Copyright © 1996 General Motors Corp. 4–13
GENERAL OVERHAUL INFORMATION
4–6. ASSEMBLY PROCEDURES
a. Clutches, Pistons
(1) Establish clutch pack clearances prior to
assembly. After clearances have been established, soak
friction faced clutch plates in transmission fluid for at
least two minutes and install each plate so that any
cone is in the same direction as the cone of the adja-
cent plates.
(2) Apply a generous amount of transmis-
sion fluid to the piston cavity prior to final assembly.
b. Parts Lubrication. During final assembly, lu-
bricate all moving parts with transmission fluid. The
lubricant will help protect the friction surfaces and fer-
rous metals until the unit is in service.
c. External Pipe Plugs, Hydraulic Fittings
(1) New Precoated Plugs. New plugs that
are precoated with Teflon
®
need no preparation for as-
sembly.
(2) Reused or Uncoated Plugs, Hydraulic
Fittings. Prepare the threads with a small amount of
nonhardening sealant, such as Loctite
®
Pipe Sealant
with Teflon
®
, or equivalent. Do not use Teflon
®
tape.
d. Oil-Soluble Grease
Use only oil-soluble grease with a low melting point
(petrolatum) to temporarily retain parts, step-joint
sealrings, scarf-cut sealrings, and hook-type sealrings
during assembly with mating parts. The oil-soluble
grease will help keep the sealrings centered in their
grooves and will help protect the parts from damage.
e. Lip-Type Seals (Metal-Encased)
(1) When replacing metal-encased lip-type
seals, make sure the spring-loaded lip side is toward
the transmission fluid to be sealed in (toward the in-
side of the unit). Coat the inside of the seal with high
temperature grease such as MIL-G-81322, Mobile
Grease No. 28 (Mobile Oil Co.), Aeroshell Grease No.
22 (Shell Oil Co.), or equivalent, to protect the seal
during shaft installation and to provide lubrication
during initial operation.
(2) Allison seals are precoated with a dry
sealant. The sealant is usually colored for easy identifi-
cation. The precoated seals do not require any addi-
tional sealant before installation.
f. Interference-Fit Parts. Assembly of interfer-
ence-fit parts may be accomplished by heating and
chilling the respective parts. The female part can be
heated in an oven or hot transmission fluid bath to
300°F (149°C), and the male part can be chilled in dry
ice. Either one or both parts may require a thermal
process. However, if the chill process is used for a fer-
rous alloy part, coat the components with transmission
fluid to prevent rust due to frost and moisture.
g. Sleeve-Type Bearings and Bushings. The
use of a locking compound such as Loctite
®
Sleeve
Retainer 601, or equivalent, is recommended to retain
bushings and sleeve-type bearings that have press-fit
tolerances.
h. Bearings (Ball or Roller)
(1) W h e n installing a bearing on a shaft,
heat the bearing to 200°F (93°C) in an oven or in a
transmission fluid bath. Bearings must be heated long
enough for sufficient expansion. Heating time is deter-
mined by the size of the bearing. Forty-five minutes is
sufficient for the largest bearing in these transmis-
sions. Use the proper size installation sleeve and a
press to seat the bearing.
CAUTION:
Inaccurate torque can cause leakage and
cracked housings. Tighten all pipe plugs to the
torque specified in the assembly step and on the
exploded views.
CAUTION:
• Do not use gasket-type sealing compounds, fi-
brous greases, or nonsoluble, vegetable-base
cooking compounds any place inside the
transmission or where they could be flushed
into the transmission hydraulic system.
• Do not use any substance as a gasket retainer.
CAUTION:
Do not use high-temperature grease on transmis-
sion internal parts.
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