Noisy transmission on deceleration

[kdillard21]

I have searched on other sites and found many people with the same problem. Really no solutions. I dont know where else to look. My problem is that I did the 5-speed swap about a year ago without any problems. Put on a fidanza lightweight aluminum flywheel, spec 2+ clutch, driveshaft shop aluminum driveshaft, and I already had aluminum pulleys, also have a B&M shifter. It hasn't been all that bad until recently, but now its LOUD when i left off the gas to let the engine brake. push the clutch in, goes away. it can sit in neutral and I can here the same noise but much softer. i recently had the driveshaft off, but there is no alignement marks, and they dont instruct it to be "aligned" for balance. Everything seems tight, but its like a pack of wild bees is trying to jump out of the transmission.