Dodge 2001 Ram 1500 Owner's Manual page 1681

21 - 46 MANUAL - NV4500
MANUAL - NV4500 (Continued)
SHIFT PATTERN
The shift pattern is in a modified H pattern (Fig.
2). Overdrive fifth and reverse gears are in line and
outboard of the first through fourth gear positions.
Fig. 2 NV4500
GEAR RATIOS
GEAR
FIRST
SECOND
THIRD
FOURTH
FIFTH
REVERSE
IDENTIFICATION
The transmission identification tag is attached to
the driver side PTO cover (Fig. 3).
The tag provides the transmission model number,
build date and part number. Be sure to reinstall the
I.D. tag if removed during service. The information
on the tag is essential to correct parts ordering.
OPERATION
The manual transmission receives power through
the clutch assembly from the engine. The clutch disc
is 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 trans-
mission countershaft through the mesh of fourth
speed gear on the input shaft and the fourth counter-
shaft 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 move-
ment moves the internal transmission shift compo-
nents 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 synchro-
nizer sleeve. As the shift fork moves the synchronizer
sleeve, the synchronizer begins to speed-up or slow
RATIO
5.61:1
3.04:1
1 - PTO COVER
1.67:1
2 - I.D. TAG
1.00:1
0.75:1
down the selected gear (depending on whether we are
5.04:1
up-shifting or down-shifting). The synchronizer does
this by having the synchronizer hub splined to the
mainshaft, or the countershaft in some cases, 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 synchronizer.
DIAGNOSIS AND TESTING - MANUAL
TRANSMISSION
LOW LUBRICANT LEVEL
result of a leak, inadequate lubricant fill or an incor-
rect lubricant level check.
case, adaptor or extension housing, or from the front/
rear seals. A suspected leak could also be the result
of an overfill condition.
ing will be from the housing oil seals. Leaks at com-
ponent mating surfaces will probably be the result of
inadequate sealer, gaps in the sealer, incorrect bolt
tightening or use of a non-recommended sealer.
Fig. 3 Identification Tag Location
A low transmission lubricant level is generally the
Leaks can occur at the mating surfaces of the gear
Leaks at the rear of the extension or adapter hous-
BR/BE