- Lip seals on the drum ends need to be fitted (housings need to suit)
- Motors have a breather hole, it needs to be sealed and a breather tapped in and run to a higher point (like diff breathers do)
Just to name a couple of small things...
Control solenoids if solid state are usually ok, but old style need cleaning and upkeep if dunked in mud etc..
With most good quality winches:
Usually a quick swim isnt a problem, but plan to service the winch yearly.
Extended swimming (lots of water / mud play) plan to run winch each trip to dry it out and then re-spool.
Plan to service regularly submerged winches more often.

