Ok here we go... 04 Silverado 2500 6.0. 4" RCD lift aprox. 35" tires. New idler arm inner and outer tie rods, upper and lower ball joints, front end is tight.

The issue I am having is when I start off from a start I get a slight vibration from the rear end or drive shaft. Its very hard to tell. Could this be axle wrap from the 4" blocks in the rear. If I start off real slow I don't feel it. All tires are aligned and balanced. Anyone else have this issue? Its only at start from a dead stop and no other time do I feel it.