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MANUAL TRANSMISSIONS
7B-27
UNIT REPAIR
3-SPEED 76MM LT. DUTY MUNCIE TRANSMISSION
INDEX
Removal of Transmission
.................................................................................
7B-27
Disassembly of Transmission
..........................................................................
7B-27
Disassembly of Mainshaft
................................................................................
7B-27
Cleaning and Inspection
...................................................................................
7B-28
Transmission Case
.......................................................................................
7B-28
Front and Rear Bearings
..............................................................................
7B-28
Bearing Rollers
..............................................................................................
7B-28
Gears
............................................................................................................
7B-28
Reverse Idler Gear Bushing
.........................................................................
7B-28
Countergear Anti-Lash Plate
......................................................................
7B-29
Repairs
..........................................................................................................
7B-29
Clutch Keys and Spring
...............................................................................
7B-29
Extension Oil Seal or Bushing
.....................................................................
7B-29
Clutch Bearing Retainer Oil Seal
................................................................
7B-29
Assembly of Mainshaft
.....................................................................................
7B-30
Assembly of Transmission
...............................................................................
7B-30
Installation of Transmission
..........................................................................
7B-3 1
REMOVAL OF TRANSMISSION
Before raising vehicle, disconnect battery and release
parking brake.
1. Raise vehicle on hoist and drain lubricant from
transmission.
2. Scribe a mark on companion flange yoke and propeller
shaft yoke to assure proper reassembly and remove propeller
shaft.
3. Disconnect speedometer cable and TCShack-up light
connector.
4. On column shift controlled vehicles, disconnect
transmission shifter levers from transmission shifter shafts
(Fig. 7B- 10).
On floor shift controlled vehicles, in addition it will be
necessary to remove shifter assembly-to-shifter support bolts
and remove shifter assembly from transmission (Fig. 7B-11).
If shifter assembly replacement is not required, it may be left
hanging from its floor seal while transmission is being
removed.
5. Remove crossmember-to-transmission mount bolts,
catalytic converter-to-transmission bracket and remove
crossmember-to-frame bolts.
6. Raise transmission to take weight off support and
remove crossmember from vehicle.
7. Remove upper transmission-to-clutch housing bolts
and install aligning Guide Pins J 1126 (or 1/2"-13
x
2"
threaded headless bolts).
NOTE: Aligning guide pins or studs must be used to
support transmission in order to prevent distortion of the
clutch driven plate hub while removing transmission.
8. Slide transmission straight back on guide pins until
main drive gear splines are free of clutch driven plate and
remove from vehicle.
DISASSEMBLY OF TRANSMISSION
1. Remove case cover attaching screws and remove case
cover assembly and shift forks.
2. Remove drive gear bearing retainer and gasket.
3. Remove drive gear bearing to gear stem snap ring,
then remove drive gear bearing by pulling outward on gear
until a screw driver of other suitable tool can be inserted
between bearing large snap ring and case to complete removal
(Fig. 7B-24). The drive gear bearing is a slip fit on the gear
and into the case bore (this provides clearance for removal
of drive gear and mainshaft assembly).
4. Remove speedometer driven gear from extension.
5. Remove extension to case attaching bolts.
6. Remove the reverse idler shaft
"E"
ring.
7. Remove drive gear, mainshaft and extension assembly
together through the rear case opening. Remove clutch drive
gear, needle bearings (14) and synchronizer ring from
mainshaft assembly.
8.
Using snap ring pliers, expand the snap ring in the
extension, which retains the mainshaft rear bearing (Fig. 7B-
25), and remove the extension.
9. Using J 22246 at the front of the countershaft, drive
the shaft and its woodruff key out the rear of the case. Tool
J 22246 will now hold the roller bearings in position within
the countergear bore. Remove the gear, bearings and thrust
washers from case.
10. Remove loading tool, bearings and spacers from
countergear.
1 1. Use a long drift or punch through the front bearing
case bore and drive the reverse idler shaft and woodruff key
through the rear of the case (Fig. 7B-26).
DISASSEMBLY OF MAINSHAFT
(Fig. 7B-27)
1. Using snap ring pliers, remove the 2nd and 3rd speed
sliding clutch hub snap ring from mainshaft and remove
clutch assembly, 2nd speed blocker ring and 2nd speed gear
from front of mainshaft.
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