Michael Bishop:
The design behind the gearbox of the Land Rover was
taken straight from the Rover cars of
the day. One of the more elaborate parts of the earliest
Land Rovers is the transfer box. The
earliest vehicles used a Rover car freewheel in the
front output to power the front differential.
This makes them constant four wheel drive. This works
much like a bicycle ratchet in that it
the freewheel not only supplies power but also allows
for the front wheels to override that
power when they start changing speed in relation to
the rear wheels when going around a
corner. A lock is provided for locking the freewheel
when four wheel drive is needed in
reverse. On a hard surface reversing and turning causes
serious gearbox windup as the
freewheel doesn't do its job in reverse which resulted
in it being dropped from the
specification on the 1951 model.
861989
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The front out put on the transfer box is made up out
of two separate casings. The
inner casing is the housing for the freewheel unit.
The outer casing is the remains of
a pre production two wheel drive/ four wheel drive
selector which meant that the Land
Rover could have had road going two wheel drive, Road
going four wheel drive and
locked four wheel drive in high or low ratio. This
system was simplified to be
constant four wheel drive in all forward gears with
the key ring operating a lock on
the freewheel for four wheel drive in reverse on low
ratio only. On the first 1988
gearbox's the outer casing on the front output inside
still had the dog to operate the
selectable two/four wheel drive but with a spacer
to stop it being selectable. These
parts were removed from the gear box 861989 onwards
and a complete front output
shaft fitted from the freewheel. The ring pull for
four wheel drive in reverse changed
at gearbox No. 06104015. See also the changes at gearbox
No. 16102314 and 16131688.
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862381
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The plate on the top of the transfer case with the
oil filler plug is now held with four
1/4 Whit x 3/4" bolts instead of four
screws
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06100201
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The clutch withdrawal mechanism changed so it can
operate the Borg and Beck
clutch. See the change at
Engine
No. 06100201
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06104015
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The 'Ring Pull' operrating lever for the freewheel
lock for four wheel drive in
reverse is changed to be a push down
lever with a yellow knob for locking the
freewheel in reverse. See also the
change at chassis No. 06103885, on the
basic
model, at chassis
No. 06200094, on the
station wagon
and at chassis No. 06300022 on the
welder
model.
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06106001
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Third gear changed from being the ratio 1.490:1
to being the ratio 1.377:1. It
The drive for the speedometer changed
from being type the bronze slot in type
fitting to being held with three small
bolt type of speedometer cable fitting.
See also the change at chassis No. 06105831, on the
basic
model, at chassis No.
06200141, on the
station wagon
and at chassis No. 06300031 on the
welder
model.
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06106829
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Primary pinion and constant gear changed to suit a
new clutch withdrawal
mechanism. The operating shaft on the
mechanism changed from having corse
splines to having fine spines. The
oil retaining parts for the clutch changed in side
the withdrawal mechanism. The Primary
pinion and constant gear changed in that
out put has a small section of thread
to keep the oil from weeping out along the
shaft.
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16102314
16131688
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The transfer box has been completely changed to
being the selectable two/ four
wheel drive from the constant four wheel drive freewheel
gearbox. See the parts
book for the full details of the changes.
Basically the gears remained the same and
the front out put changed from the
freewheel to the two/four selector. The housing
for the speedometer drive changed
to suit the new transfer box. See also
Basic
models, 16100603, 16160909,
16660787, 16131573 and 16630025,
Station wagons
No.'s 16200001, 16260021 and 16230081 and
welders
No.'s 16300003, 16360007 and 16330002.
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16102393
16131730
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The shield for the primary pinion, part No. 01017
is now fitted before the locking
washer on the pinion shaft.
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26100201
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The bell housing on the front of the gearbox changed
do with a change in the
grommet that cover the right hand
drive clutch operating shaft hole
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26101202
26130387
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The cover for the seal on the front output shaft
flange from the transfer box
changed from being a dust shield, part No. 232669
to being a mud shield, part No.
236074.
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26100908
26130287
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The gearbox mounting arms changed so that the hole
for the top rubber is now
a bolt on part held by two nuts instead of being
the type which were all welded
together.
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26101454
26130447
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The rear transfer case oil seal now has a mud shield,
part No. 236074 added to it in
behind the hand brake drum.
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26110020
26137678
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The bronze distance sleeve for the mainshaft between
second and third gear is changed to be
thicker an try to stop premature failure. Second and
third gears were narrowed to be able to
accomodate the wider distance piece.
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