S15/T15 2WD Jimmy V6-173 2.8L (1988)
Shift Solenoid: Technical Service Bulletins
A/T - New Solenoid Assembly & Wiring Harness
GMC NUMBER:
89-T-03
GROUP:
7A-Automatic Transmission
DATE:
November, 1988
CORPORATE
NUMBER:
877138
SUBJECT:
NEW SOLENOID ASSEMBLY AND WIRING HARNESS
MODELS:
1988 C/K, R/V, S/T TRUCKS AND G VANS EQUIPPED WITH THM 700R4 AUTOMATIC TRANSMISSION
TRANSMISSION MODELS: MAM, MDM, MFM, MKM, MLM, MPM, MRM, MWM, MXM, MZM, THM, TJM, TKM, TLM, TUM, TXM
BULLETIN COVERS:
Introduction of a new Solenoid Assembly and Wiring Harness (Type 18) and new Control Valve Assembly for some 1988 THM 700-R4 models (refer to
models listed above). The new control valve assembly uses a plug in place of the 4-3 pulse switch. The function of the 4-3 pulse switch, to momentarily
release the torque converter clutch during a 4-3 down shift, was programmed into the ECM for the 1988 model year. These models had previously used a
Type 15 Solenoid Assembly.
FIGURE NO. 1 - THM 700-R4 TRANSMISSION IDENTIFICATION INFORMATION
DATE OF PRODUCTION CHANGE:
(Figure No. 1)
On April 20, 1988 (Julian Date 111), the 1988 THM 700-R4, THM and TLM models were built with the new Type 18 Solenoid Assembly and Wiring
Harness. Beginning May 9, 1988 (Julian Date 130), the remaining 1988 THM 700-R4 models listed above were built using the new Type 18 Solenoid
Assembly.
