What is the way to check if the SFBs (originals) are in need of replacement? I had the recall done several years ago, so the bolts should be OK. I do hear a metallic creak/tap when a turn left only, thought it might be subframe bushing-related. It might ultimately be a problem elsewhere, but I wanted to rule out the SFBs. Thanks. Jim Koper 1992 red on black 151,000 miles