A/T - Revised Rocker-Joint Drive Link/Driven Sprocket
Bulletin: 93-74T60-7Date: July '93
Ref.No.: 93-170-74T60
Corp.Ref.No.: 377107
SUBJECT:
NEW ROCKER-JOINT DRIVE LINK AND DRIVE/DRIVEN
SPROCKET ASSEMBLY (INFORMATION)
MODELS AFFECTED:
1993 CENTURY, REGAL, RIVIERA, LESABRE, AND PARK AVENUE/ULTRA EQUIPPED WITH 4T60 AND 4T60E TRANSMISSIONS
SERVICE INFORMATION: (Figure 1 and 2)
A new Rocker-Joint Design Drive Link Assembly (510/507) has been released for all 1993 HYDRA-MATIC 4T60 (RPO ME9) and select 1993 HYDRA-MATIC 4T60-E (RPO M13) transaxles.
Due to the unique Rocker-Joint drive link configuration, it was necessary to change the tooth geometry on the drive and driven sprockets.
NOTE:
A Rocker-Joint drive link assembly cannot be used on a transaxle that previously had a Round Pin drive link unless the drive and driven sprockets have been updated (or vice versa).
NOTE:
If a Rocker-Joint link is assembled on a unit without updating the drive and driven sprocket (or vice versa), wear on the sprockets and drive link will be greatly increased. Also, drive link noise may also increase to the level that may be considered unacceptable.
Rocker-Joint Advantages Over Round Pin Drive Link Design
* Low friction of design permits smoother operation at high speeds.
* Reduced chain wear.
* Higher efficiency at continuous speeds.
DATE OF PRODUCTION CHANGE: (Figure 1 and 2)
The new Rocker-Joint design was implemented into production on December 21, 1992 (Julian Date 356).
Drive/Driven Sprocket Implementation Date
37/33 Sprocket Ratio - December 21, 1992
33/37 Sprocket Ratio - December 21, 1992
35/35 Sprocket Ratio - may be implemented mid-year 1994
IDENTIFICATION OF PARTS: (Figure 3)
SERVICE PART INFORMATION:
Parts are expected to be available on July 26, 1993.
SERVICE MANUAL INFORMATION:
Refer to the appropriate service manual section, Automatic Transaxle On-Vehicle Section 7A for proper on vehicle service to remove and replace a 4T60/4T60-E transaxle. Refer to Automatic Transaxle Unit Repair Section for proper disassemble and assemble procedures.
LABOR TIME INFORMATION:
Labor time should be charged under Operation Number K-7520 for "Link Assembly, Transaxle Drive - Replace":
INC:
Cooler line flush, oil pressure test, clean and inspect parts and all necessary measurements and adjustments.
NOTE:
For check and adjust toe-in, refer to operation E2000 and add the applicable times to the regular hours column. Applies to Regal only.