Problem when 4wd hubs are engaged?

I have a 4x4 1988 2.3 five speed Ford Ranger. When I engage the manual locking hubs (but even when truck is still in 2wd) There's a distinct rattle felt when going at higher speeds like over 45 MPH. But it is not present when hubs are not locked, or when going slower. Bad U-joints? Any Ideas?

Are you doing this on dry pavement? If so you shouldn't. I suggest you look online for a owners manual for your vehicle and read the proper use of 4wd.

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