Ok, just finished another 6 monthly service on me disco, nothing major found, all filters changed and diff oils. Transfer box was checked but was as clean as the day I filled it as was the gearbox so they were left until next time.

Two problems coming up, the rear diff pinion seal is ****ing a bit now and the transfer box output seal is ****ing into the handbrake drum again, this was oly replaced last year and no it wasn't britpart!

So questions are, is the diff easy to fix? (I have proper uj joints) and why would the transfer box seal fail so quickly??

diff seal is easy , remove prop , remove nut and bingo there she is , transfer box seal failing early may be that the breather is blocked , or , not quite fitted all the way , or , small amount of damage to seal or transfer box when fitted . Hope this helps .

Good news on the diff then, with he transfer box, I recall there being a bit of wear on the hub flange, new flange worth getting??