SERVICE REPLACEMENT TRANSMISSION ASSY.(SRTA)

SUBJECT: HYDRA-MATIC 4L80-E/4L80-EHD SERVICE REPLACEMENT TRANSMISSION ASSEMBLY (SRTA)

MODELS: 1991 C/K, R/V, P TRUCKS AND G-VANS WITH 4L80-E AND 4L80-EHD (MT1) AUTOMATIC TRANSMISSIONS

BULLETIN COVERS:

The HYDRA-MATIC 4L80-E/4L80-EHD Service Replacement Transmission Assembly (SRTA) pro- gram began on September 1, 1990. SRTA models can be ordered for all 1991 HYDRA-MATIC 4L80-E/4L80-EHD model applications from your local General Motors Service Parts Operation (GMSPO) Parts Distribution Center.

The HYDRA-MATIC 4L80-E/4L80-EHD program is customer satisfaction driven and parallels the existing SRTA programs. Unit replacement through SRTA represents an additional method of service which GMC Truck dealers can offer the customer in instances where major overhaul is necessary. Addi- tional program details are provided as follows:

SRTA ADVANTAGES:

A SRTA is the product of a highly successful, customer satisfaction driven program providing the technician with a service alternative when address- ing diagnostic and overhaul concerns.

All SRTA units are designed and remanufactured to current engineering specifications and are often less costly than a major overhaul. GMSPO Parts Distribution Centers are committed to 48-hour maximum delivery time for all SRTA models, with no VIP charges.

TRANSMISSION FLUID COOLER FLUSHING: -------------------------- ! Important

Flushing transmission fluid cooler and lines MUST be performed whenever a transmission is removed for service. It is essential to flush the cooler and lines prior to transmission installation or major overhaul, if fluid contamination is suspected, or in any case of pump or torque converter replacement. A cooler flushing tool, Kent-Moore number J 35944, has been sent to your dealership to properly flush the cooler. Time allowance to use the cooler flushing tool is 0.6 hours. This allowance is included in operation number K7000 (Transmission Assembly Replace).

SRTA PROCESSING PROCEDURES: Each SRTA unit will be shipped in a container which must be used for core return of the original 4L80-E/4L80-EHD assembly to your GMSPO Parts Distribution Center. A SRTA information Packet is included with each SRTA unit. The contents of this envelope are to be removed and used as described with each illustration on the following pages (see Figure 1).

SRTA PROCESSING PROCEDURES INFORMATION PACKET- The contents of this envelope include Limited Warranty information, Dealer Product Feedback Form, Core Exchange Return Procedure, and a pre-addressed return mailing envelope. A dealer representative is to explain all warranty information contained in this envelope to the customer (see Figure 2).

SRTA PROCESSING PROCEDURES CORE EXCHANGERETURN: The core return procedure provides detailed instructions for the GMC Truck dealer on handling of the SRTA and original 4L80-E/4L80-EHD units. This sheet can be discarded after use (see Figure 3). SRTA PROCESSING

PROCEDURES - FAILURE ANALYSIS INFORMATION: This Product Feedback Form is to be completed by the service manager and/or technician. Fill out this form as completely as possible to provide information which can be used for analysis. This valuable input can result in future product refinement through corrective action. Insert the white copy of the completed form and a copy of the repair order into the SRTA Information Packet envelope, reseal the envelope and wire tag it to the bell housing of the unit being returned for core exchange. Return the yellow copy of the completed Product Feed- back Form, using the postpaid envelope, to Hydra-Matic Division see (Figure 4.)

4L80-E/4L80-EHD TRANSMISSION IDENTIFICATION INFORMATION: ---------------------------- The 4L80-E/4L80-EHD transmission identification information and the "SRTA MODEL REPLACEMENT CHART" will assist in selecting the correct SRTA unit to order from your local Parts Distribu- tion Center (see Figure 5).

SRTA MODEL REPLACEMENT CHART SRTA Model Part Number Description 4.3L AND 5.7L APPLICATIONS: 1ABP 8679910 4.3L V6 LB4 - C and P-Truck 1ACP 8679911 4.3L V6 LB4 - K-Truck 4WD 1BAP 8679913 5.7L V8 L05 - C, R, G,and P-Truck 1BBP 8679914 5.7L V8 L05 - G-Van Slip Yoke 1BJP 8679915 5.7L V8 L05 - K and V 4WD 1BMP 8679916 5.7L V8 L05 - P-Truck 12-15K w/JF9 1BNP 8679917 5.7L V L05 - C-Truck 12-15K w/JF9 DIESEL APPLICATIONS: 1CAP 8679918 6.2L V8 LL4 - C, R, G and P-Truck 1CBP 8679919 6.2L V8 LL4 - C-Truck Slip Yoke 1CKP 8679921 6.2L V8 LL4 - K and V-Truck 10K 4WD 1CRP 8681954 6.2L V8 LL4 - P-Truck 12-15K w/JF9 7.4L APPLICATIONS: 1DBP 8679922 7.4L V8 L19 - G-Van 3.42-3.73 Axle 1DCP 8679923 7.4L V8 L19 - C, G, R 4.10-4.56 Axle 1DDP 8679924 7.4L V8 L19 - G 4.10-4.56 Slip Yoke 1DFP 8679925 7.4L V8 Ll9 - P-Truck 1DKP 8679926 7.4L V8 Ll - K and V-Truck 4WD 3.42-3.73 1DLP 8679927 7.4L V8 L19 - K and V-Truck 4WD 4.10-4.56 1DNP 8679928 7.4L V8 Ll9 - P-Truck 12-15Kw/JF9 1DPP 8679929 7.4L V8 Ll9 - P-Truck 15-16.5K w/JFg 1DRP 8679930 7.4L V8 L19 - C-Truck 12-15K w/JF9 1DSP 8680903 7.4L V8 L19 - C-Truck 5.6K 4.10 Axle

Parts are currently available from GMSPO.

NOTE: Part numbers are accurate at time of printing and subject to change. Refer to the latest GMSPO Parts Catalog for part numbers of SRTA models listed.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.