I have had some transmission issues in the last couple years and just want to get some input. While my car was down I had all of the worn synchros and shift sleeves replaced and at the same time we did diff bearings and the bearings on either end of the main shaft and countershaft. The transmission whined pretty bad before we did any of that work and we assumed it was the diff bearings. We replaced those with OEM and it got quieter, but was still present. Now that I've put a few hundred miles on the "rebuilt" transmission the whining is louder than it was before the new diff bearingswere installed. It does it in every gear, but loudest in 1st and gets quieter as you work your way up through the gears. I do remember there being a good amount of metal built up on the magnet when we first opened the case and I wasn't sure if that was debris from the bad bearings we replaced or gear material. It has the stock 2000SI open diff in it. I am leaning towards it being the gears in the diff itself, but wanted to see what people thought or had any tips on how to troubleshoot it before I start ordering expensive parts.