Driveline - Torsional Vibration After TCC Apply

Number: 87-143

Section: 7A

Date: May, 1987
Subject: TORSIONAL VIBRATION AFTER TCC APPLY


Model and Year: 1984-1987 T TRUCKS WITH 2.8L ENGINES AND THM 700-R4 AUTOMATIC

TRANSMISSIONS

TRANSMISSION MODELS:

7TAM, 7TBM

BULLETIN COVERS:

A new torque converter with a 215 lb.ft. pressure plate will reduce driveline torsional vibration on 1984-1987 T trucks in third gear that may begin around 22 mph - 25 mph after the torque converter clutch (TCC) applies and may continue up to approximately 50 mph.

Figure No. 1 - THM 700-R4 TRANSMISSION IDENTIFICATION INFORMATION:

Figure No. 2 TYPICAL CONVERTER:

DATE OF PRODUCTION CHANGE: (Figure No. 1)

Beginning September 12, 1986 (Julian Date 255) 1987 THM 700-R4 transmission models
7TAM, 7TBM were produced with the new torque converter containing the 215 lb.ft. pressure plate (Figure No. 2, Item C).

SERVICE ACTION:

The new torque converter can be used to service any 1984-1987 THM 700-R4 transmission produced prior to September 12, 1986 (Julian Date 255) for 2.8L T truck applications only, that have a torsional vibration condition after the TCC has applied.

SERVICE PARTS INFORMATION:

8656908 Torque Converter Assembly, Complete.