Originally posted by bpc:
Changing the differential fluids more often is also recommended if you go through high water a lot
Or intall breathers on your diffs if they aren't already on your truck.
It might cost you $20 in tubing and the breather nipple for the diff. It's extremly easy to do, and it's peace of mind if you are forced to go through deeper water.
This is the one on the rear diff:
If you have an Automatic, you should do the breather for the tranny as well.