I am not sure if the autobox is designed to do this as a normal function, program wise. If you are going down hill on the over run, i notice on my car that it will drop down a gear braking or not, but as it does this the revs do increase before dropping down . This i would imagine is to up the revs to accomodate the lower gearing. I know that there is a time delay whilst braking before this actuates in seconds , but im not sure with a manual change. Sometimes these boxes do get into a pickle program wise now and then,as they try to memorise driving style . If things seem ok now , then maybe the box has "learned "....
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