904 Downshift Squall or Howl

Well, it looks like we finally figured this out....indirectly. The PO had arranged the belts so that the water pump was being driven from the slack side of the crank, not the tension side. (That same belt drove the Sanden AC compressor over on the driver's side.) That poor arrangement resulted in belt squeaks and squawks at start up and over 3000 RPM.

We put in an underdrive crank pulley and got the water pump and alternator belt set up as normal. Now, not only have the other belt squeaks and squawks stopped, but this downshift howl is all gone. It seems the sudden engine speed increases on downshifts was squawking the water pump belt.... man, it's always sumpthin'!