I had somebody drive my car and they said the clutch was slipping. I didn't think so because I had a new clutch put in it recently. I don't notice any slipping in any gear but when I am doing 75 in 6th gear and I hammer on the gas I feel it slip a little. Is that normal or should I be concerned?

i wouldn't think it should be sliping at all in any gear or any speed

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