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6-24
PART
6·4
4-SPEED FULLY SYNCHRONIZED
MANUAL TRANSMISSION
Section
Page
Section
Paae
1
Description and Operation
.................
6-24
Disassembly ............................. 6-29
Description
.............................
6-24
Parts Repair or Replacement
..............
6-29
Operation
...............................
6-24
Gear Shift Lever ....................... 6· 32
2 In-Car Adjustment and Repairs
.............
6-25
Synchronizers ......................... 6-33
Gear Shift Linkage Adjustments
...........
6-25
Input Shaft Bearing .................... 6-31
3 Removal and Installation
..................
6-2S
Countershaft Gear Bearings
..............
6-31
Removal
...............................
6-25
Assembly ............................... 6- 32
Installation
..............................
6-26
4 Major Repair Operations
.................
6-27
D
DESCRIPTION AND OPERATION
DESCRIPTION
The Ford designed 4-speed trans-
mission
(Fig.
48) is of the fully syn-
chronized type with all gears except
the reverse sliding gear being
in
constant mesh. All forward-speed
changes are
accomplished
with
syn-
chronizer sleeves. The synchronizers
will enable quicker shifts, greatly re-
duce gear clash, and permit down-
shifting into any forward-speed gear
while the vehicle is moving.
The shift linkage is mounted
directly on
the extension
housing
(Fig. 50) and enters the driver's com-
partment through an opening in the
floor pan. A flexible rubber dust boot
(Fig. 50) is provided to seal the
driver's compartment from the ex-
terior.
The shift pattern is shown on the
top of the gear shift lever knob. A
safety measure is incorporated in
the shift mechanism which prevents
accidental engagement of reverse
gear, this consists of a spring which
resists movement of the lever from
the neutral position, reverse being
selected by moving the lever against,
and over-riding the spring tension.
All forward-speed gears in the trans-
mission are helical-type, however, the
reverse sliding gear and the exterior
of the first- and second-speed syn-
FIG. 41-Four-speed Transmission-Typical
chronizer sleeve are spur-type gears.
A transmission service identifica-
tion tag is located on the right
side
of
the case at the front. The first line on
the tag will show the transmission
model and service identification code
when required. The second line will
show the transmission serial number.
OPERATION
In first-speed
(Figure
49), the first-
and second-speed synchronizer
sleeve
is moved rearward by the
shift
fork.
The sleeve engages the first-speed
blocking ring, which acts as a cone
clutch applied to the free-wheeling
first-speed gear. This action speeds
up or slows down the first-speed gear
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