From my experience with a bulldozer that was submerged overnight, I would advise scrapping the truck. I disassembled the dozer completely down to the bare main frame and flushed and scrubbed every part before reassembling. Replaced every bearing and seal. Result: had bearing failure after bearing failure for the next several months. Sand can get into cracks and crevises that you cannot find or clean and it will eventually migrate out into the oil and bearings.. Finally put the dozer on the auction block. very expensive lesson.
But if you want to try it here is some info that may help!
ArvinMeritor -- Products & Services -- Car & Light Truck Products -- Door Systems
Dieseldoctor