A/T - Poor Reverse Engagement Shift Feel: Overview
87chevy10GMC NUMBER: 87-T-45
GROUP: 7A -Automatic Transmission
DATE: May, 1987
CORPORATE
NUMBER: 777113
SUBJECT: REVERSE ENGAGEMENT SHIFT FEEL
MODELS: ALL 1987 LIGHT DUTY TRUCKS AND 1988 C/K TRUCKS WITH THM 700-R4
AUTOMATIC TRANSMISSIONS
Bulletin Covers:
Changes to the 1987 THM 700-R4 transmission to improve shift feel when REVERSE is selected from any gear range and other new parts in the forward and 3-4 clutch assemblies. These parts changes mean you will have to use new service procedures in this bulletin that are not in the 1987 Service Manual.
FIGURE 1:
Date Of Production Change: (Figure 1) Starting February 9, 1987 (Julian Date 040) all 1987 THM 700-R4 production and Service Replacement Transmission Assembly (SRTA) models were built with new parts in the Reverse, Lo and Reverse, Forward and 3-4 Clutch Assemblies.
Service Action:
Each "SUBJECT" in this bulletin will help you to identify new parts, show how to overhaul the new clutch assemblies and explain which parts can service a 1982 through 1986 and 1987 (before Julian Date 040) THM 700-R4 transmission.
Service Parts Information:
Each "SUBJECT" will give the new part numbers and descriptions for each of the subject clutches.
Service Manual Reference:
The 1987 Service Manual procedures can be used to remove the clutch assemblies from the transmission. Use the information in this bulletin to bench overhaul the clutches.
Service Notes:
IMPORTANT: Also use the information in Bulletin 87-T-28 when assembling any 1987 THM 700-R4 transmission.