my personal experience with any old mopar I've ever driven in - they all (almost all) do it. that seat of the pants vibration that oscillates whether you're driving, sitting in park and varying engine rpm's, etc. that kind of feels like bad u-joints.
Because my AAR does the same thing (and i'm sick of that cheap, vibrating, resonating that never goes away) I've asked the same question on other forums - and it's usually a brainstorming session of engine mounts, tranny mounts, tailshaft bushings, driveshafts out of balance, the need to change to an aluminum driveshaft, correct torque converter, etc. discussion that never ends in a concrete answer.
I've just accepted the fact that mopars have that quirk. Not sure why, maybe the R&D didn't do their NVH homework.
