if it only happens when weight shifts to the front then I'll bet one of your bushings in the back is actually at fault. I've gotten sounds that seemed like they were in the K-member and even the passenger side door that turned out to be in the rear suspension. For me it was binding from a bad adjustment on my PHB binding up the UCA's decelerating into turns. I'd give a serious looksee to all the bushings in back.
Another possibility is that your k-member itself has a loose attachment point (including the cross brace at the back of the oil pan). I've seen that in cars that have curbed themselves... they'll actually end up with the k-member moved and it'll get some rub under load.
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