7–4 Copyright © 1996 General Motors Corp.
AT 500, 1500 SERIES AUTOMATIC TRANSMISSIONS
c. Planetary Gear Unit
NOTE:
•
Models before S/N 5071 include the rear plane-
tary ring gear as part of the planetary gear unit.
Proceed with Steps (1) and (2).
•
For models after S/N 5070, skip Steps (1) and (2)
and proceed with Steps (3) and (4).
(1) Align the internal splines on the first
clutch pack, just installed in the main housing. Apply
air pressure to first clutch feed (refer to Figure 4–5).
Grasp the gear unit (as assembled in Paragraph 6–14)
by the main shaft, and install it into the transmission
housing.
(2) Make sure all the first clutch plate inter-
nal splines are engaged with rear planetary ring gear
53 (Foldout 10,A). Apply air pressure to the first
clutch feed, located just below the valve body oil
tracks (refer to Figure 4–5). Air pressure will lift the
ring gear and gear pack slightly if all the splined plates
are not engaged. Proceed to Paragraph 7–5 and con-
tinue rebuild.
(3) On models after S/N 5070, grasp the
planetary gear unit by the main shaft and lower the
unit into the transmission (Figure 7–6). Mesh the in-
ternal teeth of the previously installed rear ring gear
(Paragraph 7–4
a
(11) through (13)) with the rear plane-
tary carrier pinion teeth. Be sure the unit bottoms.
(4) Install the sun gear shaft assembly (long
splines first) and the front sun gear thrust washer (Fig-
ure 7–7).
7–5. INSTALLATION OF SECOND
CLUTCH AND CENTER SUPPORT
a. Second Clutch Pack
(Foldout 9,B)
(1) Refer to Paragraph 6–17
e
for second
clutch running clearance specifications.
The stack di-
mension procedure is the only method available for
determining proper second clutch running clear-
ance
.
(2) Install the second clutch backplate (Fig-
ure 7–8). Note the location of the single tang in the
single slot in the transmission housing.
Figure 7–6. Installing Planetary Gear Unit
Figure 7–7. Installing Sun Gear Shaft Assembly and
Thrust Washer
(3) Beginning with an internal-splined plate,
alternately install three internal-splined and three ex-
ternal-tanged second clutch plates (Figure 7–8). The
single tangs of the clutch plates must align with the
single tang of the backplate.
H02977
OUTPUT SHAFT
REAR PLANET
PINION
PLANETARY
GEAR UNIT
MAIN SHAFT
H02978
THRUST WASHER SUN GEAR
SHAFT
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