Firenza L4-112 1.8L VIN 0 TBI (1982)
Shift Cable: All Technical Service Bulletins
FWD M/T - Hard Shifting/Gear Noise
SUBJECT
SERVICING FRONT-WHEEL DRIVE MANUAL
NUMBER:
84-T-10
FOUR-SPEED TRANSAXLE
DATE:
June 15, 1984
MODELS/YEARS
1980-1984 OMEGA AND FIRENZA
SECTION: 7B
This bulletin will supersede the August 1983 Service Guild article on 4-Speed Manual Transaxle Shift Effort and Gear Noise.
Oldsmobile has offered a four-speed front-wheel-drive manual transaxle on Omega models since 1980, and on Firenza models since 1982. This bulletin
upgrades existing information on these units. Areas covered are: (1) shift effort and shift quality, and (2) gear noise.
1.
SHIFT EFFORT AND SHIFT QUALITY
A.
First check to be sure no assembly aids are left on car.
In car:
5/32" pin - locks shifting lever mechanism in first gear.
"Yoke clip" holds shifter in 1-2 gate; no reverse or 3-4 shift is possible.
Underhood:
Inspect shifter shaft below shift lever to see that no biasing clip (large hairpin) is present.
B.
If car is new, shift feel may be improved by shifting through the gears many times (25-50), which conditions the transaxle.
C.
Next, perform the following adjustment - (two man procedure).
1.
Disconnect battery cable.
2.
From inside car, shift into first gear and hold in position all the way forward and to the left as far as it will go.
3.
Underhood, loosen nuts on selector lever and shift lever.
4.
Underhood, remove lash in select lever (top lever) by pushing it toward driver's side of car (clockwise) and holding it while nut is
tightened. DO NOT USE POWER TOOLS.
5.
Repeat Step 4 for shift lever, removing lash in same manner and tighten nut. Check for equal overshift in first and second gear. If not
equal, readjust until overshift is equal.
6.
Recheck adjustment by shifting transaxle from inside the car while observing motion of both shift levers underhood. Little or no
movement of select lever should be noted on 1-2 or 3-4 shift. If excessive movement of select lever is noted, repeat entire adjustment
procedure (Steps 2-6) before proceeding.
7.
Drive car and evaluate improvement.
BEFORE REMOVING TRANSAXLE, VERIFY SHIFT PROBLEM IS INTERNAL TO GEAR BOX.
1.
Disconnect cables at select and shift levers.
2.
Check shifter and cables for freedom of operation. Repair as necessary.
3.
Manually shift transaxle with select and shift levers to check for ease of operation and verify problem is in transaxle.
With transaxle removed, inspect shift forks for wear. If shift fork is worn or binds, replace BOTH shifter fork and synchronizer.
WHEN REASSEMBLING TRANSAXLE, USE SHIMMING PROCEDURE PROVIDED IN SECTION II, PART D.
II. GEAR NOISE
Resolving a transaxle gear noise or whine complaint begins with good diagnosis to determine if the noise is related:
^
to the transaxle at all.
^
to the noise paths into the passenger compartments.