S15/T15 2WD P/U V6-262 4.3L (1988)
Torque Converter Clutch: Technical Service Bulletins
A/T - TCC Applies During 1-2 Gear Shift
GMC NUMBER:
88-7A-218
GROUP:
7A Automatic Transmission
DATE:
July, 1991
CORPORATE
NUMBER:
177112R
SUBJECT:
TCC APPLYS DURING 1-2 SHIFT (REPLACE CONTROL VALVE BODY ASSEMBLY FOR SERVICE)
MODELS:
1988 S/T, G, R 700-R4 SRTA TRANSMISSION
Some 1988 Service Replacement Transmission Assemblies (SRTA) may have been built with a bore plug in the TCC valve bore. The 8MHM, 8TAM,
8TBM, and 8TNM models should have the TCC shift valve lineup in this bore instead of the bore plug. If the bore plug is present, TCC will apply
during the 1-2 shift.
Figure 1 - Control Valve Body
Service Information:
If the control valve assembly contains a bore plug in place of the TCC shift valve lineup, the control valve assembly must be replaced. (See Figure 1).
Service Parts Information:
Reference the GMSPO Service Parts Catalog for the correct control valve assembly part number.
Service Manual Reference:
Refer to the THM 700-R4 Automatic Transmission Unit Repair Section of the appropriate Service Manual for instructions on replacing the control valve
assembly.
