4wd w/manual locking hubs goes into partial 2wd.now frnt locks up on 1996 Mazda B3000

recently it locked up the front wheels, & i could only move fwd by locking hubs & going into 4wd. while this is happening the rear wheels spin trying to move forward.it goes backwards w/o a problem, even if frnt is locked. lots of noise under truck

by in South Sutton, NH on October 14, 2013
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2 answers 2 comments
ANSWER by , October 14, 2013
What locked the front wheels if hubs were unlocked? don't understand your question. Bad front differential?
COMMENT by , October 14, 2013
don't know what caused the front wheels to lock up (freeze up} . if the hubs were unlocked it shouldn't have frozen the wheels. could this be bad hubs or a bad differential?
COMMENT by , October 14, 2013
Yes if bearings are bad, jack it up put transfer case in neutral, see if front driveshaft turns freely, (unlock your hubs first) then make sure your wheels turn freely. Probably one or the other.
ANSWER by , October 14, 2013
In reverse it is ok: then remove both the locking hubs and drive it, just the part with the lock actuator! Post results.