I just had the gears done and all the bearings and stuff replaced as well and all the noise i heard from my tranny was traveling up the driveshaft and to my transmission. I had a rear end wind as well but its amazing how much quiter it is now the inner rase on the pinon was in bad shape had big gash in it. i believe this is due from oil starvation from a old leak i had along time ago. I will say i recommend when one does gears to replace all the bearings, and 373s is making my car so easy to drive i cant wait to break in the gears so i can really get on it. Tomorrow im going back to put on the output driveshaft speedo gear and tooth. once i would remove my drive shaft and then turn the rear end by hand it would hesistate, wouldn't even turn smoothly, ill have some pics up later once i find my SD card reader