Dodge RAM 1500 1998 Owner's Manual page 1704

DR
TRANSMISSION AND TRANSFER CASE
MANUAL TRANSMISSION - NV3500
MANUAL TRANSMISSION - NV4500
MANUAL TRANSMISSION - NV5600
AUTOMATIC TRANSMISSION - 48RE
AUTOMATIC TRANSMISSION - 45RFE/545RFE
TRANSFER CASE - NV241 GENII
MANUAL TRANSMISSION - NV3500
MANUAL TRANSMISSION - NV3500
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MANUAL TRANSMISSION -
NV3500
DESCRIPTION
The transmission is a medium-duty 5-speed, con-
stant mesh fully synchronized manual transmission
with fifth gear overdrive range. The transmission is
available in two and four-wheel drive configurations.
The transmission gear case consists of two aluminum
housings (Fig. 1). The clutch housing is an integral
part of the transmission front housing.
A combination of roller and ball bearings are used
to support the transmission shafts in the two hous-
ings. The transmission gears all rotate on caged type
needle bearings. A roller bearing is used between the
input and output shaft.
The transmission has a single shaft shift mecha-
nism with three shift forks all mounted on the shaft.
The shaft is supported in the front and rear housings
by bushings and one linear ball bearing. Internal
shift components consist of the forks, shaft, shift
lever socket and detent components
OPERATION
The manual transmission receives power through the
clutch assembly from the engine. The clutch disc is
TABLE OF CONTENTS
page
. . . . . . . . . . 1
. . . . . . . . . . 43
. . . . . . . . . . 88
. . . . . . . . 130
. 311
. . . . . . . . . . . 415
TABLE OF CONTENTS
page
. . . . . . . . . . . . . . . . 3
TRANSMISSION AND TRANSFER CASE
TRANSFER CASE - NV271
TRANSFER CASE - NV243
TRANSFER CASE - NV244 GENII
TRANSFER CASE - NV273
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 39
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 40
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . 40
splined to the transmission input shaft and is turned at
engine speed at all times that the clutch is engaged.
The input shaft is connected to the transmission coun-
tershaft through the mesh of fourth speed gear on the
input shaft and the fourth countershaft gear. At this
point, all the transmission gears are spinning.
The driver selects a particular gear by moving the
shift lever to the desired gear position. This movement
moves the internal transmission shift components to
begin the shift sequence. As the shift lever moves the
selected shift rail, the shift fork attached to that rail
begins to move. The fork is positioned in a groove in the
outer circumference of the synchronizer sleeve. As the
shift fork moves the synchronizer sleeve, the synchro-
nizer begins to speed-up or slow down the selected gear
(depending on whether we are up-shifting or down-shift-
ing). The synchronizer does this by having the synchro-
nizer hub splined to the mainshaft and moving the
blocker ring into contact with the gear's friction cone. As
the blocker ring and friction cone come together, the
gear speed is brought up or down to the speed of the
synchronizer. As the two speeds match, the splines on
the inside of the synchronizer sleeve become aligned
with the teeth on the blocker ring and the friction cone
and eventually will slide over the teeth, locking the gear
to the mainshaft, or countershaft, through the synchro-
nizer.
21 - 1
page
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. . . . . . . . . . . 512
. . . . . . . . . . . . . . . . 542
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