2000 Ford F-150, Won't shift into 4x4?

Question:
I have this 2000 Ford F-150, it is having trouble engaging the front diff so it can shift into 4x4 properly, if I shift into 4x4 at like 30 mph it grinds if I am moving very slow it doesn't. Its not the transfer case or the front diff, it is a vaccume problem. What are the things that go bad on these? Any advice

Answers:

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On this truck you can engage 4WD high at any speed up to 55 mph. (4 Low is only in neutral)

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By the sound of it, the shifter lever assembly in the front differential that locks the wheels to the axle broke.. Common problem.. see a Ford dealer for more info....

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It uses vaccum to move a little vaccum motor attached to this rod.. check for vaccum at the motor (it has a cover over it) by having someone cycle the 4 wd while watching the motor.. if the rod moves, you have internal problems to front diff.. sorry

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You're not supose to shift into four wheel drive while moving.

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maybe its a 2 by 4 and since it is your first truck you are got little confused while trying to act manly

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shifting to 4 wheel high is ok while driving. the switches on the dash are a constant problem on these trucks. most likely and common problem.

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