Pulsating Noise after 9" Install

[Ed Blown Vert]

The new rear is in, and after a few hundred miles it starting making a pulsating noise.

I hear it mainly when I am coming to a stop. And when its cold.

2nd half of the vid was in reverse.
Noise

Don't know what it is.

[Cutlass]

Does it seem like pulsates at the same rate as the tire revolutions?? It seems that way in the video but I can't see the tires spinning to tell for sure.

[Ed Blown Vert]

Yes the same as the tires.

[Cutlass]

well that eliminates the driveshaft and pinion since they spin 3-4 times for every one revolution of the wheels.
So that leaves the ring gear, side bearings, axles, brakes, and wheels as a possible noise source.

[Ed Blown Vert]

It was the ABS sensor. Pulled it out no more noise.

I guess I need to space it up a bit.