Tools - A/T Speed Sensor Removal and Installation

90chevy03

Number: 90-122-7A

Section: 7A

Date: December 1989

Corporate Bulletin No.: 977160

Subject: PLASTIC SPEED SENSORS AND NEW TOOL TO REMOVE AND INSTALL


Model and Year: 1990 LIGHT DUTY TRUCKS WITH 4L60 (700-R4) AUTOMATIC TRANSMISSION

. Figure 1 - Transmission Identification Information:

TO: ALL CHEVROLET DEALERS

This bulletin covers usage of an all plastic internal transmission speed sensor which has been increased to include twenty-three models of the HYDRA-MATIC 4L60 transmission. All 1990 General Motors light duty trucks and vans will use the Rear-Wheel Anti-Lock Brake System which requires the use of the internal transmission speed sensor.

Beginning Start Of Production 1990, some of the following models of the HYDRA-MATIC 4L60 were built with the plastic internal transmission speed sensor: (See Figure 1.)

OCAM, OCBM, OCCM, OCFM, OCHM, OCJM, OCKM, 0CLM, OLAM, OLBM, OLCM, OLDM, OMBM, OMJM, OMSM, ORAM, ORBM, OSAM, OSHM, OWAM, OWBM, OWCM, OWDM

The remaining models are scheduled to receive the plastic internal transmission speed sensor during the 1990 model year.

Figure 2 - Plastic Speed Sensor And Removal/Installation Tool:

A new available tool has been developed for the plastic internal transmission speed sensor. This tool is necessary to prevent damage to the speed sensor during its removal. The tool is available through Kent-Moore as J-38417 - Speed Sensor Remover and Installer.

Part Number Description

8673299 Speed Sensor - Internal Transmission

Parts are currently available from GMSPO.

Information on speed sensor removal and installation is included in the Unit Repair Section of the 1990 Service Manual.