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I have a kr41 townace which i converted to diesel with a 3c turbo engine 2yrs back. Its a good unit and has given no probs until now. It has an auto gearbox. Now there is a delay when upshifting of gears regardless of whether I accelerate hard or lightly. The 1st gear wont change until 20kmph however lightly I press the accelerator pedal. 2nd at 38kmph, 3rd at 56kmph and O/D at 68kmph and these speeds are fixed. It used to not be like this before, in the sense if I accelerate lightly the gears shift very early. Its a problem when driving in the city because the engine is revving unnecessarily. When driving quick its not a problem at all, the engine power and acceleration is all fine. I noticed this problem right after the recent service. but no atf change was done during this service. The atf has been changed in the previous service and its good. Please advice what I should do coz my regular mechanic is clueless. Thanks loads.