For the past few mornings, I've heard a strange rasp in first gear while getting my Mini up to speed.

It only happens for a split second around 3/4 into the range of first gear, before shifting to second. If I had an RPM gauge, I could tell you exactly when, but it has happened every morning.

Driving uphill or downhill and only in a straight line, whether or not I'm "pushing" the car through its moves...

Any thoughts?