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78-1 6
1977 PONTIAC SERVICE MANUAL
Hydraulic lock at rear
Replace with notched rail
of lower shift rail.
Synchronizer break away
Replace synchronizer springs
load too high.
Ball on rail selector
Replace rail selector end
too large.
Rail selector installed
Re-install correctly
backwards.
Gear Clash and Binding
Improper linkage
adjustment.
Adjust shift linkage
Lost Motion
Loose or worn swivels and
Replace defective parts
grommets.
Deflection of Mounting
Brackets.
Loose shift levers.
Damaged Cordon Shaft
Jumps out of gear
(5-Speed 77mm Trans.)
Boot improperly installed
on shift handle.
Weak poppet spring
Shift fork pads worn
Synchronizer hub loose
on shaft.
Too much input gear
end play.
Clutch teeth on speed
gear or synchronizer
sleeve damaged.
Clutch housing out of
alignment.
Push boot down to proper
position.
Replace
Replace pads and shift fork
Replace as necessary
Install proper thrust plates
& needle on input & output shafts.
Replace as necessary
Align as necessary
MAINTENANCE AND ADJUSTMENTS
CHECKING TRANSMISSION MOUNTS
Raise the car on a hoist. Push up and pull down on the
transmission tailshaft while observing the transmission
mount. If the rubber separates from the metal plate of the
mount or if the tailshaft moves up but not down (mount
bottomed out), replace the mount. If there is relative
movement between a metal plate of the mount and its
attaching point, tighten the screws or nuts attaching the
mount to the transmission or crossmember.
LINKAGE ADJUSTMENT
Column Mounted Shift-A & X Series (Fig. 78-10)
1. Place column shift lever in the "Reverse" position and
ignition switch in the "LOCK" position.
2. Raise vehicle on hoist.
3. Loosen shift control rod swivel lock nuts. Pull down
slightly on Ist/Reverse control rod attached to column lever
to remove any slack in column mechanism and then tighten
lock nut at transmission lever.
4. Unlock ignition switch and shift column lever to the
"Neutral"
position. Position column lower levers in
"Neutral" position, align gage holes in levers and insert 3/16"
gage pin.
NOTE: Alignment holes are on the lower side of the
levers.
5. Support rod and swivel to prevent movement of the
assembly and tighten 2nd/3rd shift control rod lock nut.
6. Remove alignment tool from column lower levers and
check shift operation. Then place the column shift lever in
"Reverse" and check the interlock control.
NOTE: With shift lever in "Reverse" the ignition key
must move freely to "Lock" position. It must not be
possible to obtain "Lock" position in "Neutral" or any
other gears than "Reverse".
7. Lower and remove vehicle from hoist.
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