My H3 Water Story in the thread below:
In short, I had my rear diff, and the whole backend of my truck under water for over 30 minutes, much longer than you. My damage was water seeped into the gas tank solenoid valve, located on top of the tank putting it above the 24" fording depth for the H3. The water contaminated my system so I staled out and was deadlined. The oil weight in the diffs are very heavy and are designed to keep out water, I had the dealer check during my repairs and reported them to be in good condition.
I think if you had water in your truck you'd know. If you've already pushed a tank of fuel through it, I'd say that's not your problem. Go ahead and run a cleaner through it just in case.
Did you check your air filter after battle.. was is moist/damp?
http://www.elcovaforums.com/forums/s...ad.php?t=27492
