We briefly covered what I knew about the T5 vibration issue on the 1st or second page of this thread. He stated something about trying a shorter transmission mount. I think I supplied a couple illustrations and maybe a link or 2? And I don't remember if the tail shaft is centered or offset, but I know the engine is offset. So it would stand to reason that the tail shaft might be offset. And I think the axle is offset as well, so that all should bring the driveshaft into phase. But I think you're running a 9" right? I guess it all depends on where your pinion is in comparison to the stock 8" location. As luck would have it, I have an old 8" here along with a couple other parts that my brother in law and sister were storing for me. I'll be loading them into my truck when I leave so they're out of their hair. I can probably get some measurements if needed now if you wanted to double-check your axle in comparison to a stock axle.