The LD, LDS, and LDT engines, built by Hercules, Continental found in 2 /12
and 5 ton trucks have a 478 cubic inch displacement, EXCEPT the LDS427, which
is 427 CID.
The front axle engages under a couple of different circumstances on a G744
series 5 ton: shifting into first or reverse.
On G-742 deuce the front wheels engage when rears slip, except those M34
REO's serial # 90484 and below, which also engage front axle automatically
when in reverse.
hope this helps,
David
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