GMC 1989 Light Duty Truck, Руководство по ремонту, Страница: 915 / 998

NEW PROCESS TRANSMISSION 7B3-3
DISASSEMBLY OF THE TRANSMISSION
R em ove or D isco n n ect (Figure 2)
Tool Required:
J 29793 Countershaft Alignment Tool
• Speedometer driven gear, switches and any external
components.
• Shift the transmission into neutral.
1. Reverse shift lever (445).
2. Side cover (450) and the gasket.
• Detent ball and the spring.
• Shift forks (452 and 453). Note the positions
they were removed from.
3. Extension housing screws (439), (figure 3).
• Turn the housing upside down on the main­
shaft.
• Install one screw to hold the housing, as
shown.
Im portant
• Do not damage the countershaft or bearings when
removing the plug and the countershaft.
4. Countershaft plug (432).
• Punch or drill a hole in the center of the plug.
• Reaching through the hole, drive the coun­
tershaft to the rear until the woodruff key can
be removed.
• Drive the countershaft to the front until it
pushes the plug out of the case.
5. Countershaft (429), using J 29793.
• Drive the countershaft out the rear of the case.
6
. Extension housing screw (439).
• Turn the housing to the normal position.
7. Bearing retainer (401) and the gasket.
8
. Main drive gear (405).
• Drive the gear out the front of the case.
9. Extension housing (416) and the mainshaft.
• Slide the 3rd and overdrive synchronizer
sleeve (407) to the front (figure 1).
• Slide the reverse idler gear (422) to the center
of the idler shaft.
• Drive the housing to the rear.
10. Snap ring (454) and the mainshaft (418) from the
extension housing (figure 4).
11. Countergear (430) and the thrust washers.
12. Reverse idler shaft (424).
• Place a
3
/s-inch x
31
/
2
-in screw and nut into a
3
/
8
-inch drive, deep
7
/ i
6
-inch socket.
• Place the screw head against the case and the
socket against the shaft.
• Turn the nut against the socket, driving the
shaft out of the bore (figure 5).
• Remove the shaft, the gaer and the key.
13. Reverse shift shaft (443) and the seal.