I have a 2001 F150 supecrew. I have just started hearing a vibration noise along with a vibration in the steering wheel while brakeing. Tonight I was taking my wife to work and put it in 4H because of the snow here in the northeast. I heard a clunk I let off the gas it went away and then I stepped on the gas again and heard the clunk again. I took it out of 4H and had to one wheel it to Atlantic city. Does any one have any ideas on what the problem could be? I have the electronic switch on the dash. I would appreciate any help here. I have about 36,200 miles on the odometer. Randy