I have a 99 F-250 super duty 4x4. I had it in 4 wheel drive the other day and then I took it out and at about 60 m.p.h. I hit a bump and the left front started to vibrate and shook the whole truck. I pulled over and at about 5 m.p.h. it stopped till I got up to speed and hit another small dip going over a brigde. And again I slowed down and it stopped. Now it is doing it at about 15 to 20 m.p.h. on flat road and making a bad grinding noise. Any ideas of what I may have wrong?
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Vibration from about 40-60 mph is usually attributed to wheel balancing, but the onset when you hit a bump seems to indicate play in the steering linkages (tie rods etc) or suspension members and stabiliser bar rubbers but you had that all checked out, that brings us back to the wheel balancing.
sounds like you have a bearing going out in the hub. The reason it stops making noise with 4 wheel engaged is having the truck in 4 wheel drives puts power to the front hub. Which gives it more stability. In other words you have power which helps bind and hold the bearings from more extensive travel then with it disengaged. The other possibility is you have a ball joint going out. If you are capable of inspection on these to possibilities you will need to jack it up and inspect ball joints for movement and look for abnormal up and down movement of the hub. If not take your truck in and get the front end inspected at a brake or an alignment shop.
I hate to say it but it sounds like you have a severe problem in the rear end. Here are a couple of things i would do. First pull off your tires and wheels. Of course you need to put the truck on jack stands and block the wheels for safety! Disconnect your rear drive line so you know nothing from front diff or trans could be affecting it. Next spin the brake rotors by hand and inspect them for severe damage. Go forwards and backwards. Also listen in your rear end for grinding or clunking noises and also excessive play front foward to reverse. And last drain your oil and put your finger up inside the housing as far as you can and feel for large pieces that should not be there. This should give you a good idea if it is in your braking sytem your rear end or wether you need to start looking at front diff. or the trans. If all is good on rear end do the same thing for front diff and inspect it as well. Make sure you pull front driveline off!
If it is a 2 wheel drive, it is probably your wheel bearings. If it a four wheel drive, it could be the front differential, the joints on the axle shafts, the locking hubs, or the wheel bearings. On the four wheel drive, crawl under the vehicle and grab the axle shafts and see where the excess movement is. Also try grabbing the tires and see if there is any movement. There shouldn't be any movement while the wheels are on the ground.