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6-18
PART
6·3
3
SPEED FULLY SYNCHRONISED MANUAL
SHIFT
TRANSMISSION
SERIES BW 199332
& 199331
Section
Section
1
De~cription
r.nd Operation
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Page
6-18
4 Major Repair Operations
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Disassembly
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Page
6-20
6-20
6-20
6-20
2 In-Car Adjustments
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6-19
Replacement
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3 Removal and Installation
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6-19
Assembly
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0
DESCRIPTION
AND OPERATION
DESCRIPTION
l.r.
SP EED
The 3
·
00 Model three-speed trans-
mission is used for 6 cylinder engines
and V8 engined
vehicles.
The desig-
nation 3 · 00
is
the actual distance
between the centreline of the counter-
shaft and the centreline of the input
shaft.
2"
~
3., SPEED
SYNCHRO
NIZER
2 ..
SPEED
GEAR
br
S. REV
ERSE
A transmission
service
identifica-
tion plate
(Fig.
5, page 6-9 ) is
located on the left side of the ex-
tension housing at the rear. The first
line on the tag will show the trans-
mission model and
service
identifica-
tion code when required.
This transmission is of the fully
synchronized type, with all gears
except the reverse gear and sleeve
being in constant mesh. All forward-
speed changes are accomplished with
synchronizer sleeves (Fig. 36) in-
stead of sliding gears. The synchro-
nizers enable quicker-shifts, elimin-
ates gear clash and permit easy
engagement of low gear at low
vehicle speeds.
The forward-speed gears are heli-
cal-cut and are in constant mesh
(Fig. 36). Gears used in the reverse
gear train are spur-cut and are not
synchronized.
Ball bearings support the input
shaft and gear and the centre of the
output shaft (Fig. 36). Roller bear-
INP UT SHAFT
AND
GE~
R
FIG. 36-Gear Train Layout
ings in the input shaft bore support
the front of the output shaft. The
countershaft gear (cluster gear) runs
on three rows of roller bearings. A
bronze bushing is used in the reverse
idler gear on 6 cylinder and roller
bearings for 8 cylinder.
A bushing located at the rear of
the extension housing supports the
rear of the output shaft.
Synchronizers and blocking rings
GE~
. .
R
/
5LI
W IG
SLEEVE &
GEAR
OUTPUT
SHAF1 BEARING
\
CLUSTER
G
EAR
are the conventional tapered ring and
straight clutch gear type
(Fig.
17,
page 6-l3and Fig. 39,page6:2l).
The shift forks, detent mechanism,
and related parts are provided in the
transmission case (Fig. 37).
OPERATION
When the first-speed gear is selec-
ted, the shift lever moves the reverse
gear and sleeve forward and forces
the synchronizer blocking ring coni-
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