Driveline Noise Help

[laredo_hustle]

Ok so it all started like this. I have a 1997 nissan 240sx SE that did not come with a VLSD(YEAH!!! One wheel wonder) So to change that I went to the Junk Yard and got my self a 1996 J30 VLSD. I bolted it on my car with no problems, the only thing was that my car did not have ABS so the driveshaft barely fit but I installed it anyways. After I started driving I notice I slight rattle noise coming from under my seat every time I pressed on the gas pedal going 30mph or more. To tell you the thruth I do not remember if it did before a change the pumking. Anyways I thought it was the driveshaft being to tight on there so I order my self an ABS 1 peice driveshaft to see if it would solve the problem. After I installed and drove it for a while I notice that the sound was still there. It is not to loud or it does not make my whole car shake or anything. I was thinking of turning the driveshaft 90 degrees and see what would happen. What do yall think it is.

[moso]

i would be more inclined to think your getting noise out of your exhaust shielding than your brand new drive shaft.

[laredo_hustle]

It is not really a rattle per say, it is more like a thump, vibration kind of noise.