A/T - Grinding Noise In All Ranges/No Drive Condition
Number: 84-86Section: 7A (VIIc)
Date: Mar., 1984
Subject: GRINDING NOISE IN ALL RANGES OR NO DRIVE CONDITION ON THM 700-R4 TRANSMISSIONS
Model and Year: 1982-84 ALL MODELS WITH THM 700-R4
TO: ALL CHEVROLET DEALERS
Beginning January 9, 1984, all THM 700-R4 transmissions were built with a new reaction internal gear.. This new gear has a change in the parking lugs and internal gear teeth area. Since the new gear is dimensionally the same as the former, gear identification marks have been added.
FIGURE 1 - FRONT VIEW:
FIGURE 2 - SIDE VIEW:
Two types of identification have been used. The first or former being an ink stamp on the top chamfer of the gear (Figure 2A). The second or current being a broached line on three (3) parking lugs equally spaced around the internal reaction gear (see Figure #1 and #2B). All THM 700-R4 transmissions with a build date of Y4009A, B, C or H or after will have the new reaction internal gear.
When replacing the reaction internal gear, order P/N 8654161 (new part number).