I've got an 89SC 5-speed. I've replaced all 3 belts, and idler pulleys. While that needed to be done, since they were old and worn out, it has not helped the problem. Made it worse actually... But I'm attributing that to the engine being overall quieter. I recently upgraded from my stock 89 blower to a 94/95 blower with the 89's pulley. Could it still be belt slip? Sounds only like a squeal at certain RPMs in 2nd and 3rd gear from what I can tell, there's some noise at low RPMs but its not a squeal.