You seem pretty knowledgeable on the Comanche, there's also something I was a little worried about what it could be, it's an automatic if it helps at all, but when I press the gas it sounds fine but when I take my foot off, it makes a low rumbling, kinda like when you hit a rumble strip, I saw that an exhaust hanger in the rear was off the rubber hanger, I thought it might be the muffler hitting the heat sheild but I wasn't exactly sure. I have a video if that'd help at all