Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Clutch: All Technical Service Bulletins
A/T - Piston Seals Cut/Leaking
GMC NUMBER:
88-T-63
GROUP:
7A - Automatic Transmission
DATE:
December, 1987
CORPORATE
NUMBER:
877107
SUBJECT:
PISTON SEALS CUT/LEAKING - SERVICE AND PARTS INFORMATION FOR NEW ALUMINUM DIE CAST PISTONS
MODELS:
1978-1988 C/K, R/V, G AND P MODELS EQUIPPED WITH THM 400/475 AUTOMATIC TRANSMISSIONS
BULLETIN COVERS:
Service and parts information for new aluminum die cast pistons used in the THM 400/475 forward, direct, and intermediate clutches. The new pistons
reduce the occurrence of a cut and/or leaking seal.
FIGURE 1 - THM 400 TRANSMISSION IDENTIFICATION INFORMATION
DATE OF CHANGE: (Figure No. 1)
July 21, 1987 (Julian date 202) for all 1987 and 1988 THM 400/475 transmission models.
