Does our front diff have a limited slip in it?

[Dug]

Phil, do you know if the front diff. needs any supplemental additive in it. Like some rears have a posi additive. I'm asking because my front end is making a harsh noise/chatter . I have looked at the ujoints in the driveshaft and looked at the front axle shafts, they feel tight. The noise/chatter/vibration is only when its criusing and not under strain. When its under power or turning the noise goes away. Maybe a wheel bearing?? or something, just looking for someones idea before i tear in to it. Thanks doug