Lots of good information in;
On-Highway Trucks sub titled Power Trains and Suspension Systems by Robert N. Brady, published by Reston Publishing
Library of Congress Catologing in Publication Data
TL260.B7 629.2'4 81-15727
ISBN 0-8359-5232-4 AAACR2
Whatever all those numbers mean, and;
Motor Truck Engineering by James William Fitch, James W. Fitch, Publisher 99 South Van Ness Avenue, SF,CA 94301
The editions I have are a little dated by now, with respect to some of the hardware, but the basics are there, as well.
Hope you find them, and find what you need.
rmw