Ford: 4x4 transfer case and front drive shaft, ford f150 4x4, bicycle rim

Question
My truck is a 1994 Ford F150 4x4 4.9L standard shift . I recently had a big snow storm and used my front axle. My truck drove very well in the snow in 4 wheel drive. My problem is that now whenever I engage the front axle she squeeks like and old bicycle rim and shakes as speed progresses. I raised the truck off its wheels and ran it in gear in 4wheel without the front axle locked the front drive shaft spun with a slight wobble but no squeeks. I repeated this again with the front axle locked in 4wheel and she started back squeeking and shaking with added speed.I've
replaced the transfer case fluid with fresh Mercon to no avail. The shaking never stopped but the squeeking did temporarily when I sprayed the front drive shaft yoke and u-joint with WD-40..
Could the front drive shaft be out of balance?, or could the front drive shaft yoke be bent? Could this particular u-joint need replacing? Any suggestions will be much welcomed..  Thanks


Answer
Nate  just sounds like you need to replace the u-joints also ck the ones in the axles and the bearings . these front drive shafts take a lot to bend them. and they will have a slite wobble.now if your front axles are a seal unit ck the wheel bearings and make sure there ok if they are just repack them  and to do this you must remove the front hub assy.