2001 DODGE RAM lock

(17) Install input shaft snap ring (Fig. 116).
(18) Installnewoil seal in front bearing retainer
with Installer 6448 (Fig. 117).
(19) Apply bead of Mopar silicone sealer or equiv-
alent to flange surface of front bearing retainer (Fig.
118).
(20) Align and install front bearing retainer over
input shaft and onto housing mounting surface (Fig.
119). Verify bolt holes are aligned before seating
retainer.
CAUTION: Be sure sealer does not get into the oil
feed hole in the transmission case or bearing
retainer.
Fig. 113 Shift Shaft Bushing Lock Bolt
1 - SHIFT SHAFT LOCK BOLT
2 - SHAFT SOCKET
Fig. 114 Shift Shaft Detent Plunger
1 - FRONT HOUSING
2 - PLUG
3 - SPRING
4 - PLUNGER
Fig. 115 Backup Light Switch
1 - BACKUP LIGHT SWITCH
Fig. 116 Shaft Snap Ring - Typical
1 - INPUT SHAFT SNAP RING
Fig. 117 Oil Seal In Front Bearing Retainer
1 - INSTALLER 6448
2 - FRONT BEARING RETAINER
21 - 38 MANUAL - NV3500BR/BE
MANUAL - NV3500 (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.
GEAR RATIOS
GEAR RATIO
FIRST 5.61:1
SECOND 3.04:1
THIRD 1.67:1
FOURTH 1.00:1
FIFTH 0.75:1
REVERSE 5.04:1
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 slowdown the selected gear (depending on whether we are
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
A low transmission lubricant level is generally the
result of a leak, inadequate lubricant fill or an incor-
rect lubricant level check.
Leaks can occur at the mating surfaces of the gear
case, adaptor or extension housing, or from the front/
rear seals. A suspected leak could also be the result
of an overfill condition.
Leaks at the rear of the extension or adapter hous-
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. 2 NV4500
Fig. 3 Identification Tag Location
1 - PTO COVER
2 - I.D. TAG
21 - 46 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)

A leak at the front of the transmission will be from
either the front bearing retainer or retainer seal.
Lubricant may be seen dripping from the clutch
housing after extended operation. If the leak is
severe, it may also contaminate the clutch disc caus-
ing the disc to slip, grab and or chatter.
A correct lubricant level check can only be made
when the vehicle is level. Also allow the lubricant to
settle for a minute or so before checking. These rec-
ommendations will ensure an accurate check and
avoid an underfill or overfill condition. Always check
the lubricant level after any addition of fluid to avoid
an incorrect lubricant level condition.
HARD SHIFTING
Hard shifting is usually caused by a low lubricant
level, improper or contaminated lubricants. The con-
sequence of using non-recommended lubricants is
noise, excessive wear, internal bind and hard shift-
ing. Substantial lubricant leaks can result in gear,
shift rail, synchro, and bearing damage. If a leak
goes undetected for an extended period, the first indi-
cations of component damage are usually hard shift-
ing and noise.
Component damage, incorrect clutch adjustment or
damaged clutch pressure plate or disc are additional
probable causes of increased shift effort. Incorrect
adjustment or a worn/damaged pressure plate or disc
can cause incorrect release. If clutch problem is
advanced, gear clash during shifts can result. Worn
or damaged synchro rings can cause gear clash when
shifting into any forward gear. In some new or
rebuilt transmissions, new synchro rings may tend to
stick slightly causing hard or noisy shifts. In most
cases this condition will decline as the rings wear-in.
TRANSMISSION NOISE
Most manual transmissions make some noise dur-
ing normal operation. Rotating gears generate a mild
whine that is audible, but generally only at extreme
speeds.
Severe highly audible transmission noise is gener-
ally the initial indicator of a lubricant problem.
Insufficient, improper or contaminated lubricant will
promote rapid wear of gears, synchros, shift rails,
forks and bearings. The overheating caused by a
lubricant problem, can also lead to gear breakage.
REMOVAL
(1) Disconnect battery negative cable.
(2) Shift transmission into Neutral.
(3) Remove shift boot screws from floorpan and
slide boot upward on the shift lever.
(4) Remove shift lever extension from shift tower
and lever assembly.(5) Remove shift tower bolts holding tower to iso-
lator plate and transmission shift cover.
(6) Remove shift tower and isolator plate from
transmission shift cover.
(7) Raise and support vehicle.
(8) Remove skid plate, if equipped.
(9) Mark propeller shaft and axle yokes for instal-
lation reference and remove shaft/shafts.
(10) Remove exhaust system Y-pipe.
(11) Disconnect speed sensor and backup light
switch connectors.
(12) Support engine with safety stand and a wood
block.
(13) If transmission is to be disassembled for,
remove drain bolt at bottom of PTO cover and drain
lubricant (Fig. 4).
TWO WHEEL DRIVE
(1) Remove nuts/bolts attaching transmission to
rear mount.
(2) Support and secure transmission with safety
chains to a transmission jack.
(3) Remove rear crossmember.
(4) Remove clutch slave cylinder bolts and move
cylinder aside for clearance.
(5) Remove transmission harness wires from clips
on transmission shift cover.
(6) Remove transmission to clutch housing bolts.
(7) Slide transmission and jack rearward until
input shaft clears clutch housing.
(8) Lower transmission jack and remove transmis-
sion from under vehicle.
FOUR WHEEL DRIVE
(1) Disconnect transfer case shift linkage at trans-
fer case range lever. Then remove transfer case shift
mechanism from transmission (Fig. 5).
(2) Support and secure transfer case to transmis-
sion jack with safety chains.
(3) Remove transfer case mounting nuts.
Fig. 4 NV4500 Drain Bolt
1 - PTO COVER
2 - DRAIN BOLT
3 - FILL PLUG
BR/BEMANUAL - NV4500 21 - 47
MANUAL - NV4500 (Continued)

