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Old 05-25-2002, 09:45 AM
gidpor gidpor is offline
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Join Date: May 2001
Posts: 356
If it is not the entire seatback thumping, but mostly the center, it could possibly be the stem/rail mechanism that supports the headrest (just a guess here)
It functions like a ladder of sorts - perhaps it's loose on the bottom - so combined with the sudden pressure of the drivers head against the headrest it pushes it... etc etc.

good luck
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