Tingling Noise on 99 Ranger XLT 4.0L, 4x4

[B-Rose]

I have a tingling sound coming from either the front passenger side or front driver side and it sounds like it's metal to metal contact. I tighten the nuts to the tortion bar on both sides b/c I found that they were loose (there were two metal washers that were just dancing around before I tighten the nuts, so I figured that was the problem, but it WASN'T). The noise starts around 15 mph and when I'm running 55-60 you can't really hear it (probably b/c I'm moving too fast). I've tried shaking other parts on the front end near the wheels, but I can't seem to find anything loose. The wheel bearings have been replaced on both sides and my mechanic did say to keep an eye on my ball joints b/c the will need to be replaced in the next 6 months or so. So if ANYONE has any ideas on what to try next or what the problem may be, your help is greatly appreciated...Thank You

=>Sorry for Being So Lengthy

[Johnny Mullet]

Exhaust heat shield loose maybe? That is a common thing to rattle when the little welds on the shields break.

[B-Rose]

Thanks for the suggestion...I'll take a look at the heat shield, but I'm thinking that isn't going to be the noise b/c I believe it's coming from somewhere closer to one of the front wheels...While I'm driving it's pretty loud/annoying, but as I start slowing down for a stop light it starts to fade and then it will stop right before I come to a complete stop...But I'll take your advice and check the exhaust heat shield this weekend...Thanks Again for the Help