Help Knocking from behined dash

[Ska]

Hi
Not sure which section to put this in but trying to diagnose a knocking noise evident mostly below 30 mph, mostly around 1-10mph and nearly always when coming to a stand still or moving off. It sounds like its coming from behind the dash and can be felt through the steering. Checked out the suspension and track control arms - they seem fine, no play. Turn the steering side to side (both stationary and in motion) too but can't get it to repeat? Thought it was a worn steering U-joint. It sounds like some thing is loose and getting worse day by day with more and more knocking. PS I cant hear it outside the car??? Its driving me mad making me think something about to let go big time, any ideas?
'97 2.8sport (FWD)173k on the clock

[PsYcHe]

You got any kind of car kit installed? these sometimes get tucked up behind dash and can work loose then bouce about.

Maybe a transmission mount and just the way it's echoing about?

[Nollywood]

Check the front suspension upper arms.

[Ska]

Both of the items are fairly new and OE as I had them replaced a couple of years back. Although under Nollywoods advice I had a quick look at the upper arms as I recall hitting a nasty pot hole a few weeks back and I'm sure the suspension may have taken a turn for the worse - I can see a clear mark in the wheel well just a I've the front upper arm so am guessing the uppers are shot. Btw what kind of car kit are you referring to?

[PsYcHe]

A mobile phone car kit was what I was on about...

[RanjS8]

To test the upper arms undo the pinch bolts and release the ball joints and then just move the arms around...if they are creaking it will be obvious then....