So my 89 sc started making a slight knocking noise and it sounds like a rod knock from a bearing starting to go but the sound seems like its coming from the crank pulley not inside the case itself. I had it on a rack running and looking underneath it and it looks like the crank pulley has about 2mm of wobble in it and you can see the serpentine belt walk from side to side on the water pump as its running. If it were any other vehicle Id say its a bent crank or bad rod bearing but I always hear that these cars have problems with harmonic balancers and before I shell out a million dollars for one I want to be sure. I might be able to post a video but idk how clear it will be. Any comments and tips are greatly appreciated.