K 3500 Truck 4WD V8-305 5.0L (1988)
FIGURE 2 - THM 700-R4 WIRING DIAGRAM
DATE OF PRODUCTION CHANGE: (Figure 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.
SERVICE NOTES:
Any 1988 THM 700-R4 transmission models built with the Type 18 Solenoid Assembly, refer to models and Julian Dates listed above, must be serviced
with the Type 18 Solenoid Assembly and Wiring Harness Complete listed under "Service Parts Information".
Any 1988 THM 700-R4 transmission model built with a Type 15 Solenoid Assembly may be serviced with the new Type 18 assembly; however, there
will be no wire connection for the 4-3 pulse switch. The 4-3 pulse switch, which can be left installed, will then function as a plug.
SERVICE PARTS INFORMATION:
Part No.
Description
10478100
Type 18 Solenoid Assembly - Complete
8654415
Type 15 Solenoid Assembly - Complete
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Please update the 1988 THM 700-R4 Hydraulic Diagnosis section of your service manual accordingly.