Ever since I got this car the trans seems to make a humming/whirring sound that constantly breaks up in 1st through 3rd. It recently started to go away, but it reappeared this afternoon. The car has 123k miles on it and it has been regularly serviced. Another thing to note is that the trans will slip when accelerating hard in 4th and up (3rd when cold outside). Is this all just being caused by the clutch/flywheel, or is this something bigger? I know that it will probably be needing a new clutch soon, but I don't think that sounds like these can be caused by a worn clutch. I need confirmation.