Chevrolet 1980 Light Duty Truck Repair Manual page 367

Fig. 7B-10J--Rem oving 1st and 2nd Synchronizer Snap Ring
1-2
for the synchronizer, the groove is at the same end as
the fork slot. This groove indicates the end of the hub with
a greater recess depth.
Extension Oil Seal or Bushing
I f bushing in rear of extension requires replacement,
remove seal and use Tool J-5778 to drive bushing into
extension housing (Fig. 7B-12J). Using the same tool, drive
new bushing in from the rear. Coat I.D . of bushing and seal
with transmission lubricant, then install new oil seal using
Tool J-5154 (Fig. 7B-13J).
Clutch Gear Bearing Retainer Oil Seal
I f the lip seal in the retainer needs replacement; pry the
oil seal out and replace with a new seal using Tool J-23096
until seal seats in its bore (Figs. 7B-14J and 7B-15J).
SLEEVE
Fig. 7B-1 1J -3 -4 S ynchronizer A ssem bly
Fig. 7B-1 2 J-E x te n sio n Bushing R eplacem ent
Lip of seal must face rear of bearing retainer.
A S S E M B L Y OF M A IN S H A F T (Fig. 7B -16J)
Turn the front of the mainshaft upward. Install the
following components on the mainshaft:
1. Install the third speed gear with clutching teeth
upward; the rear face of the gear will butt against the flange
on the mainshaft.
2. Install a blocking ring with clutching teeth
downward over the synchronizing surface of the third speed
gear. All four blocker rings used in this transmission are
identical.
3. Install the 3rd and 4th synchronizer assembly with
the fork slot downward on the mainshaft until it bottoms
out against flange. Be sure the notches of the blocker ring
align with the keys at the synchronizer assembly.
SPRING
M A N U A L TR A N SM IS S IO N
Fig. 7 B -1 3 J -ln s ta llin g Extension Oil Seal
7B-21
O V E RH A U L M A N U A L