1986 Suburban 4WD V8-305: THM 700-R4 Pump Whine/Moan - TSB 87T32
Figure No. 2 -Ten-Vane Pump Body Assembly
SERVICE PARTS INFORMATION
8649964 - ten-vane pump body assembly (Figure No. 2) 1985-1987 models.
Due to a pump cover casting change in 1985, a 1982 through 1984 THM 700-R4 transmission must be serviced using a complete pump assembly.
Service parts for these earlier model years will be available at a later date.
SERVICE MANUAL REFERENCE
Refer to the oil pump assembly section of the 1987 THM 700-R4 unit repair service manual.
SERVICE NOTES
Seven-vane pump body assemblies, part number 8649950, should normally be used to service 1985 through 1986 THM 700-R4 transmissions until
current service stock is depleted. The ten-vane pump body assemblies should be used for any 1985 through 1986 model exhibiting a whine or moan
condition and all 1987 THM 700-R4 transmission models.
