[sujaylahiri]

When I'm upshifting quickly from 3rd to 4th or 4th to 5th gear, it seems that the transmission takes about a second before the revs settle down.

It doesn't happen all the time, but usually happens when I'm shifting very quickly, let's say at 60 mph (100 kph) from 4th to 5th gear at about 3000 rpm. It takes about half a second after I've released the clutch to drop the revs back to about 2500 (for that speed).

But if I lazily upshift and release the clutch gently, it doesn't happen.

My question is that is it just the flywheel being lazy and not being quick enough to catch the upshift, or do I have a slipping clutch.

Keep in mind that my car usually gets exposed to some really cold temperatures (about -40 to 45 deg Celsius in Northern Alberta), but I'm usually taking it into account when the gearbox becomes nice and warm and smooth after a little bit of driving.