I used the word 'clunk' in my post but in hindsight it is probably not the best description. What you said about the auto not liking the change, or as someone else said the trans "grabbed first" rather than quietly changed down, is probably a better way to describe it.(It is like the handbrake was being applied at the same time). I won't be doing it again cause I think if this change was done regularly it could damage the auto. I am leaning to the view that there is nothing wrong with my vehicle, that this is a characteristic of this type of auto, particularly when I read in this thread that others have had the same experience. The only reason I did the change in the first place was because I live in Toowoomba which is at the top of a very steep range. On this day I started the descent down the range but soon after I struck stop start bumper to bumper traffic due to an accident further down.I was in sports mode and to reduce the use of the brakes I downshifted from 2nd to 1st.
Merv