Thanks for reading. I have a 2005 4.8 (V vin code) with intermittant bad lifter knock. My understanding is this should not surprise me. I have a nearly new 2007 4.8 (C vin code) in a wreck :grrrrrr: I could put in. In a post on this forum I saw that the LR4 third generation ran to 2007 and the LY2 4th generation runs from 2007 forward. What if any problems will I have with a swap?