Calais L4-138 2.3L VIN D FI (1990)
Accumulator: Customer Interest
A/T - Pedal Buzz At Idle or Light Throttle
NUMBER:
91-T-02A
CORP.REF.NO: 077126R
DATE:
March 1991
SECTION:
7A, 3T40
SUBJECT:
PEDAL BUZZ AT IDLE OR LIGHT THROTTLE IN FORWARD GEAR RANGES - NEW SPACER PLATE
MODELS/YEARS:
1990-91 CUTLASS CALAIS AND CUTLASS SUPREME
EQUIPPED WITH QUAD 4 ENGINE AND HYDRA-MATIC 3T40 (RPO-MD9) TRANSAXLE
This bulletin cancels and supercedes Dealer Technical Bulletin 91-T-02.
This bulletin covers a new spacer plate with a smaller 1-2 accumulator orifice which will reduce the potential for pedal buzz. This pedal buzz is
noticeable at zero to light throttle in forward gear ranges caused by unstable operation of the 1-2 accumulator valve.
DATE OF PRODUCTION CHANGE:
This new spacer plate went into production in all "K" and "L" model HYDRA-MATIC 3T40 transaxles for the 1991 model year on July 30, 1990 (Julian
Date 211).
NOTE:
1991 KKC model transaxles with serial numbers built between 1011 - 1830 and built after July 30, 1990 (Julian Date 211) are also
affected.
SERVICE PROCEDURE:
To service any HYDRA-MATIC 3T40 for a pedal buzz condition, replace the (existing) spacer plate with a new spacer plate which contains the smaller
1-2 accumulator orifice.
SERVICE PARTS INFORMATION:
Refer to the following part numbers whenever ordering this new spacer plate.
Part Number and Transaxle Model
8678035 - KDC
8678489 - KKC
8678488 - KNC
8678038 - KXC (1991 Only)
8678163 - LJC
8678164 - LKC
8678164 - LLC
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Whenever service to the Spacer Plate or valve body assembly is necessary, refer to the HYDRA-MATIC 3T40 Unit Repair Section of your service
manual.
