GMC 1990 Light Truck Repair Manual page 3

This manual includes procedures involved in disassembly and assembly of components
listed in the "Table of Contents."
This manual should be kept in a handy place for ready reference. If properly used, it will
meet the needs of technicians and vehicle owners.
These vehicles contain some parts dimensioned in the metric system as well as in the
customary system. Some fasteners are metric and are very close in dimension to familiar
customary fasteners in the inch system. It is important to note that, during any vehicle
maintenance procedures, replacement fasteners must have the same measurements and
strength as those removed, whether metric or customary. (Numbers on the heads of metric
bolts and on surfaces of metric nuts indicate their strength. Customary bolts use radial
lines for this purpose, while most customary nuts do not have strength markings.) Mis­
matched or incorrect fasteners can result in vehicle damage or malfunction, or possibly
personal injury. Therefore, fasteners removed from the vehicle should be saved for re-use
in the same location whenever possible. Where the fasteners are not satisfactory for re­
use, care should be taken to select a replacement that matches the original. For informa­
tion and assistance, see your authorized dealer.
No part of this publication may be reproduced, stored in any retrieval system or transmit­
ted, in any form or by any means, including but not limited to electronic, mechanical, photo­
copying, recording or otherwide, without the prior written permission of the GMC Truck
Division of General Motors dorp. This includes all text, illustrations, tables and charts.
FOREWORD
CAUTION:
GMC TRUCK OPERATION
TRUCK & BUS GROUP
General Motors Corporation
Pontiac, Michigan