Front-end knock when hot - steering, suspension or something else?

[theseoldcars]

Morning all (well, it is here, at least)...

Got an odd problem with my PAS-equipped '68. When it's been driving around for an hour and a bit or so, and fully up to temp, I start getting a pronounced knock from the front end.

It doesn't seem to do it in the dead-ahead, only when it hits something - and I'm pretty sure it's steering related.

I've had a gander underneath and nothing looks out of place (I've yet to do the same when hot, alas), but I thought I'd just ask in case someone had experienced the same. It sounds like it's coming from the column/box area but it might be a balljoint or something. Perhaps a top balljoint that doesn't have enough grease? Something in the steering coupling?

Any suggestions?

Cheers,

Lewis

[68Charger4me]

I had a lower shock bolt loosen up and it made a cracking noise when I hit a bump.

[PlainfieldCharger]

My strut rod bushing were bad causing a clunk from time to time.

[lukedukem]

this is very weird its happening when it gets hot. 

Luke

[theseoldcars]

this is very weird its happening when it gets hot.  

Luke

That's what baffles me! Is the coupling in the column heavily greased? I wondered whether it's overheating after a while and getting loose (I've not looked at it much, so don't know if it's possible), or something cockeyed like that. Or an engine mount softening and sagging?

I'm going to get the car out tomorrow, run it and see if there's anything obvious amiss. Did look previously but couldn't spot anything.

Whatever happens, I'll keep you posted!