What things to check / service after doing a high water crossing?

[Coalsmoke]

We've had record snowfalls so far this year, and today it warmed up and started raining very hard, so, we have flooding happening. One section of road on the way home I went through ended up being somewhere in the 3-4 feet deep range. I wasn't going to open the door and measure it It was coming over the hood and being that it was dark and the headlights weren't doing much good in the water, I was pretty much just 'imagining' where the road was and kept on trucking at about 5mph. I am quite pleased that the truck handled that deep of water so well, but I wish I didn't have to give it that deep of a dip

The engine was luke-warm, not hot, so I'm not too worried about any warping or cracking. When I got home I popped the hood and there was water and bits of debris everywhere, on the batteries and even on top of the valve cover. I pulled the air filter and the bottom of it was wet but the intake tube was still dry. I think having the winter fronts on is a big part of why I didn't end up sucking water.

I plan to change the engine oil, and send off an analysis of the trans, transfer case and both axles for water, might just change them all to be safe. I know that at least some of my electronic modules got wet, including my edge box, but nothing seems to be malfunctioning.

Has anyone taken their trucks through high water? Anything else I should be on the lookout for?

Thanks in advance.