318is Dragging sound while rolling

[brickwhite]

My Project e30 91 318is is coming along slowly.

I just noticed while driving today a Dragging / rubbing noise from the Drive line.

I noticed it when I turned off the engine and put the car in Neutral and was coasting about 10-15 mph.

Could this be the CSB or the Driveshaft?

Thanks

[DesertBMW]

it could be anything

[Dakotademon7]

Jack the back wheels up off the ground with it out of gear, spin tires by hand to try and find location of noise.