Pontiac TRANS AM 1977 Service Manual page 1183

78.1 4
1977 PONTIAC SERVICE MANUAL
d. Worn countergear
bearings
e. Idle speed too low
d. Replace countergear
bearings and shaft
e. Adjust idle speed
Noisy in All
Reduction Gears
a. Insufficient lubricant a. Fill to correct level
b. Worn or damaged main
b. Replace faulty or damaged
drive gear or countergear gears
Noisy in First Only a. Damaged first speed a. Replace damaged gears
(5-Speed 77mm Trans.) or countergear
b. Needle bearing rubbing b. Replace as necessary
first speed gear
Noisy in Second Only a. Damaged or worn a. Replace damaged gears
second-speed constant
mesh gears
b. Worn or damaged
b. Replace countergear
countergear rear bearings
bearings and shaft
c. Damaged or worn second- c. Replace synchronizer
speed synchronizer
Noisy in Third Only a. Damaged or worn third- a. Replace damaged gears
speed constant mesh gears
b. Worn or damaged b. Replace damaged counter-
countergear bearings gear bearings and shaft
c. Damaged damper gear c. Replace damper gear
(5-Speed 77mm Trans.)
Noisy in Reverse Only a. Worn or damaged reverse a. Replace reverse idler
idler gear or idler bushing gear assembly
b. Worn or damaged reverse b. Replace reverse gear
gear on mainshaft
c. Damaged or worn reverse c. Replace countergear
countergear assembly
d. Damaged shift mechanism d. Inspect linkage and adjust
or replace damaged parts
High Pitched Whine* a. Damaged needle thrust a. Replace as necessary
(5-Speed 77mm Trans.) bearing
*Usually noticeable in all forward gears under drive condition-not noticeable under coast load.
Excessive Backlash in a. Worn countergear a. Replace bearings
all Reduction Gears bearings
b. Excessive end play in b. Replace countergear thrust
countergear washers
Main Drive Gear Bearing
Retainer Burned or
Scored by Input Shaft
a. Loose or damaged a. Replace bearing.
See
mainshaft pilot bearing Section 6 for bearing fit
b. Misalignment of b. Align transmission
transmission
Leaks Lubricant a. Excessive amount of a. Drain to correct level
lubricant in transmission
b. Loose or broken main b. Tighten or replace retainer
drive gear bearing
retainer