C 3500 Truck 2WD V8-454 7.4L (1990)
Transmission Speed Sensor: Technical Service Bulletins
Tools - A/T Speed Sensor Removal and Installation
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.
