Front end clunk noise when goes over pothole or bump

hi all,
My TL is getting close to 86K miles and I've noticed clunk when it goes over pothole or bump.
The clunk noise comes from front passenger side.
The strut and spring look ok... no rust..
They don't bounce much when i do the fender push down test...
Is it possibly the stabilizer bar??
The TL has really stiff suspension and this can wears out the stabilizer bar fast...
Has anyone have similar problem?
Thanks.