last weekend my wifes S developed a clunk when u punch it on drives side only. i have been searching, stabilizer bar bolts r tight, shock bolts tight. only thing i found is axle nut may have loosened a bit because cotter pin was between the castelations so i retorqued the nut and put new cotter pin which now sits in the castelation. still has a thunk when u punch it. i noticed the housing where the brake pad pins go thru is square and im thinking this might b where im getting the clunk. anyone have any advice on anything else i should look for. all rear diff bolts r tight

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