Page 1465 of 2255
(2) Remove countershaft end play shim and rear
bearing cup (Fig. 31).
(3) Remove reverse idler shaft (Fig. 32).
(4) Rotate countershaft outward and push reverse
idler gear away from countershaft and toward front
of case (Fig. 33).
(5) Remove idler gear (Fig. 34).
(6) Keep reverse idler gear bearings and spacer
together (Fig. 35). Insert idler shaft through gear and
bearings to keep them in place.
Fig. 31 Countershaft End Play Shim And Rear
Bearing Cup
1 - COUNTERSHAFT REAR BEARING CUP
2 - END PLAY SHIM
Fig. 32 Reverse Idler Shaft
1 - REVERSE IDLER SHAFT
Fig. 33 Idler Gear Moved Away From Countershaft
1 - REVERSE IDLER GEAR
2 - COUNTERSHAFT
Fig. 34 Reverse Idler Gear
1 - REVERSE IDLER GEAR
2 - DRIVE GEAR BORE
Fig. 35 Idler Gear Components
1 - BEARINGS
2 - REVERSE IDLER GEAR
21 - 12 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1466 of 2255

(7) Remove idler gear thrust washers from gear
case. Install washers on idler shaft to keep them
together for cleaning and inspection.
(8) To remove countershaft rear bearing ,assemble
Puller Flange 6444-1 and Puller Rods 6444-4 (Fig.
36).
NOTE: Shaft cannot be removed from case until
rear bearing has been removed.
(9) Position first Puller Jaw 6449 on bearing cone
(10) Seat puller flange in notch of puller jaw just
installed on bearing cone
(11) Install second Puller Jaw 6449 on bearing and
in notch of puller flange
(12) Slide Retaining Collar 6444-8 over puller jaws
to hold them in place
NOTE: Retaining collar has small lip on one end
and only fits one way over jaws.
(13) Install Puller 6444 on puller rods, then secure
puller to rods with retaining nuts
(14) Tighten puller bolt to remove bearing from
shaft. If bearing is exceptionally tight, tap end of
puller bolt with copper mallet to help loosen bearing.
(15) Remove bearing puller tools then rotate coun-
tershaft out of gear case (Fig. 37).
(16) ToRemove countershaft front bearing, assem-
ble Puller Flange 6444-1 and Puller Bolts 6444-4
(Fig. 38).
(17) Position first Puller Jaw 6451 on bearing.
(18) Seat puller flange in notch of puller jaw.
(19) Install second Puller Jaw 6451 on bearing and
in notch of puller flange.(20) Slide Retaining Collar 6444-8 over puller jaws
to hold them in place
NOTE: Retaining collar has small lip on one end
and only fits one way over jaws.
(21) Install puller bridge and bolt assembly 6444
on puller bolts and install retaining nuts
(22) Tighten puller bolt to remove bearing from
shaft. If bearing is exceptionally tight, tap end of
puller bolt with mallet to help loosen bearing.
(23) Remove bearing puller tools.
Fig. 36 Countershaft Rear Bearing
1 - COLLAR 6444-8
2 - JAWS 6449
3 - PULLER 6444
4 - WRENCH
Fig. 37 Countershaft And Case
1 - COUNTERSHAFT
Fig. 38 Countershaft Front Bearing
1 - JAWS 6451
2 - COLLAR 6444-8
3 - PULLER 6444
4 - FLANGE 6444-1
BR/BEMANUAL - NV4500 21 - 13
MANUAL - NV4500 (Continued)
Page 1467 of 2255

GEAR CASE
(1) Remove countershaft front bearing cap with
hammer (Fig. 39).
(2) Remove countershaft front bearing cup with
Remover 6454 and Handle C-4171 (Fig. 40).
(3) Remove roll pin that secures shift lug on shift
rail in case (Fig. 41). A small pin punch can be mod-
ified by putting a slight bend in it to drive pin com-
pletely out of shift rail (Fig. 41).
(4) Remove shift lug rail.MAINSHAFT
NOTE: Gear and synchro components can be
installed backwards. Paint or scriber gear and syn-
chro components for installation reference. Then
stack geartrain parts in order of removal.
(1) Remove drive gear thrust bearing from end of
mainshaft, if not previously removed.
(2) Remove 3-4 synchro hub, third gear stop ring
and third gear as an assembly (Fig. 42).
(3) Remove third gear bearing from mainshaft
(Fig. 43).
(4) Remove third gear bearing spacer (Fig. 44).
(5) Remove second gear thrust washer snap ring
from mainshaft (Fig. 44).
Fig. 39 Countershaft Front Bearing Cap
1 - HAMMER
2 - BEARING CAP
Fig. 40 Countershaft Front Bearing Cup
1 - REMOVER 6454
2 - HANDLE C-4171
Fig. 41 Shift Lug Roll Pin
1 - PUNCH
2 - 30É BEND
3 - PIN PUNCH MODIFICATION
4 - SHIFT LUG
5 - SHIFT RAIL
21 - 14 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1468 of 2255
(6) Remove second gear thrust washer (Fig. 45).
Note washer notch for locating pin.
(7) Remove thrust washer locating pin (Fig. 46)
with needle nose pliers.
(8) Remove second gear (Fig. 47).
(9) Remove second gear bearing (Fig. 48).
Fig. 42 Third Gear, Stop Ring, And 3-4 Hub
1 - THIRD GEAR
2 - THIRD GEAR STOP RING
3 - 3-4 SYNCHRO HUB
Fig. 43 Third Gear Bearing
1 - THIRD GEAR NEEDLE BEARING
Fig. 44 Snap Ring And Third Gear Bearing Spacer
1 - SECOND GEAR THRUST WASHER
2 - THRUST WASHER SNAP RING
3 - THIRD GEAR BEARING SPACER
Fig. 45 Second Gear Thrust Washer
1 - SECOND GEAR
2 - THRUST WASHER
3 - SECOND GEAR BEARING
BR/BEMANUAL - NV4500 21 - 15
MANUAL - NV4500 (Continued)
Page 1469 of 2255
(10) Remove second gear clutch cone snap ring
from mainshaft synchro hub groove (Fig. 49).
(11) Remove second gear clutch cone, synchro
clutch ring and synchro stop ring (Fig. 50).
(12) Remove 1-2 synchro hub snap ring (Fig. 51).
(13) Remove 1-2 synchro sleeve, hub, struts and
springs as an assembly (Fig. 52). Note tapered side of
sleeve also goes toward front. Do not disassemble
synchro components unless worn or damaged.
(14) Remove first gear synchro stop ring and
clutch ring (Fig. 53).
Fig. 46 Thrust Washer Locating Pin
1 - THRUST WASHER LOCATING PIN
Fig. 47 Second Gear
1 - SECOND GEAR
Fig. 48 Second Gear Bearing
1 - SECOND GEAR NEEDLE BEARING
Fig. 49 Second Gear Clutch Cone Snap Ring
1 - 1-2 SLEEVE
2 - SNAP RING
3 - SECOND GEAR CLUTCH CONE
Fig. 50 Second Gear Clutch Cone And Ring
1 - 1-2 SLEEVE AND HUB
2 - SYNCHRO STOP RING
3 - CLUTCH RING
4 - SECOND GEAR CLUTCH CONE
21 - 16 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1470 of 2255

