2001 DODGE RAM Service Repair Manual

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Page 1697 of 2889

DODGE RAM 2001 Service Repair Manual (16) Remove first gear clutch cone (Fig. 55).
(17) Remove first gear clutch gear rear snap ring
from mainshaft hub (Fig. 55). Do not remove this
snap ring unless mainshaft is to be replaced.
(18) To r

Page 1698 of 2889

DODGE RAM 2001 Service Repair Manual (25) Remove reverse gear thrust washer (Fig. 58).
(26) Remove reverse gear and synchro components
as assembly (Fig. 59). Do not disassemble synchro
components unless they are damaged. If synchro
sleev

Page 1699 of 2889

DODGE RAM 2001 Service Repair Manual (31) Remove first gear from bearing and mainshaft
(Fig. 62).
(32) Remove first gear bearing from mainshaft
(Fig. 63).
CLEANING
Clean the gears, shafts, shift components and
transmission housings with

(31) Remove first gear from bearing and mainshaft
(Fig. 62).
(32) Remove first gear bearing from mainshaft
(Fig. 63).
CLEANING
Clean the gears, shafts, shift components and
transmission housings with a standard parts clean-
ing solvent. Do not use acid or corrosive base sol-
vents. Dry all parts except bearings with compressed
air.
Clean the shaft bearings with a mild solvent such
as Mopartdegreasing solvent, Gunk, or similar sol-
vents. Do not dry the bearings with compressed air.
Allow the bearings to either air dry, or wipe them dry
with clean shop towels.
INSPECTION - TRANSMISSION
Inspect the reverse idler gear, bearings, shaft and
thrust washers. Replace the bearings if the rollers
are worn, chipped, cracked, flat-spotted or brinnelled.
Or if the bearing cage is damaged or distorted.
Replace the thrust washers if cracked, chipped or
worn. Replace the gear if the teeth are chipped,
cracked or worn thin.
Inspect the drive gear and bearings. Minor
scratches and burrs on the gear surfaces can be
reduced with an oil stone and 400 grit paper wetted
with oil. Replace either bearing if worn, or damaged.
Replace the gear if any teeth, splines, or bearing sur-
faces are also worn or damaged.
Inspect the front bearing retainer and bearing cup.
Replace the bearing cup if scored, cracked, brinnelled
or rough. Check the release bearing slide surface of
the retainer carefully. Minor corrosion, nicks, or pit-
ting can be smoothed with 400 grit emery and pol-
ished out with crocus cloth. Wet the abrasive paper
and crocus cloth with oil when smoothing/polishing.
Replace the retainer if worn or damaged in any way.
Do not reuse original retainer bolts. Install new bolts
during assembly.
Inspect the countershaft and bearings. Replace the
bearings if worn, rough, flat spotted or heat checked.
Check the countershaft gear teeth carefully. Small
nicks, scratches or burrs can be removed with an oil
stone and 400 grit paper wetted with oil. Replace the
shaft if any of the teeth are worn, cracked, broken or
severely chipped.
Be sure to check condition of the countershaft bear-
ing cups. Replace either bearings cup if worn, or
damaged.
Check condition of the mainshaft. Inspect all the
bearing surfaces, splines and threads. Also check con-
dition of the snap ring grooves in the hub area and
the speedometer drive gear teeth. Minor scratches or
burrs can be removed with an oil stone and polished
with crocus cloth. However, replace the shaft if any
surfaces exhibit considerable wear or damage.
Check condition of the gear case and extension or
adapter housing. Be sure the alignment dowels in the
Fig. 61 Reverse Clutch Gear
1 - REVERSE CLUTCH GEAR
Fig. 62 First Gear
1 - FIRST GEAR
Fig. 63 First Gear Bearing
1 - MAINSHAFT
2 - FIRST GEAR BEARING
21 - 64 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)

Page 1700 of 2889

DODGE RAM 2001 Service Repair Manual 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 seriou

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)

Page 1701 of 2889

DODGE RAM 2001 Service Repair Manual (6) Lubricate reverse idler gear bearings with
petroleum jelly and install first bearing and second
bearing (Fig. 66).
(7) Install idler gear front thrust washer on boss
in gear case (Fig. 66). Coat t

Page 1702 of 2889

DODGE RAM 2001 Service Repair Manual (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

Page 1703 of 2889

DODGE RAM 2001 Service Repair Manual (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 c

(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)

Page 1704 of 2889

DODGE RAM 2001 Service Repair Manual 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

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