I have a 2018 3500 srw larime. At 27,000 miles rear end started whining at 65 to 70. Took it in to dealership they replaced pinion and ring gears and all the bearings axel to axel. Got the truck back said it was fixed but it still whined. Took it back they ordered new parts. After six week the factory cancelled order. Now the factory says they need to order new axel housing with all new insides. Ben without my truck for three months. What can I do to speed this up?