I cant imagine its the rear axle. My thinking is perhaps the gearbox input shaft is still spinning as you are selecting first just moments before you dip the clutch. Im probably talking horse shite though.Mine has a bit of a clunk when dropping up the gears to a junction - only when selecting 1st when doing very low speed. It clunks at what seems like the rear axle. Normal gear changes is fine. Got 152k on the clock. Curious to know if the axle clunk is something I need to address?