G 10 Van V8-350 5.7L (1985)
Beginning August 1, 1988 (Julian Date 213) all 1989 THM 400/475 transmissions were built with the new pump bushing.
IMPORTANT:
When replacing the pump bushing (003) it is required that the pump seal (002) also be changed at this time. (Figure 2)
SERVICE PARTS INFORMATION:
Part No. Part Description
8623940
THM 400/475 Bushing-Pump Body
Parts are currently available from GMSPO.
8670283
Helixseal Assembly-Oil (optional with 8670284)
SERVICE MANUAL REFERENCE:
Refer to the Unit Repair section of the appropriate Service Manual for the proper pump bushing and seal replacement procedures.
