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78-42
1977 PONTIAC SERVICE MANUAL
Fig. 78-60 Installing Extension Oil Seal
Fig. 78-61 lnstalling Drive Gear Bearing Retainer Seal
5. Place detent ball on spring and, while holding ball
down, push the shifter shaft into place and turn until the ball
drops into place in detent on the shaft detent plate.
6. Install
"0"
ring seal on shaft.
7. Install shift fork.
NOTE: Do not drive the shifter shaft lock pin into place
until the extension has been installed on the transmission
case.
Reverse ldler Shaft Replacement
1. Place a small punch into hole in extension's reverse
idler shaft boss and drive the welch plug and pin into the shaft
(Fig. 7B-62), until the shaft can be pulled from rear extension.
2. Insert new idler shaft into extension until hole in shaft
lines up with hole in boss.
Fig. 78-62 Removing Reverse ldler Shaft Roll Pin
3. Insert roll pin in boss opening and drive the pin into
the extension until the shaft is securely locked in place. Install
new welch plug, with sealer, in boss opening.
Transmission Case Cover
Although service of the case cover is covered here, the
transmission does not have to be removed to perform these
operations. To remove the cover on-the-vehicle, simply drain
the transmission, disconnect the lst/2nd cross shaft and 3rd/
4th linkage and remove the attaching bolts and case cover
from transmission.
1. Remove the outer shifter lever nuts and lockwasher
and pull levers from shafts.
2. Carefully push the shifter shafts into cover, allowing
the detent balls to fall free, then remove both shifter shafts.
3. Remove interlock sleeve, interlock pin and poppet
spring.
4. Replace necessary parts (Fig. 7B-63) and assembly by
reversing Steps 1-3.
ASSEMBLY OF COUNTERGEAR
1. Install roller spacer in countergear (if removed).
2. Using heavy grease to retain rollers, install spacer,
rollers, spacer, rollers and spacer in either end of countergear.
Repeat in other end of countergear (Fig. 7B-64).
3. Insert a dummy shaft, or Loader J 24658, into
countergear.
CHECKING COUNTERGEAR END PLAY
1. Rest the transmission case on its side, with the case
cover opening toward the assembler. Put countergear tanged
thrust washers in place, retaining them with heavy grease,
making sure the tangs are resting in the notches of the case.
2. Set countergear in place in bottom of transmission
case, making sure that tanged thrust washers are not knocked
out of place.
3. Position the transmission case, resting on its front
face.
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