I finished the front end swap in my 78 today and drove it down the road and thier is a BAD Clunk coming from the paasager side I drove with a passager and he said it was right under his feet-I think The ratious arm bushing is bad(thin) allowing movement I reused the old one that didn't look that bad- I'll just take the nut off the ratious arm and raise it up a lttle with a floor jack to take off the pressure and take old ones out(laft and right) and install new ones.
Could that be it?
I double and triple ckecked everything it's ALL tight with cotter pins in them
later
Dustin
PS it only happens over bumps IE my friggen driveway

 

annyone???????????/

 

Sounds like you're on the right track with the radius arm bushings. The C-bushings at the other end of the radius arms can do the same thing if they are worn too. Also check the tracking arm bushings.