Chevrolet 1980 Light Duty Truck Repair Manual page 374

7B-28 M A N U A L TR A N SM IS S IO N
Fig, 7B -3K -R em oving Reverse S hifte r S ha ft Lock Pin
13. Shift first-second and third-fourth clutch sliding
sleeves forward to permit adequate clearance for mainshaft
removal. Remove mainshaft and rear bearing retainer
assembly from the transmission case.
14. Remove front reverse idler gear and thrust washer
from case. Gear teeth face toward front of transmission.
15. Using a dummy shaft J-24658 drive countergear
shaft out of countergear (Fig.
countergear and tanged thrust washers from case. Check
bottom of case for pilot bearings or other loose components.
D IS A S S E M B L Y OF M A IN S H A F T (Fig. 7B-8K)
1. Using snap ring pliers, remove 3-4 clutch assembly
retaining ring at front of mainshaft (Fig. 7B-9K). Slide
washer, synchronizer and clutch assembly, synchronizer
ring 3rd speed gear from mainshaft.
2. Spread rear bearing retainer snap ring (Fig. 7B-10K)
and slide retainer from mainshaft.
3. Remove rear bearing-to-mainshaft snap ring (Fig.
7B-11K).
4. Support mainshaft under 2nd gear and press
mainshaft from rear bearing,
Fig. 7B -4 K -S pe ed om eter Gear and Retaining Rings
O V E R H A U L M A N U A L
7B-7K) and remove
1 1-2
st gear and sleeve, clutch
Fig. 7B -5K -R em oving Reverse Gear
and synchronizer assembly, and the second gear (Fig. 7B-
12K).
C L E A N IN G A N D IN S P E C T IO N
Transm ission Case
1. Wash the transmission thoroughly inside and outside
with cleaning solvent, then inspect the case for cracks.
2. Check the front and rear faces for burrs, and if
present, dress them off with a fine mill file.
3. Make sure bearings are clean, then lubricate with
light engine oil and check them for roughness by slowly
turning the race by hand.
Roller Bearings and Spacers
All main drive gear and countergear bearing rollers
should be inspected closely and replaced if they show wear.
Inspect countershaft and reverse idler shaft at the same
time, replace if necessary. Replace all worn spacers.
Fig. 7B -6K -R em oving M ain Drive Gear Bearing