don't want to burst the happy bubble, but this magic fix could be as simple as resetting the tranny adaptations which would make the shifting smoother and feel different for a short time. when the transmission begins it's "learning" phase again it will go back to lurching and doing all the strange things it did before............i think. i could also be completely full of sh*t. i hope the fix works.

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2006 4.8iS Black/Black with custom Audison Voce/Image Dynamics sound
Production Date - 10/05