MAINSHAFT AND GEARTRAIN
(1) Move 1-2 and 3-4 synchro sleeves into neutral.
(2) Remove drive gear thrust bearing from forward
end of mainshaft (Fig. 27).
(3) Remove fourth gear clutch gear and synchro
stop ring from mainshaft (Fig. 28).
(4) Roll gear case onto left side (Fig. 29).
(5) To remove mainshaft assembly (Fig. 29) lift
front end of mainshaft slightly.
NOTE: Handling mainshaft carfully because gears
are lose on the mainshaft.
(6) Grasp mainshaft rear splines, then turn spline
end of mainshaft counterclockwise to rotate shaft and
geartrain out of case. Tilt mainshaft outward and
removed from case.
Fig. 25 Pilot Bearing
1 - DRIVE GEAR
2 - MAINSHAFT PILOT BEARING
Fig. 26 Front Bearing Puller
1 - PULLER 6444
2 - RODS 6444-6
3 - JAWS 6447
4 - COLLAR 6444-8
5 - FLANGE 6444-1
6 - DRIVE GEAR
Fig. 27 Drive Gear Thrust Bearing
1 - MAINSHAFT
2 - DRIVE GEAR THRUST BEARING
Fig. 28 Fourth Gear Clutch Gear Stop Ring
1 - FOURTH GEAR SYNCHRO STOP RING
2 - FOURTH SPEED CLUTCH GEAR
21 - 54 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)

