4L80 TRANS. TORQUE CONVERTER DAMPNER SPRING FRACTURED
Subject: 4L80-E TRANSMISSION TORQUE CONVERTER DAMPER SPRING
Models: 1991 R/V 2500 Suburbans and R/V 3500 Crew Cabs Equipped with Automatic Transmissions MT1 (Flint Assembly Only)
General Motors of Canada has determined that all 1991 R/V 2500 Suburbans and R/V 3500 Crew Cabs shipped from Flint Assembly Plant prior to August 18, 1990, and equipped with 4L80-E automatic transmissions, have transmission torque converters which have damper springs which could fracture, resulting in noise and possible transmission failure.
To prevent these transmissions from failing, it will be necessary to install a new torque converter.
VEHICLES INVOLVED:
The following V.I.N.'s are included in this recall:
1GTHR33K3MF700010 1GCGR33K7MF300088 1GCGR33K6MF300115 1GCGR33K1MF300118 1GCGR33K9MF300058 1GNGR26N9MF101292
All affected vehicles have been identified by die VIN listing provided to involved dealers with this bulletin. Any dealer not receiving a listing was not shipped any of the affected vehicles.
DEALER CAMPAIGN RESPONSIBILITY:
Dealers are to perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, age of vehicle, or ownership, from this time forward.
Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service, you are to ensure the campaign correction has been made before selling or releasing the vehicle.
Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.
CAMPAIGN PROCEDURE:
Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.
OWNER NOTIFICATION:
All owners of record at the time of campaign release are shown on the attached computer listing and have been notified by first class mail from General Motors. The listings provided are for campaign activity only and should not be used for any other purpose.
PARTS INFORMATION:
Parts required to complete this campaign should be ordered through regular channels, as follows:
Part Number Description Quantity/Vehicle ----------- -------------------- --------------- 8674193 Torque Converter 1 5.7L Gas Engines or 6.2L Diesel Engines 8674194 Torque Converter 1 7.4L Gas Engines
8661760 Turbine Shaft O-Ring Seal 1
1259475 Dipstick Tube Seal 1
993296 Transmission Fluid As Required
PARTS AND LABOUR CLAIM INFORMATION:
Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card, or DCS transmission in accordance with the following:
Repair Code Description Time Allowance ----------- -------------------------- -------------- 2A R and R Torque Converter 2WD 3.1 hrs. 3A R and R Torque Converter 2WD - 4.2 hrs. Equipped with Skid Plate
Time allowance includes 0.1 hour for dealer administrative detail associated with this campaign. Parts credit will be based on dealer net plus 30% to cover parts handling.
SERVICE PROCEDURE:
REMOVE
Tool Required:
J-21366 Converter Holding Strap
1. Battery (-) negative cable. - Raise the vehicle. 2. Transmission fluid. 3. Shift linkage. 4. Propeller shaft(s), refer to PROPELLER SHAFT (Section 4A). 5. Support bracket at the catalytic converter. - Any other components as needed for clearance. - Support the transmission, and the transfer case if used, with a transmission jack. 6. Transmission crossmember.
IMPORTANT: Do not stretch or damage any wires or other components when lowering the transmission.
7. Transmission far enough for clearance to reach other components. 8. Dipstick tube and the seal. - Cover the opening in the transmission. 9. Electrical connectors from the transmission.
IMPORTANT: Use care not to bend or damage the connector pins.
10. Cooler lines. - Cap all openings in the transmission and the lines. 11. Transfer case shifter (if used) and move it aside, refer to TRANSFER CASE (SECTION 7D). 12. Transmission support braces. - Note the location of the braces, they must be installed in the same positions. 13. Converter housing cover. 14. Torque converter to flexplate bolts.
IMPORTANT: Support the engine with a jack or hoist before disconnecting the transmission.
15. Transmission to engine bolts. - Note the location of any brackets or clips and move them aside. - Slide the transmission straight back off the locating pins and install J-21366 Converter Holding Strap 16. Transmission from the vehicle. 17. Holding strap J-21366 and converter.
CAUTION:
Converter is extremely heavy (65 lbs.) (29.5 kg) when full of fluid. Make sure you have a good clean grip; this will help prevent personal injury.
18. Turbine shaft O-Ring seal.
INSTALL
Tool Required:
J-21366 Converter Holding Strap
1. New turbine shaft O-Ring seal. 2. New torque converter assembly. - With transmission in horizontal position, push new torque converter in until the hub is into the converter seal. - Rotate the transmission to a vertical position (bell housing facing up). - Rotate the converter assembly until it drops into position. 3. Transmission assembly. - Attach J-21366 holding strap to the converter assembly. - Raise the transmission into place and remove J-21366.
IMPORTANT: Do not pinch or damage any wires or other components when raising the transmission.
- Slide the transmission straight onto the locating pins while lining up the torque converter and flexplate.
IMPORTANT: The torque converter must be flush onto the flywheel and rotate freely by hand.
4. Transmission to engine bolts. - All brackets, clips and harnesses must be positioned as they were when removed. - Do not install the dipstick tube or transmission support brace bolts. - Torque bolts to 44 N.m (33 lbs. ft.). 5. Torque converter to flexplate bolts. - Torque bolts to 44 N.m (33 lbs. ft.). - Remove transmission jack. 6. Converter housing cover. - Hook the pan under the lip of the engine oil pan. - Torque bolts to 7 N.m (60 lbs. in.). 7. Transmission support braces. - The braces must be installed in the same positions from which they were removed. - Torque bolts to 90 N.m (66 lbs. ft.). 8. Transfer case shifter (if used), refer to TRANSFER CASE (SECTION 7D). 9. Cooler lines. - Uncover the transmission and cooler line openings. - Do not twist or bend the lines. - Torque fittings to 38 N.m (28 lbs. ft.). 10. Electrical connectors to the transmission.
IMPORTANT: Use care not to bend or damage the connector pins.
11. Dipstick tube and new seal - Uncover the opening in the transmission and install the new seal first. - Install tube retainer bolt and torque to 44 N.m (33 lbs. fL). 12. Transmission crossmember and transmission mount. - Any other components that were removed for clearance. - Torque crossmember and transmission mount bolts to 44 N.m (33 lbs. ft.). - Remove the transmission jack. 13. Support bracket at the catalytic converter. 14. Propeller shaft(s), refer to PROPELLER SHAFT (Section 4A). 15. Shift linkage. 16. New transmission fluid. 17. Battery (-) negative cable. 18. Install Campaign Identification Label.
INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL
Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
