Page 1569 of 2158
(2) Remove threaded plugs from intermediate
plate. Then remove lock ball and spring from plug
holes with pencil magnet (Fig. 8).
(3) Remove shift fork pins with punch and hammer
(Fig. 9).
(4) Remove shift rail C-rings (Fig. 10).
Fig. 7 Positioning Intermediate Plate In Vise
Fig. 8 Lock Ball And Spring Removal
Fig. 9 Removing Shift Fork Pin
Fig. 10 Shift Rail C-Ring Removal
JAX 4/5 MANUAL TRANSMISSION 21 - 7
Page 1570 of 2158
(5) Pull No. 4 shift rail outward and remove lock
balls and pin (Fig. 11).
(6) Remove No. 4 shift rail, fifth gear and No. 3
shift fork (Fig. 12).
(7) Pull No. 5 shift rail and shift head out of plate
(Fig. 13).
(8) Remove shift rail No.3.Catch interlock pins
as rail is removed (Fig. 14).
(9) Remove No. 1 shift rail and interlock pin (Fig. 15).
Fig. 11 Removing No. 4 Shift Rail, Lock Balls And
Pin
Fig. 12 Removing No. 4 Shift Rail And Fifth Gear
Shift Fork
Fig. 13 Removing No. 5 Shift Rail And Shift Head
Fig. 14 Removing No. 3 Shift Rail And Interlock Pin
Fig. 15 Removing No. 1 Shift Rail And Interlock Pin
21 - 8 AX 4/5 MANUAL TRANSMISSIONJ
Page 1571 of 2158
(10) Remove shift rail No. 2 and shift forks 1 and 2
(Fig. 16).
(11) Remove reverse idler gear and shaft (Fig. 17).(12) Remove reverse shift arm and fork (Fig. 18).
MAINSHAFT DISASSEMBLY
(1) On AX 5, measure fifth counter gear thrust
clearance with feeler gauge (Fig. 19). Clearance
should be 0.10-0.30 mm (0.004-0.012 in.).
Fig. 16 Removing Shift Forks And No. 2 Shift Rail
Fig. 17 Removing Reverse Idler Gear And Shaft
Fig. 18 Reverse Shift Arm Removal
Fig. 19 Measuring Counter Fifth Gear Thrust
Clearance
JAX 4/5 MANUAL TRANSMISSION 21 - 9
Page 1572 of 2158
(2) Engage two synchro sleeves to lock mainshaft
gears (Fig. 20).
(3) On AX 4, remove counter gear nut and oil
slinger. On AX 5, remove select fit snap ring that se-
cures fifth spline gear and counter fifth gear on shaft
(Fig. 21).(4) Remove fifth spline gear, synchronizer and
counter fifth gear with 2-, or 3-jaw puller (Fig. 22).
(5) Remove spacer and remove lock ball with pencil
magnet (Fig. 23).
Fig. 20 Locking Mainshaft Gears
Fig. 21 Removing Fifth Gear Snap Ring
Fig. 22 Removing Fifth Gear Assembly
Fig. 23 Spacer And Lock Ball Removal
21 - 10 AX 4/5 MANUAL TRANSMISSIONJ
Page 1573 of 2158
(6) Remove reverse shift arm bracket (Fig. 24).
(7) Remove rear bearing retainer bolts with appro-
priate size torx bit and remove retainer (Fig. 25).(8) Remove rear bearing snap ring (Fig. 26).
(9) Tap intermediate plate with plastic mallet and
pull output shaft-counter gear assemblies out of plate
(Fig. 27).
(10) Remove rear bearing from intermediate plate.
(11) Remove input shaft and shaft roller bearings
from output shaft.
Fig. 24 Removing Reverse Shift Arm Bracket
Fig. 25 Removing Rear Bearing Retainer
Fig. 26 Removing Rear Bearing Snap Ring
Fig. 27 Removing Counter Gear And Output Shaft
JAX 4/5 MANUAL TRANSMISSION 21 - 11
Page 1574 of 2158
(12) Measure thrust clearance of output shaft
gears (Fig. 28). Clearance should be 0.10 - 0.25 mm
(0.004 - 0.010 in.).
(13) Remove output shaft fifth gear snap ring with
two screwdrivers (Fig. 29).(14) Press fifth gear, rear bearing, first gear and
inner race off output shaft (Fig. 30).
(15) Remove needle roller bearing.
(16) Remove synchronizer ring.
(17) Remove synchronizer lock ball with pencil
magnet (Fig. 31).
Fig. 28 Checking Output Shaft Gear Thrust
Clearance
Fig. 29 Removing Fifth Gear Snap Ring
Fig. 30 Removing Fifth Gear And First Gear Bearing
And Race
Fig. 31 Synchronizer Lock Ball Removal
21 - 12 AX 4/5 MANUAL TRANSMISSIONJ
Page 1575 of 2158

(18) Press 1-2 synchronizer and second gear off
output shaft (Fig. 32).
(19) Remove needle roller bearing from the shaft
or second gear.
(20) Remove 3-4 synchronizer snap ring (Fig. 33).
(21) Press 3-4 synchronizer and third gear off shaft
(Fig. 34).
(22) Remove needle roller bearing from shaft or
gear.
CLEANING AND INSPECTION
Clean the transmission components in solvent. Dry
the cases, gears, shift mechanism and shafts with
compressed air.Dry the bearings with clean, dry
shop towels only. Never use compressed air on
the bearings. This could cause severe damage
to the bearing roller and race surfaces.
Inspect the transmission case. Replace the case if
cracked, porous, or if any of the bearing and gear
bores are damaged.
Check thickness of the output shaft and inner bearing
race flanges with a micrometer or vernier calipers (Fig. 35).
²Minimum thickness for shaft flange is 4.8 mm
(0.189 in.)
²Minimum thickness for bearing race flange is 3.99
mm (0.157 in.)
Measure diameter of the output shaft journal sur-
faces with a micrometer (Fig. 36). Replace the shaft
if either of these surfaces are worn beyond specified
limits.
²Second gear surface minimum diameter is 37.96
mm (1.495 in.)
²Third gear surface minimum diameter is 34.98
mm (1.377 in.)
Measure output shaft runout with a dial indicator
(Fig. 37). Runout should not exceed 0.05 mm (0.002
in.).
Install the needle bearing and inner race in the
first gear. Then check oil clearance between the gear
and inner race (Fig. 38). Clearance should be 0.009 -
0.032 mm (0.0004 - 0.0013 in.).
Fig. 32 Second Gear And 1-2 Synchronizer Removal
Fig. 33 Removing 3-4 Synchronizer Snap Ring
Fig. 34 Removing 3-4 Synchronizer And Third Gear
JAX 4/5 MANUAL TRANSMISSION 21 - 13
Page 1576 of 2158
Fig. 35 Checking Shaft And Bearing Race Flange
Thickness
Fig. 36 Checking Shaft And Race Diameters
Fig. 37 Checking Output Shaft Runout
Fig. 38 Checking Gear-To-Race Clearance
21 - 14 AX 4/5 MANUAL TRANSMISSIONJ