[Shotimes] Subframe bushings question

[jim koper]

I had the SFB recall done years ago, per the TSB (drill hole in floor, replace the bolt and retainer nut, apply patch to hole, etc). Last year I upgraded all four of my original rotted and torn gen2 SFBs to the firmer gen3 SFBs plus new bolts. 
   
  My question: was it possible to upgrade the SFBs WITHOUT opening up those patches to get to the retainer nuts? 
   
  When the shop replaced the old SFBs, it didnt pull the carpet back or undo the patches at all. Since the nuts were relatively new, maybe the TSB steps were not necessary as with the Ford dealer. A year later I am experiencing a metallic rap/clunk somewhere in the front suspension, and it feels like the subframe may be moving a bit under hard braking or even a 20mph-braking-LH turn. I will be replacing the front strut rod bushings that go into the front frame (TRW, part # HB1592K) and the FSB endlinks for good measure, but the way the SFB upgrade was done -- or not done-- has always concerned me. Thanks for your input!
   
  Jim Koper
  92 red/black
  172K