Mc_76

Hi All, I went for a beach run yesterday and noticed when in coasting in 4th gear (H4) I would get a rattle/vibration through the car. Tested it in H2 (hubs still locked) and no issues. No apparent issues at lower speeds either. The noise would only be present when first lifting off, and then go away after a couple of seconds (while still coasting) Can anyone point me in the right direction? My truck is a 2012, 76 series, 80,000km. 2 inch iron man lift. Ta