case top surface and in the housing/adapter are tight
and in good condition.
Run a tap through the gear case bolt holes if the
threads need minor cleanup. Helicoil inserts can be
used to repair seriously damaged threaded holes if
necessary.
Be sure all case and housing/adapter sealing and
mating surfaces are free of burrs and nicks. This is
especially important as gaskets are not used in the
transmission. Minor nicks and scratches on the seal-
ing surfaces can be dressed off with a fine tooth file
or oil stone.
Replace the gear case or housing/adapter if cracked
or broken. Do not attempt to repair this type of dam-
age by welding or brazing.
Check condition of the countershaft fifth gear com-
ponents. This includes the shift lug and rail located
in the gear case and the rail bushings.
Inspect the gear and hub assembly. Minor burrs
can be cleaned up with an oil stone. However, the
gear and hub assembly should be replaced if the
teeth or splines are excessively worn, or damaged.
The synchro sleeve should also be replaced if worn or
damaged in any way. Do not reuse synchro struts
that are worn or springs that are collapsed or
severely distorted. Replace worn distorted synchro
parts to avoid shift problems after assembly and
installation.
The shift fork should be inspected for evidence of
wear and distortion. Check fit of the sleeve in the
fork to be sure the two parts fit and work smoothly.
Replace the fork if the roll pin holes are worn over-
size or damaged. Do not attempt to salvage a worn
fork. It will cause shift problems later on. Replace
shift fork roll pins if necessary or if doubt exists
about their condition.
The bearings should be examined carefully for
wear, roughness, flat spots, pitting or other damage.
Replace the bearings if necessary.
Inspect the blocker ring and clutch gear. replace
either part if worn or damaged in any way. Also be
sure replacement parts fit properly before proceeding
with assembly.
Examine the 1-2 synchro hub and sleeve for wear
or damage. Replace sleeve and hub if the splines are
worn, chipped or damaged.
Replace the synchro struts if worn, or chipped. Also
replace the springs if collapsed, distorted or broken.
Inspect the mainshaft geartrain components.
Check teeth on all gears, hubs, clutch gears, stop
rings and clutch rings. The teeth must be in good
condition and not worn, cracked or chipped. Replace
any component that exhibits wear or damage.
Examine the synchro stop rings, clutch rings and
clutch gears. Replace any part that exhibits wear,distortion or damage. Replace the clutch rings if the
friction material is burned, flaking off or worn.
Inspect all of the thrust washers and locating pins.
Replace the pins if bent or worn. Replace the wash-
ers if worn or the locating pin notches are distorted.
Check condition of the synchro struts and springs.
Replace these parts if worn, cracked or distorted.
ASSEMBLY
NOTE: Gaskets are not used in the NV4500 trans-
mission. Use MoparTSilicone Sealer or equivalent
on all gear case and extension housing sealing sur-
faces.
COUNTERSHAFT AND REVERSE IDLER GEAR
(1) Install countershaft front bearing cup in case
with Handle C-4171 and Installer 6061-1.
(2) Install front bearing on countershaft with
Installer C-4340 (Fig. 64).
(3) Lubricate countershaft front bearing cup and
cone with petroleum jelly.
(4) Position gear case on end with rear of case fac-
ing up (Fig. 65).
(5) Install countershaft in gear case (Fig. 65).
NOTE: Do not install rear countershaft bearing on
countershaft at this time.
Fig. 64 Countershaft Front Bearing
1 - FRONT BEARING
2 - INSTALLER C-4340
3 - COUNTERSHAFT
BR/BEMANUAL - NV4500 21 - 65
MANUAL - NV4500 (Continued)

(12) Lift countershaft upward and position wood
block between front of shaft and case (Fig. 69).
(13) Install rear bearing cone on countershaft with
Installer C-4040 (Fig. 70).
(14) Remove wood block from under countershaft
and lower countershaft front bearing into front bear-
ing cup.(15) Lubricate countershaft rear bearing cup and
cone with petroleum jelly.
(16) Install countershaft rear bearing cup in gear
case and over rear bearing (Fig. 71). Tap cup into
place with plastic mallet if necessary.
(17) Install countershaft rear bearing plate (Fig.
72).
NOTE: Verify plate is seated in notch in reverse
idler shaft before tightening bearing plate bolts.
Fig. 69 Supporting Countershaft With Wood Block
1 - COUNTERSHAFT
2 - WOOD BLOCK
Fig. 70 Countershaft Rear Bearing
1 - INSTALLER C-4040
2 - REAR BEARING
3 - COUNTERSHAFT
Fig. 71 Countershaft Rear Bearing Cup
1 - COUNTERSHAFT REAR BEARING CUP
Fig. 72 Countershaft Rear Bearing Plate
1 - COUNTERSHAFT
2 - REAR BEARING PLATE
3 - IDLER SHAFT
BR/BEMANUAL - NV4500 21 - 67
MANUAL - NV4500 (Continued)

