Thats what I'm most worried about with this diff. Its still street driven and I hope that if I drive sedately on the street it'll stay fresh for a long time. If a diff rebuild can be eeked out to the same cycle as a clutch, that would be good, because pulling out the whole gearbox to refresh the plates at half clutch intervals (or worse) will get very old very quickly. The wavetrac/torsen will last forever (although I'm starting to hear of quaife ATB's not doing that) but even if it does last, the clutch limi is going to cost a hell of a lot more just with regular oil changes alone, to keep it in goofd health. Think i'll take my time and build up the spare box. Then when my current clutch cries enough or if it dies on the line at a hillclimb or something, i'll have a plug and play box ready to go, and do the swap then.