I have an '05 100 series TD LC (8K kms on the clock) with an Automatic transmission. I have noticed recently on going down a long descent above 75km/hr if I touch the brakes the transmission will change down to 4th and atleast once down to 3rd. I am sure that this has not always been the case. Is this normal. To get it back into 5th I need to accelerate and then deccelerate. I am also unsure if the automatic change criteria is constant. Sometimes I think that it changes up too easilywhen I accelerate. Also does any body know exactly what happens to the gear change criteria when the ECT is selected. I can't seem to figure what actually changes.