Firenza L4-121 2.0L VIN K TBI (1987)
Shifter M/T: Technical Service Bulletins
M/T - Shift Lever Rattle/Buzz Noise In 3rd or 4th Gears
SUBJECT:
SHIFT LEVER RATTLE/BUZZ NOISE IN 3RD OR 4TH GEARS ISUZU 5 SPEED M/T (NEW PARTS)
MODELS/YEARS:
1985-88 FIRENZA and 1985-89 CUTLASS CALAIS
MODELS EQUIPPED WITH ISUZU 5-SPEED MANUAL TRANSAXLE (RPO - MK7 AND MT2)
NUMBER:
89-T-44
CORP. REF. NO: 937201
DATE:
February 1989
SECTION:
7B
This bulletin supersedes Dealer Technical Bulletin 86-T-47, date 8/8/86 which may be destroyed.
Engine VIN "O" pertains to 1.8L; Engine VINs "U" and "R" pertain to 2.5L; and the other VIN numbers pertain to 2.0L engines.
Some 1985-88 Firenza and 1985-89 Cutlass Calais models equipped with Isuzu 5-Speed manual transaxles may exhibit a rattle or buzzing type noise
through the shifter handle while driving in 3rd or 4th gears. This noise condition is normally caused by a run-out condition between the 3-4 synchronizer
and the 3rd or 4th input gears.
This condition has been corrected during the 1989 model year. Therefore any 1989 vehicle equipped with an Isuzu unit built on or after serial number
IX17J01 should not have this condition. The serial number is printed on the transmission bar code label, which is located on the clutch housing. The
serial number should be read as follows:
Positions
1 Corp. Name (i.e. I = Isuzu)
2 Month of build 1-9, X, Y, or Z (i.e. 2 = Feb., 7 = July, X = Oct., Z = Dec.) 3,4 Day of month built 1-31 (i.e. 17 = 17th day of the month) 5
Year of build (i.e. J-Z = 1988, A-1 = 1989)
Examples:
Unit IX17J01 = built on Oct. 17, 1988. Unit I130B35 = built on Jan. 30, 1989.
To repair this condition install a new 3rd/4th synchronizer assembly, 3rd/4th fork assembly, and a 3rd or 4th input gear. Refer to the following chart
when ordering parts from GMSPO.
ENGINE
MODEL
PART
DESCRIPTION
BODY
VIN
YEAR
NUMBER
Fork - 3rd/4th
J/N
All
All
94464752
Synchronizer Asm.
J/N
All
All
94249573
-
3rd/4th
3rd Input Gear
J
1
1988
94149668
J
P,1
1985-87
94139574
J
K,O
1985-88
94149668
N
U
1985-89
94149668
4th Input Gear
J
1
1988
94139575
J
P,1
1985-87
94139576
J
K,O
1985-88
94139575
N
U
1985-89
94139575
Parts are currently available from GMSPO.
Use applicable Labor Operation Number and Time.
