Because I still have the fragile 7.25" rear (with the 2.76 ratio) I haven't hammered on it at all....but on the few occasions where I would wind it up a bit (usually shifting manually around 5k) resulted in a chirp specifically not coming from the tires, that I THOUGHT was a belt slippage on upshifts...but after checking the tension on the (brand new) belts...this theory started to fall apart. Honestly, it doesn't make sense that this scenario would cause the belts to chrip anyway since an upshift would slow down the alternator and fan...not speed them up.
So I'm starting to worry that the noise is coming from the 904 slushbox itself.
