V 2500 P/U 4WD V8-350 5.7L (1987)
Technical Service Bulletin # 87T457A
Date: 870501
A/T - Poor Reverse Engagement Shift Feel
GMC 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.
Subject: New Reverse Input Housing and Drum Assembly
