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TRANSMISSION-"-SPEED
MANUAL
21 -23
(3) Remove the back-up light switch.
(4) Using holding tool C-3281, remove the compan-
ion flange attaching nut and washer, then slide the
flange from the end of the mainshaft (output).
Gearshift Housing
and
Mechanism
(1) Remove the bolts that attach the gearshift hous-
ing to the transmission case (Fig. 41). With all the le-
vers in the neutral detent position, pull the housing
out and away from the case. (The first and second,
third and fourth shift fork may remain in engagement
with the synchronizer sleeves.) Work the forks out of
the sleeves and remove from the case. Discard the
housing gasket.
The following three steps need only be done, if oil
leakage is visible around the gearshift lever shafts.
(2) Remove the nuts, lockwashers and flatwashers
that attach the first and second, third and 4th speed
shift operating levers to the shafts. Disengage the
shift levers from the flats on the shafts and remove.
CAUTION:
Make sure the shafts are free of burrs
before removal; otherwise the bores may be scored
resulting in leakage after reassembly.
(3) Carefully push the gearshift lever shafts out of
the housing, allowing the detent balls to fall free.
Remove the seals and discard.
(4) Slide the gearshift interlock sleeve, interlock
pin and spring out of the housing.
Extension Housing
and
Mainshaft
(1)
Remove the bolts that attach the extension hous-
ing to the transmission case.
(2) Slide the third and fourth synchronizer sleeve
slightly forward, then using a soft hammer, tap on
the extension housing (in a rearward direction). Slide
the housing and mainshaft assembly out and away
from the case (Fig. 42).
GASKET
EXTENSION HOUSING
*'
LT
64x741
Fig. 42-Removing
or
Installing Extension
Housing and Mainshaft Assembly
225
and
273
cubic inch engine equipped vehicles:
Tap the extension housing to break it loose from the
transmission case, then rotate the housing to expose
the end of the countershaft. Drive the countershaft
re'arward out of the case with arbor, Tool C-3938.
This allows the countershaft gear to be lowered to the
bottom of the case to provide clearance for mainshaft
assembly removal.
(3) Refer to Fig. 43 for location of the various
gears, synchronizer sleeves and clutches before dis-
assembling the mainshaft.
(4) Using a pair of snap ring pliers, remove the
snap ring (Fig. 44), that retains the 3rd and 4th syn-
chronizer clutch gear and sleeve, slide 3rd and 4th
synchronizer assembly off the end of the mainshaft.
(5)
Slide the 3rd speed gear and stop ring off the
mainshaft. (Do not separate the 3rd and 4th speed
synchronizer clutch gear, sleeve, shift plates or springs
unless inspection reveals a replacement part is re-
quired.)
(6) Using a suitable pair of long nose pliers, com-
HOUSING
MAINSHAFT
'
64x742
3RD AND 4TH
I
CLUTCH SLEEVE 3RD SPEED GEAR (29 TEETH)
Fig. 43-M
ainshaft Gear Identification
3RD AND 4TH SPEED SYNCHRONIZER CLUTCH GEAR
64x743
Fig. 44-Disassembling
Mainshaft
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