Transmission Case - Chevrolet 1980 Light Duty Truck Repair Manual

PULL MAIN
DRIVE GEAR
f o r w a r d
F ig . 7 B - 2 J - R e m o v i n g C l u t c h G e a r B e a r i n g
8. R em ove reverse idler gear stop ring. U se a long drift
or punch through the front bearing case bore and drive the
reverse idler shaft and w oodruff key through the rear o f the
case (Fig. 7B-6J).
D IS A S S E M B L Y OF M A IN S H A F T
1. U sing snap ring pliers, rem ove the 3rd and 4th speed
sliding clutch hub snap ring from m ainshaft and rem ove
clutch assembly, third gear blocker ring and third speed gear
from front o f m ainshaft (Fig. 7B-7J).
2. D ef ess speedom eter retaining clip and slide gear
from mair 't.
2
3. R^ rear bearing snap ring from mainshaft
groove (Fig. 7B-8J).
4. Support first gear w ith press plates and press on rear
o f mainshaft to remove first gear, thrust washer, spring
washer and rear bearing from rear o f m ainshaft (Fig. 7B-9J).
5. R em ove the 1st and 2nd sliding clutch hub snap ring
from the m ainshaft and rem ove the clutch assembly, 2nd
sp e e d blocker ring and 2nd speed gear from
Fig. 7B-3J~Removing Clutch Gear and Mainshaft
F i g . 7 B - 4 J - - R e m o v i n g E x t e n s i o n t o R e a r B e a r i n g S n a p R i n g
m ainshaft (Fig. 7B-10J).
C L E A N IN G A N D IN S P E C T IO N

Transmission Case

1. W ash the transm ission thoroughly inside and outside
w ith cleaning solvent, then inspect the case for cracks.
2. Check the front and rear faces for burrs, and if
present, dress them o ff with a fine m ill file.
Front and Rear Bearings
1. W ash the front and rear ball bearings thoroughly in
a cleaning solvent.
2. Blow out bearings with com pressed air.
N O TICE:
slow ly by hand. Spinning bearings m ay damage the
race and balls.
3.
light engine oil and check them for roughness by slow ly
turning the race by hand.
th e rear o f the
Bearing Rollers
A ll clutch gear and countergear bearing rollers should
be inspected closely and replaced if they show wear. Inspect
counter shaft and reverse idler shaft at the sam e time,
replace if necessary. R eplace all worn washers.
J- 22246
M A N U A L T R A N S M IS S IO N
D o not allow the bearings to spin, turn them
M ake sure bearings are clean, then lubricate with
Fig. 7B-5 J-R e m o vin g Countershaft
7B-19
C O U N T ER
SHAFT
O VE R H A U L M A N U A L