This is something I could write a book on as hurricane Katrina flooded so many machine here in New Orleans , I found that no two incidents were exactly the same , usually the electrical system fries , it corrides off the wires at the starter , alternator , back of the fuse box and the battery cable , you can try and repair the wiring harness but a new wiring harness is the way to go , how fast the flow of current stops determines how much damage was done , some alternators and starters actually survived and worked but failed not long after from bearing failure , all the relays and the run kill solinoid needed replacement , but the controller and stem coils survived , the display and controll panel on the dash takes on water , as far as the hydraulic system I never seen any problems , the oil usually floats out the tank and is replaced with water so the system needs to be flushed and after you get it running reflushed a couple more times , the engine is no doubt frozen up by now as the water that got into cylinders evaporated and rusted the pistons to the wall , time is of the essence with water , the quicker you get it going the better off you are , the turbo is probally frozen up at the bearings and the valves are probally stuck in a couple of cylinders ,on a good note the bearings of the crank and connecting rods are probally still ok as the water is probally still in the oil pan with the oil floating on top , no air got to the bearings so they will probally still be good , a motor rebuild is probally in it's future , the fuel system such as the injector pump and injectors are ok as they are sealed ,the fuel tank will need to be drained , as mentioned the chain case is a problem as the water is also in the axle tubes and impossible to get out with out total disassembling and I seen quite a few axle bearings fail afterwards , the drive belt usually rustes to the pulley and will need to be replaced , to do it right I'd guess if you did the work yourself you would be around $5,000 of parts and 80 hours of work , give or take , after the storm the dealer was getting about $10,000 to redo a machine , like I mentioned no two incidents are exactly the same , I think I'd bid low ad if I got it use it for parts