A/T - Revised Unit Repair
Number: 93-142-7ASection: 7A
Date: MARCH 1993
Corporate Bulletin No.: 377116
ASE No.: A2
Subject:
TRANSMISSION UNIT REPAIR
Model and Year:
1993 CAPRICE, CAMARO AND CORVETTE WITH 4L60 AUTOMATIC TRANSMISSION
1993 S/T TRUCKS WITH 4L60 AUTOMATIC TRANSMISSION AND 2.5L ENGINE ONLY
SERVICE UPDATE
BULLETIN COVERS:
New Product Information for 1993 HYDRA-MATIC 4L60 transmissions. This information has been updated since publication of the 1993 Service Manual and should be noted accordingly. Be certain to familiarize yourself with these updates to properly repair the 1993 HYDRA-MATIC 4L60 transmission.
DATE OF PRODUCTION CHANGE:
Beginning with Start of Production 1993, HYDRA-MATIC 4L60 transmissions were built with an improved park to reverse engagement. An added check ball in the reverse passage of the valve body (551) and new spacer plate to case gasket (Ill. 88) and a new spacer plate to valve body gasket (Ill. 89) were all needed for this improvement.
NOTE:
It is very important that the new spacer plate gaskets with the tear drop hole are used for the 1993 HYDRA-MATIC 4L60. If a previous gasket is used on the 1993 models it can block the reverse apply orifice.
SERVICE MANUAL REFERENCE:
Update your 1993 Service Manual with the following illustrations.
Check Ball Location
Page 7A-15A-18
Page 7A-15A-47
Page 7A-15A-48
Page 7A-15A-49
Page 7A-15B-7
Page 7A-15B-51