KMH001, thanks. Interesting. It seems that the relatively recent trend to giving owners taller gearing, hence longer legs and better cruise economy has some flow-on effects, for I see many gearbox problems stemming from the often quite tall top gears in a few models. Being a tiny gear, it is often working really hard and spalling is common, especially if lubrication to it is inadequate, such as in the old 5 speed Landrover County gearbox where a piss-weak fibre coupling to the internal gearbox oil pump almost always failed, causing premature top gear failure. 5th gear in some earlier Landcruisers is also known to fail occasionally, though I am uncertain as to the reason. 6th in the MPS6 is really tall and must be prone to similar effects, although I haven't seen an example of 6th gear "in the flesh". Your pics didn't work for me - pity.
CP_e Standback & PNP; CP_e 3" SS Downpipe; Corksport FMIC with Top-mount K&N filter & OEM Ram CAI; Turbosmart BOV; Dashhawk; Prosport Boost Guage; JBR solid shift bushes; DBA 4000 Wiper-Slot front rotors; Hawk Ferro-Carbon HPS Street front brake pads (@ 69,000km); Sumitomo HTRZIII's in 225/45 x 18