1996 Suburban Front end bangs

[METAL MATT]

1996 Suburban Front end bangs
Ok I just picked up a 1996 Suburban 2500 4X4 and the speedo stoped working and there is a wicked Banging and screaming it seems to get worse when the truck is gearing down or turning a corner, Its really sounds like somethings broken lose. The Problem seems to lessen at lower speeds

Any ideas what this is?

Ive got a bit more Info for ya

at 120kph the banging Is BAD BAD BAD and It all of the suden it was as if the Brakes where slamed and the speedo went out and the RPM gauge flew up there, I thought the tranny went But once stoped I put it back in gear and away it went but still banging

I posted this once BUT in the wrong area.....Sorry