/T - On Car Service Info For Harsh 3-2 Downshifts
- Overview
- Bulletin Covers:
- IA. Very Harsh Part Throttle 3-2 Shift At 20-40 MPH --
- IB. Harsh 3-2 and/or 4-2 Shifts
- IC. Intermittent Harsh Part Throttle 3-2 Shift --
- Service Parts Information:
- III. Harsh 3-2 Shift **Low Altitude* Only**
- Service Parts Information:
- Service Manual Reference:
- V.Harsh 3-2 Coastdown Bump 3.8L or 4.5L At 15-22 MPH --
- Service Parts Information:
- A/T - SRTA Model Update
- A/T - Service Replacement Transaxle Update
- A/T - Core Return Product Feedback Form
- A/T - New I.D. Codes & New Overhaul Packages
- A/T - 4T60 3-2 Tip-In Flare/Slip-Bump at 18-24 MPH
- A/T - 4T60/440T4 Changes For 1988
- A/T - Late 1988 GM 4T60/440T4 Changes
- A/T - 440T4/F7 New Governor Screen Added To Case
- A/T - 440T4/F7 No Third Gear
- A/T - 440T4 Input Sprag Replacement
- A/T - 440T4 2-3 Bind-Up/Slips
- A/T - 440T4 Wiring Schematics
- A/T - Engine Vacuum Testing
- A/T - Diagnosing Converter Lock-Up Problems
- Overview
- Test # 1 - Checking For 12 Volts at Terminal -A-
- Test # 2 - Checking For 12 Volts Across Fuse
- Test # 3 - Checking For 12 Volts Across Brake Switch
- Test # 4 - Adjusting/Replacing the Brake Switch
- Test # 5 - Checking Wires For Shorts and Opens
- Test # 6 - Checking For Ground at Terminal -D-
- Test # 7 - Grounding the -D- Wire
- Test # 8 - Checking Cooler Line Pressure or Surge
- Test # 9 - Checking the Solenoid
- Test # 10 - Checking Electrical Switches on Trans.
- Test # 11 - Checking Lockup Apply Valve
- Test # 12 - Checking Signal Oil Circuit
- Test # 13 - Checking the Computer
- A/T - 440T4 No Line Pressure Rise
- A/T - Early Upshift/No Kickdown
- A/T - 440T4/4T60 Spacer Plate Matching
- A/T - How To Use A Pressure Gauge
- A/T - 440T4 Harsh 3-2 Detent Downshift
- A/T - AXOD/E 44T4's and 125's Chain Stretch
- A/T - 440T4 No Second Clutch Switch
- A/T - 440T4 Channel Plate Gasket Blow-Out
- A/T - 440T4 No Upshift/Wrong Gear
- A/T - THM Late or No Upshifts
- A/T - 440T4 Coast-Down Clunk
- A/T - Drive Axle and Wheel Lug Nut Torque Specifications
- A/T - 440T4/4T60 Late or No Upshift
- A/T - No Converter Clutch Apply When Unit Is Hot
- A/T - Converter Clutch Shudder
- A/T - 125C, 440T4 No Upshift
- A/T - Slipping or No-Shift/Metal Sealing Rings
- A/T - Front Bushing Wear
- A/T - 440T4 Plastic Oil Lube Dam
- A/T - 440T4 Converter Regulator Spring Update
- A/T - 440T4 Lock Up And Cruise Control Problems
- A/T - Math Formulas Part I
- A/T - Twenty Steps To Successful Repairs
- A/T - Math Part II
- A/T - 440T4 Soft/Slipping 1-2 Upshift Flare
- A/T - 440T4 Reverse Reaction Plate/Valve Body Strap
- A/T - 440T4 Converter Clutch Shudder
- A/T - Choosing the Right ATF
- A/T - 440T4/4T60 Model Code Information
- M/T - High Clutch & Shift Effort or Gear Clash
- A/T - New Transaxle Fluid
- A/T - Manual Update, Checking ATF Color, Odor & Level
- A/T - Procedure If ATF is Antifreeze Contaminated
- A/T - DEXRON III Fluid Introduction
- A/T - 4T60/4T60E Drive Link Noise
- Clutch System - Slippage/Abnormal Pedal Travel
- A/T - 18-24 MPH 3-2 Tip-In Flare/Slip-Bump
- A/T - 4L60 Binding or Inoperative In Reverse
- A/T - Evaluating Peened Spacer Plates
- A/T - Fluid Leak Near Governor Area Caused By Porosity
- A/T - New Governor Screen Added to Case
- Drivetrain - Recommended Axle Lubricant
- A/T - Revised 1-2 Band Assembly
- A/T - 4T60 New Design Bands
- A/T - New Reverse Band Apply Pin Gage
- A/T - 4T60 Slipping/No Reverse
- A/T - 4T60/3T40 Grinding/Growling On Incline
- Drivetrain - New Seal Protector for Drive Axle R&R
- A/T - Intermittent Slip In Forward/Reverse When Cold
- A/T - Revised End Play Specifications
- M/T - Knocking or Tapping Noise In All Gear Ranges
- A/T - 4T60 New Thermo Element/Setting Procedure
- A/T - New Bottom Pan & Controlled Compression Gasket
- M/T - Hydraulic Clutch Bleeding Procedure Improvement
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- A/T - No Movement in Drive or 3rd Gear
- A/T - Grinding/Growling Noise in Park on Incline
- A/T - Water Or Coolant Contamination Information
- A/T - DEXRON(R)-VI Fluid Information