TCC APPLIES DURING 1-2 SHIFT (REPLACE CONTROL VALVE BODY). GMC Truck S15 Pickup - 4WD 1988

For 1990-2009 cars

# TCC APPLIES DURING 1-2 SHIFT (REPLACE CONTROL VALVE BODY)

Subjet: TCC APPLIES DURING 1-2 SHIFT (REPLACE CONTROL VALVE BODY ASSEMBLY FOR SERVICE)

#### Model and Year: 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.

#### 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.

#### 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.

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