Hi just got my nav back from Nissan and thought I would share my recent woes. Back in Feb I was taking off from lights nice and easy when BANG went the auto trans and I lost drive. Rolled around the corner and checked things out but could not see any sign of problem, No warning lights, no oil leaks. Forward & reverse both the same. Called for the recovery truck and took it straight to my dealer. Now this is a relatively new STX with less than 8000km on the clock, not driven hard and only 4WD has been light work on the beach. My Nissan dealer was as surprised as me when they looked at it as this trans supposedly does not have any known major issues but they immediately provided my with a brand new 2011 ST to drive while they checked out my truck. I have to say at this point that my dealer has been great in keeping me on the road and informed of progress. Initial investigation indicated internal transmission failure. Signs of oil overheating but not clear if a cause or symptom. Remedy was to replace the complete transmission under warranty. Unfortunatley there was no spare readily available and it has taken some time to get here but finally it arrived and I am back on the road after 8 weeks. Nissan are sending my old trans away to their engineers for investigation so I have no info on what the actual internal condition was. My dealer checked out my truck for any contributing cause including transmission cooling system but all good. Hopefully this has been a one off problem and I have a long & happy nav future. I have read a lot of negative comments about Nissan dealers and warranty issues but for me I have to give my dealer & Nissan a big thumbs up for taking ownership of the problem and providing me with a replacement nav so I wasn't inconvenienced in any way. 
