I'm not sure when you feel the "clunk", but its possible its taking longer
than you expect to engage. One note, on the NV transfer cases, maintaining
proper fluid level is essential, as it has its own oil pump. Too little
fluid, and operation can be sluggish or stuck in 2wd.
I'm also not sure why it feels like its hydroplaning. In 4wd, you should be
able to feel the front end grip, at least some of the time. If it were
actually hydroplaning (As Tbone suggests) you would be out of control and
4wd would be useless. If it is indeed hydroplaning, the likely cause is
something other than the 4wd operation, such as tires, road conditions or
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