Disco 2 Auto box

I have a early discovery 2 td5 auto. Having a problem with the automatic gear box. About 6 months ago I changed the gear box oil, ran it for a few hundred miles and changed gearbox filter and oil again. Everything good up to a week or so. The box seems to be changing up through all the gears ok ( sometimes a bit slow changing up) but main problem is once in top gear the revs stay high. It used to always feel it had changed up another gear when the revs dropped down but it's not doing it anymore. Checked level of oil and all good with no burnt smell. Has anyone got any ideas what it could be. Thank you in advance for any help you guys can give

That "extra gear" is the box locking up which happens at around 56 mph in Drive. Remember it doesn't happen when the transmission fluid is cold (but I don't know how warm it has to be). Mine will lock up in 4th after driving for about 5 miles (the minimum I can do till I get out of a 30mph area).

Sierrafery will probably know more.

iansoady said:

That "extra gear" is the box locking up which happens at around 56 mph in Drive. Remember it doesn't happen when the transmission fluid is cold (but I don't know how warm it has to be). Mine will lock up in 4th after driving for about 5 miles (the minimum I can do till I get out of a 30mph area).

Sierrafery will probably know more.

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Mine was much the same as yours but it doesn't lock up anymore. Going to cost a fortune in extra fuel if I don't get it sorted