Whem in reverse the cars jumps an knocks and hesitate to go back? on 2003 Mercury Mountaineer

When in reverse the cars jumps an knocks and hesitate to go back and will do it when I put it in drive an then stop , I was told that it was normal .help

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3 answers
Iwould take it to a tranny shop and have them diag the problem
Replace transmission.
seek a free diag and est from aamco then shop prices