(15) Remove first gear clutch cone front snap ring
from mainshaft hub (Fig. 54).
(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 remove mainshaft rear bearing, assemble
Puller Flange 6444-1 and Puller Rods 6444-3 for 4X2
or 6444-4 for 4X4 (Fig. 56).
(19) Position the first Puller Jaw 6445 on the bear-
ing cone.
(20) Seat Puller Flange 6444-1 in notch of first
puller jaw.
(21) Install the second Puller Jaw 6445 on the
bearing cone and puller flange.
Fig. 51 1-2 Sleeve And Hub Snap Ring
1 - 1-2 HUB SNAP RING
2 - 1-2 SLEEVE AND HUB
Fig. 52 1-2 Synchro Sleeve And Hub
1 - 1-2 SLEEVE AND HUB
Fig. 53 First Gear Stop And Clutch Ring
1 - FIRST GEAR CLUTCH RING
2 - FIRST GEAR STOP RING
Fig. 54 First Gear Clutch Gear Front Snap Ring
1 - FIRST SPEED CLUTCH GEAR
2 - CLUTCH GEAR SNAP RING (FRONT)
Fig. 55 First Gear Clutch Gear
1 - CLUTCH GEAR SNAP RING (REAR)
2 - FIRST SPEED CLUTCH GEAR
BR/BEMANUAL - NV4500 21 - 17
MANUAL - NV4500 (Continued)
Page 1471 of 2255

(22) Install Puller 6444 on the puller rods and
secure with nuts.
(23) Hold hex portion of Puller 6444 a wrench (Fig.
57) and tighten screw.
(24) Remove bearing puller tools and rear main-
shaft bearing from output shaft.
(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
sleeve or struts require service, mark position of
sleeve on hub before removal. Correct sleeve position
is important as sleeve can be installed backwards
causing shift problems.(27) Remove reverse gear bearing assembly from
mainshaft (Fig. 59).
(28) Remove reverse gear bearing spacer from
mainshaft (Fig. 60).
(29) Remove reverse clutch gear snap ring (Fig.
60). Tension of this snap ring is considerable. Heavy
duty snap ring pliers will be required to spread the
ring far enough to remove it.
Fig. 56 Mainshaft Rear Bearing Puller
1 - REAR BEARING
2 - FLANGE 6444-1
3 - JAW 6445
4 - COLLAR 6444-85 - MAINSHAFT
6 - PULLER 6444
7 - RODS 6443-3 OR 6444-4
8 - JAW 6445
21 - 18 MANUAL - NV4500BR/BE
MANUAL - NV4500 (Continued)
Page 1472 of 2255
(30) Remove reverse clutch gear (Fig. 61).
(31) Remove first gear from bearing and mainshaft
(Fig. 62).
(32) Remove first gear bearing from mainshaft
(Fig. 63).
Fig. 57 Mainshaft Rear Bearing
1 - JAWS 6445
2 - COLLAR 6444-8
3 - FLANGE 6444-1
4 - MAINSHAFT
5 - PULLER 6444
6 - TIGHTENING WRENCH
7 - HOLDING WRENCH
8 - RODS 6444-3 OR 6444-4
Fig. 58 Reverse Gear Thrust Washer
1 - REVERSE GEAR
2 - THRUST WASHER
Fig. 59 Reverse Gear, Bearing, And Stop Ring
1 - FIRST GEAR
2 - REVERSE GEAR ASSEMBLY
3 - BEARING ASSEMBLY
4 - STOP RING
Fig. 60 Reverse Gear Bearing Spacer And First Gear
Snap Ring
1 - CLUTCH GEAR SNAP RING
2 - REVERSE GEAR BEARING SPACER
BR/BEMANUAL - NV4500 21 - 19
MANUAL - NV4500 (Continued)