I purchased new in 08 a 3500 quad cab 4X4, . 410 gears, cummins, automatic, long bed. Has 26,500 miles. It had a vibration. Dodge dealer had me bring it in April 24, 2012 and determined the problem is a out of spec differential. Dodge doesn't have one. Called their customer help line and talked to Sandra, Francisco and Gus who said none are in stock and he doesn't know when if ever they will be. I sent letters to Chryslers president and board members with no response. I just rejected an offer on my house because I have no truck to move with. (I have the offer to prove it) I've had it. Almost 3 weeks with no truck because Dodge is to cheap to stock parts!!! I'm retired and can't afford another payment or I would trade it for another brands 1 ton Diesel today. Please give me some suggestions. Has any one hired a lawyer in a situation like this? I asked my dealer if I purchased an after marked differential if they could install it. They said I would have to pay for everything and It would void my powertrain warranty. Help Rick