Please make another appointment and PM me with your dealers, VINs, mileage, and contact info so I can escalate this for you.
Thanks for asking about this and trying to take care of me. I actually looked at my wheels this morning and one has a TON of weights on it (26 to be exact). I don't think that one is balanced correctly and it's now on the back which could def cause the seats to shake. The other wheels only have 3-6 weights on them but one has 26.
I'm going in the morning to have them look at my balance again and make sure it's done correctly.
At this point, I don't think the car is the issue w/ the shaking but I'll let you all know tomorrow if it corrects my problem.
2012 black on black GT Premium Auto 6R80 - 400A
20 x 8.5" AR Torq Thrust M - BMR springs & Koni str.t shocks - GT500 mounts - J&M LCAs - CHE reloc brackets - J&M panhard - General GMAX AS3 - GT500 axel backs (no resonators) - GT500 spoiler - MMD tail light trim - Roush side splitters - AM upper/lower billet grill - Bama 93v2R tune - Airade CAI