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Hi I'm sorry to say that I had exactly the same as you last year with my 2002 3.0 litre and the reason is that the box has gone I'm afraid. There is no way of checking levels etc, as the J gate box is a 'sealed for life' unit and as such it doesn't form part of a normal 'service schedule'.. With mine in April last year I had taken it to an auto gearbox specialist in Barnsley and supposedly the ATF was changed- 7 months later my gearbox did exactly the same as yours with no warning whatsoever. Possibly the work was not done as I was lead to believe it had, but I'd never be able to prove that. It still drove perfectly in forward gears but when I 'hit the net' I found that what had happened was a usual symptom of a failed box. The rest of the car, which had covered 124k, was amazing, so I was a bit pee'd off as you can imagine but the repair for me was beyond economical sense. Can I suggest that you contact member bertieboy9- he does have the expertise to change an autobox (he's doing one on his own car at the moment I believe) and as he breaks X types he may well have a replacement box available. He's in Leeds so if you have to travel it's not too far- as long as you don't need reverse!

Obviously the first place to look would be the transmission fluid Rod which have obviously been making an attempt to check. Not having an X type I am unable to direct you the dip stick however it's obviously there somewhere. If fluids are found to be fine then I'm afraid to say it's a Jaguar Independent Specialist or a Automatic Transmission Speacilist. I wouldn't take that problem to a Stealership it would be an arm and leg job. You could keep driving forward and get her indoors to push you back into car parkin spaces :-) sorry for the pun