If you are referring to a slightly harsh bump when it is shifting, that is perfectly normal and is common in those cars. Mine does it as well (also an 04 lesabre). There is an aftermarket shift kit that can be installed in the transmission that costs around $300 installed, however it is not necessary.
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If you are referring to a slightly harsh bump when it is shifting, that is perfectly normal and is common in those cars. Mine does it as well (also an 04 lesabre). There is an aftermarket shift kit that can be installed in the transmission that costs around $300 installed, however it is not necessary.