I went through some pretty deep water a couple of days ago and now I am noticing a wierd whine at low speeds. It sounds like its in 4 wheel when its not. Whats up?

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1997 Ford F-250 Heavy Duty 4x4 V-8 460ci. 5-speed. 3.55 limited slip.K&N Filter, Flowmaster Dual exhaust,Big-O 285 75r16' XT,

 

Since that is what it sounds like, try putting a chalk mark or piece of tape or something on your front driveshaft, and see if it turns when you are in 2HI. If so, then need to figure out if a hub is still locked, or X-case still in 4HI.

 

You might want to change your diff fluid. If any water went past the top of the vent tube, you'll have problems by leaving that fluid in the diff.

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'99 Lariat Supercab 4x4 SS
5.4L, 3.73 Diff (9.75" LSD Rear, 8.8" Front)
ORP: Skid Plates, LT265/70R17 GY Wrang. AT/S
Group III towing: HD Electrical/Cooling, GVWR 6500# (Extra leaf spring).
Step Bars
4W Disc anti-lock brakes
K&N filter
Stock Items That Differ Across F150s: Steel Driveshaft, Oil filter bolted to engine w/ drip guard, 4R70W transmission.