Pontiac FIREBIRD 1972 Service Manual page 824

7A-2 1972 PONTIAC SERVICE MANUAL
5. Frozen 3rd speed blocker ring'on main drive gear
cone.
m
3. Weak or broken synchronizer springs.
4. Worn blocker rings and/or cone surfaces.
5. Broken blocker rings.
6. Excessive rock of synchronizer assembly on main-
shaft.
6. Burred or battered clutching teeth on synchronizer
sleeve and/or main drive gear.
JUMPING OUT OF GEAR
1. Shift linkage out of adjustment, bent, worn or loose.
2. Lack of lubrication on shift linkage.
3. Transmission misaligned or loose.
4. Shifter lever, shifter shaft and/or shift fork bent or
worn.
5. Worn pilot bearing.
6. End play in main drive gear (bearing retainer loose
or broken, loose or worn bearings on main drive gear
and main shafts).
7. Detent cam spring weak or detent cam notches worn.
8. Worn clutch teeth on respective speed gear and/or
worn clutch teeth on synchronizer sleeve.
9. Worn or damaged synchronizer assembly.
10. Bent main shaft.
FORWARD GEARS CLASH
1. Excessive engine idle speed.
2. Clutch not fully releasing.
REVERSE GEAR CLASHES
Allow approximately three seconds after depressing
clutch pedal before shifting into reverse gear. If gear clash
is still present:
a. Check clutch adjustments.
b. Check for dragging or distorted clutch driven
plate.
c. Check for tight or frozen main drive gear bearing.
LEAKS LUBRICANT
1. Excessive lubricant.
2. Main drive gear bearing retainer loose or cracked, oil
seal or gasket damaged.
3. Worn or damaged rear extension oil seal.
4. Worn or damaged shifter shaft seals.
5. Rear extension-to-case gasket damaged.
6. Case cover or gasket damaged.
GENERAL DESCRIPTION
This transmission incorporates helical drive gears
throughout with all forward gears synchronized, these
gear changes being accomplished with synchronizer
sleeves. The synchronizers permit quicker shifts, greatly
reduced gear clash and permit downshifting from third to
second between 40-20 mph and from second to first below
20 mph.
The Saginaw three speed transmission is used as the stand-
ard equipment transmission on all A, F and X Series
equipped with 250 cu. in., 1 Bbl., 307 cu. in., 2 Bbl. (X
Series Only) and 350 cu. in., 2 Bbl. engines (A and F Series
only).
Fig. 7A-1 Gear Train
-
Neutral