I just got the bullydog tuner for me 2012 express. I Love the tune and ability to disable MDS, but I have one slight issue after it. Under load, when the engine is lugging along, usually when the TC is engaged, right before it downshifts it makes this rattling noise underneath the truck, almost like a loose skidplate or exhaust or something. I cant quite locate what it is, anyone have and ideas? I Have crawled under and nothing is blatantly obvious.
Thanks.
Thanks.
