Here is a direct download of the pdf file TM9-8031-2_power_train:
(Please note that this file is over 30Mg so it take time to open)

TM 9-8031-2
POWER TRAIN
BODY AND FRAME
FOR
3/4-TON 4X4 CARGO TRUCK M37;
COMMAND TRUCK M42;
AMBULANCE TRUCK M43;
AND TELEPHONE MAINTENANCE
TRUCK V41