I have a 04 lly. that I have down a few mods from this forum.I find this to be a very informative forum for those of us that are new to the duramax. I have reworked my mouthpiece, blocked the egr, and rerouted the pvc. I have a couple of questions if I may. when I get on the throttle reasonably heavy, I get a noise quite unlike loud lifters, emiting from the right front of the engine compartement. secondly, I have read a little about the wear thru in the front diff?. any info on this would be appreciated Thank You Doug