Buick LeSabre 1965 Service Manual page 189

CLUTCH, S-M TRANSMISSION 46000 4-SPEED TRANSMISSION 4 - 5 3
Figure 4-116—Power Flow in Third
4. Operation in Third
In third speed, the first and sec-
ond speed clutch assumes a neu-
tral position. The third and fourth
speed clutch (sleeve) moves rear-
ward to engage the third speed
gear, which is being turned by
the countergear. Because the
third and fourth speed clutch (hub)
is splined to the mainshaft, torque
is imparted to the mainshaft from
the third speed gear through the
c l u t c h assembly. See Figure
4-116.
5. Operation in Fourth
In fourth speed, or direct drive,
the third and fourth speed clutch
(sleeve) is moved forward to en-
gage the main drive gear and the
first and second speed clutch re-
mains in a neutral position. This
engagement of the main drive
gear with the third and fourth
speed clutch assembly imparts
torque directly to the mainshaft.
See Figure 4-117.
6. Operation in Reverse
In reverse speed, both clutch as-
Figure 4-117—Power Flow in Fourth
Figure 4-118—Power Flow in Reverse
semblies assume a neutral posi-
tion. The reverse speed gear is
moved forward to engage the rear
reverse idler gear, which is being
turned by the countergear. Be-
cause the reverse speed gear is
splined to the mainshaft, this en-
gagement causes the mainshaft to
turn; however, because power
flows from main drive gear to
countergear and through reverse
idler gear to reverse speed gear,
the direction of rotation will be
opposite that of the engine. See
Figure 4-118.
4 - 2 6 TRANSMISSION
SIDE COVER
REMOVAL AND
INSTALLATION
NOTE: It is not necessary to
remove transmission from vehicle
for inspection or replacement of
parts in transmission side cover
assembly, but the side cover as-
sembly itself must be removed
from the transmission case.
a. Removal
1. Remove drain plug at the bot-
tom of transmission and drain
lubricant.
2. Disconnect first, second, third
and fourth shift rods from levers.
3. Remove t r a n s m i s s i o n side
cover assembly from transmis-
sion case.
4. Remove the outer shifter lever
nuts and lock washers and pull
levers from shafts.
Figure 4-119—Transmission Side
Cover Assembly
5. Carefully push the s h i f t e r
shafts into cover, allowing the
detent balls to fall free, then re-
move both shifter shafts.
6. Remove interlock sleeve, in-
terlock pin and poppet spring.
7. Replace necessary parts.
b. Installation
1. Install interlock sleeve and one
shifter shaft. Place steel detent
into sleeve followed by poppet
spring and interlock pin.
2. Start second shifter shaft into
position and place second detent
ball on poppet spring. Compress
ball and spring with screwdriver
and push the shifter shaft fully in.
3. With transmission in neutral
and shifter forks and levers in
place, lower side cover into place.
Install attaching bolts, using seal-
er and lower right bolt (see Fig-
ure 4-119), and tighten evenly.
4 - 2 7 REMOVAL AND
INSTALLATION OF
4-SPEED
TRANSMISSION
a. Removal of Transmission
1. If transmission. is to be dis-
assembled, drain transmission
lubricant.