NEW PRODUCT ANNOUNCEMENT HYDRA-MATIC 4L60-E

SUBJECT NEW PRODUCT ANNOUNCEMENT HYDRA-MATIC 4L60-E

MODELS/YEARS 1993 BRAVADA

This bulletin covers the HYDRA-MATIC 4L60-E Service Replace transmission Assembly (SRTA) Program and limited on-vehicle repair guidelines. SRTA models and service parts can be ordered from your local General Motors Service Parts Operations (GMSPO) Parts Distribution Center.

The HYDRA-MATIC 4L60-E is a new transmission model that has electronic shift controls to control shift points.

SRTA ADVANTAGES

A SRTA is the product of a highly successful, customer satisfaction driven program that parallels the existing HYDRA-MATIC 3T40, HYDRA-MATIC 4T60 and HYDRA-MATIC 4L60 programs.

GMSPO Parts Distribution Centers are committed to 48 hour maximum delivery time for all SRTA models, with no VIP charges.

GENERAL GUIDELINES

o On-Car Service or SRTA?

All service parts will be available so that bench repairs can be performed January 1, 1993 (providing the technician has taken the HYDRA-MATIC 4L60-E one-day training class number 17001.18). Until then, limited on-car repairs or SRTA will be the only service options available.

o Transmission conditions considered for SRTA usage:

All repairs that cannot be corrected by replacement of the parts are shown in Figure 1.

o Dealer HYDRA-MATIC 4L60-E transmission repairs include:

Limited on-vehicle serviceable items. Reference Figure 1.

Parts needed to perform limited on-vehicle service on a HYDRA-MATIC 4L60-E transmission are available through your local Parts Distribution Center (PDC).

Important: Do not attempt repairs on a HYDRA-MATIC 4L60-E, uniess the part is shown in Figure I and listed in the repair parts list in this bulletin. All returned HYDRA-MATIC 4L60-E transmissions will be disassembled and inspected in an effort to increase product integrity. Attempting repairs could destroy root cause analysis data.

o Cooler Flushing

Cooler flushing and a flow check MUST be performed whenever a transmission is removed for service. it is essential to flush the cooler after SRTA installation, major overhaul, in the case of pump or torque converter replacement, or when fluid contamination is suspected. Use Kent-Moore tool J35944 and solvent J35944-20 to flush the cooler. Instructions are published in each service manual On-vehicle Service Section.

PARTS INFORMATION:

SRTA PIN Model -------- ----- 8685968 3TAD

1. Write down customer complaint.

2. Check fluid level and condition:

a. Burned? Remember brown color of the fluid may be OK. Refer to Service Manual.

b. Low or overfilled? Correct as necessary.

3. Use the TECH 1 to check for stored Diagnostic Trouble Codes (DTC).

a. Remember, code 12 tells you that the diagnostic function of PCM is functioning correctly. b. If there is a stored transmission code other than code 12, refer to Section 7A-14C of the 1993 Service Manual for diagnostic procedures.

4. Clear codes, test drive car. Monitor powertrain with a TECH 1. For shift points refer to the shift speed chart, Figure 2. Remember when the gear selector is in D2 this will cause a 2nd gear start.

5. Recheck for stored codes. Correct all codes before continuing.

6. If transmission operates properly--stop.

7. For a harsh or soft shift condition confirm correct PROM, then perform transmission line pressure check procedure, Figure 3. if line pressure is too high or too low, replace the transmission.

8. For a poor performance condition verify engine performance, then refer to torque converter evaluation in Section 7A-14A of the 1993 Service Manual.

9. For a vibration or noise condition refer to torque converter vibration test procedure in Section 7A-14A of the 1993 Service Manual.

10. If all the steps check out okay and the transmission still does not function correctly, refer to Section 7A-14A of the 1993 Service Manual and Service Manual Update Bulletin 93-U-06 for diagnostic information. If the diagnostic information determines that an internal component of the transmission needs to be serviced, then replace the transmission. Do not disassemble the transmission.

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.