(18) Apply Mopartsilicone adhesive/sealer to
flange and lip of new cap. Installnewfront bearing
cap in gear case (Fig. 73) with Handle C-4171 and
Installer C-3972-A.
COUNTERSHAFT END PLAY
(1) Rotate countershaft 4-5 times to seat bearings.
(2) Mount dial indicator on case. Then position
indicator plunger on end of countershaft and zero
dial indicator (Fig. 74).
(3) Raise countershaft with screwdriver and note
end play reading on dial indicator. End play should
be 0.051 - 0.15 mm (0.002 - 0.006 in.).(4) Remove countershaft rear bearing plate.
(5) Install a end play shim that will provide mini-
mum countershaft end play. Position shim on rear
bearing cup (Fig. 75).
(6) Install countershaft rear bearing plate (Fig.
72).
NOTE: Verify plate is seated in reverse idler shaft
notch and end play shims are still in position
before installing bolts.
(7) Apply 1-2 drops MopartLoc N' Seal or equiva-
lent to threads of rear bearing plate bolts. Then
install and tighten bearing plate bolts to 23 N´m (200
in. lbs.).
SHIFT LUG AND RAIL
(1) Lubricate shift lug and rail with CastroltSyn-
torq.
(2) Insert shift lug rail part way into case.
(3) Install shift lug on rail.
(4) Position shift rail so roll pin notches are
toward outside of case (Fig. 76).
(5) Install roll pin that secures lug to rail (Fig. 76).
MAINSHAFT AND GEARTRAIN
CAUTION: The reverse, 1-2 and 3-4 synchro compo-
nents can be assembled and installed incorrectly.
Follow assembly procedures for component identi-
fication and location.
Lubricate mainshaft bearing surfaces and all bear-
ing assemblies with Castrol Syntorq or with petro-
leum jelly.
(1) Install first snap ring in rear most groove of
mainshaft hub (Fig. 77). This snap ring locates first
gear clutch gear on shaft.
Fig. 73 Countershaft Front Bearing Cap
1 - FRONT BEARING CAP (SEAT WITH WOOD BLOCK)
Fig. 74 Measuring Countershaft End Play
1 - DIAL INDICATOR
2 - COUNTER SHAFT
3 - INDICATOR MOUNTING ARM AND BASE
Fig. 75 Countershaft End Play Shim
1 - REAR BEARING CUP
2 - END PLAY SHIM (SELECTIVE)
21 - 68 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)

NOTE: Four of these snap rings are used to secure
various components on the mainshaft 1-2 synchro
hub. The snap rings are all the same size and are
interchangeable.
(2) Install first gear clutch cone on mainshaft 1-2
synchro hub with recessed side of cone facing front
(Fig. 78). Verify cone is seated against snap ring on
hub.
(3) Install snap ring on mainshaft 1-2 synchro hub
to secure clutch cone (Fig. 79). Verify snap ring is
seated in hub groove and against clutch cone.(4) Support mainshaft in upright position to install
remaining gears, snap rings and synchro compo-
nents. Shaft can be supported in gear case or hole
can be cut in workbench to support shaft.
(5) If 1-2 synchro hub and sleeve were disassem-
bled for service, reassemble hub, sleeve, struts and
springs as follows:
(a) Align and install sleeve on hub. Rotate sleeve
until it slides onto hub. Sleeve only fits one way
and will easily slide onto hub when long slot in
sleeve, aligns with long shoulder on hub (Fig. 80).
(b) Place wood blocks under hub that will raise
hub about 3.5 cm (1.375 in.) above surface of work-
bench. Then allow sleeve to drop down on hub (Fig.
81).
Fig. 76 Shift Lug And Rail
1 - NOTCHES (FOR 5TH GEAR SHIFT FORK ROLL PINS)
2 - LUG RAIL
3 - ROLL PIN HOLE
4 - SHIFT LUG
Fig. 77 First Gear Bearing and Snap Ring
1 - SNAP RING
2 - FIRST GEAR BEARING
3 - MAINSHAFT SYNCHRO HUB
Fig. 78 First Gear Clutch Cone
1 - MAINSHAFT 1-2 SYNCHRO HUB
2 - FIRST GEAR CLUTCH CONE
Fig. 79 First Gear Clutch Cone Snap Ring
1 - FIRST GEAR CLUTCH CONE
2 - MAINSHAFT 1-2 SYNCHRO HUB
3 - CLUTCH CONE SNAP RING
BR/BEMANUAL - NV4500 21 - 69
MANUAL - NV4500 (Continued)