2004 Ford F-150 rattling

I just changed my front struts and in the process I had to disconnect my tie rod and upper control arm to get the shock/coil assembly out. Now after putting it back together I drove the truck and immediatly noticed a rattling noise coming from aroud the front passenger side wheel. It only does it in 2wd, going forward, and pressing the accelerator. If I let off the gas or put it in 4wd or reverse there is no noise. The noise increases with speed and if I slam on the brake and keep my foot on the gas it gets louder and finally grinds a little and quits. It sounds to me like its tryin to engage in 4wd for some reason. The only explanation I can come up with is something caused by the spindle pulling against the drive axle when I had the upper control arm off of the steering knuckle. Im no mechanic though so I wanted to hear what u guys think it could be. Thanks for the help.