[ron69912t]

I am by no means anykind of front end expert but could it be comming from your front stabilizer bar or its linkage. I know on my 69 it is connected to the a-arms.

Could it be a loose battery banging around?

How about a loose headlight bucket?

When the wheels are down you probably can't shake it as much as when they are up.

Any bad rust or cracks around the a-arm nuts welded to the pan?

Just trying to be helpful.

Thanks,
Ron D