my car does it too... took it to the shop the other day to get a diagnostic and they said my fluid was low and it was slipping and also i need to bring it back... something about mounting for the tranny was starting to go... but then again my car is stock and its has 80k miles... so with your mods it might be the same thing... they told me to bring it back when i could leave it with them for a day ant they would make sure.
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