Rough transmision on 2011 Toyota Corolla

I have rough transmision when I change my gear from park to reverse on downhill or uphill. I don't know what's the problem? I'd like to tell the TOYOTA mechanic when I do routine 5000 check up n oil change. Just don't know why it happens? Is it normal or something wrong with my corolla 2011? thank you so much ...

by in Los Angeles, CA on July 25, 2011
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