Suburban 1/2 Ton 2WD V8-350 5.7L (1986)
Band: Technical Service Bulletins
A/T - New 2-4 Band Apply, Anchor Brackets, Lube Window
Number:
90-121-7A
Section:
7A
Date:
December 1989
Corporate Bulletin No.: 977161
Subject:
2-4 BAND CHANGES-APPLY/ANCHOR BRACKETS AND NEW LUBE WINDOW
Model and Year:
1982-90 LIGHT DUTY TRUCKS WITH 4L60 (700-R4) AUTOMATIC TRANSMISSION
Figure 1 - 2-4 Band Assembly
Figure 2 - THM 700-R4/HYDRA-MATIC 4L60 Transmission Identification Information
TO:
ALL CHEVROLET DEALERS
This bulletin covers a new HYDRA-MATIC 4L60 transmission 2-4 band with changes to the apply and anchor brackets, locating tabs, and the addition
of a "lube window." The lube window was added to direct lubricating transmission fluid to the band friction material while the band is not applied.
Structural changes to the apply and anchor brackets increase their durability and the locating tabs were added to aid in assembly. (See Figure 1.)
Starting September 8, 1989 (Julian Date 251), all HYDRA-MATIC 4L60 transmissions were built using the new 2-4 band assembly. (See Figure 2.)
