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help please

  1. General GM Discussions
    When I go from forward to reverse I have a bad rattle when the engine bobs down a little, that’s the only time I hear it other than sometimes at start up.
  2. Engine & Performance
    I just bought a 09 1500 4x4 with 5.3(m) today and got wives approval to do a performance mod. It will be my weekend ride. Below is a list of mods I’ve been looking into but not sure what to do in which order. -BT stage 2/3 cam, tuner & headers, injectors. My goalis to eventually have a more than...