C 30 1 Ton Pickup 2WD V8-454 7.4L VIN W 4-bbl (1983)
Park Gear: All Technical Service Bulletins
A/T - Grinding Noise In All Ranges/No Drive Condition
Number:
84-86
Section:
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).
