2010 Range Rover 5l supercharge, have flushed the 6 speed automatic box twice now, by dealers, but all gears only change at high revs and if I take pressure off the throttle, especially when going up hill or gradient. Level road she works great provided I am gentle on the throttle. 154000km on the clock now, dealer has run out of ideas and is suggesting a new gearbox, anybody have similar problems

 

my disco is stuck in low range what can i do