Pinion Angle/Tailshaft Bushing

The only reason I ask is I had a bad experience with a lakewood bell that some one put on and didn't use offset dowels to center it and it kept wiping out the pilot bushing, so in 4th gear the input and out put are going the same speed and it would whip the output and cause a rumbling noise, in 3rd the shafts are going different speeds so it seemed to cancel out the noise.