For 1990-2009 cars

# TRANSMISSION FLUID LEAKS AT THE VEHICLE SPEED SENSOR

TRANSMISSION APPLICATIONS: 4L60

#### SUBJECT: TRANSMISSION FLUID LEAKS AT SPEED SENSOR (NEW SPEED SENSORS)

VEHICLE APPLICATIONS: 1990-91 B, D AND F WITH 4L60 TRANSMISSION

#### CONDITION:

---------- Transmission fluid leaks at the vehicle speed sensor.

#### CAUSE:

------- The leak may be at the sensor seal to the transmission or at the electrical connector to the sensor.

#### CORRECTION:

----------- A new series of transmission speed sensors with improved anti-leak characteristics should be used to correct the condition.

Use: P/N 10456087 REPLACES P/N 10456020 P/N 10456088 REPLACES P/N 10456021 P/N 10456089 REPLACES P/N 10456022

Parts are currently available from CANSPO.

Use Labour Code K6310 and Labour Time 0.5h.

See parts book for proper application.

The attached artwork/repair information supplements the unit repair for speed sensor/speedometer driven gear given in section 7 of the service manual.

SPEEDOMETER DRIVEN GEAR AND SPEED SENSOR 700-R4 (HYDRA-MATIC 4L60)

Figure 7A2-24 () Remove or Disconnect

- Raise and suitably support vehicle. Refer to GENERAL INFORMATION (SEC. 0A).

1. Speedometer wire connector from transmission (4).

2. Retainer bolt (5).

3. Speed sensor-driven gear assembly (1, 2, and 3) from case extension.

4. Driven gear from speed sensor (2).

() Install or Connect

1. New driven Gear on speed sensor (2).

2. Speed sensor driven gear assembly into case extension (1, 2, and 3).

3. Retainer bolt (5).

4. Speedometer wire connector (4).

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.