crunching sound sometimes when changing into second gear

[tobiasr]

Thanks for all the answers.

I have no idéa how to dubble clutch, is there any good guide on how to do that? If i have to replace the transmission or repair it, what would that cost?

I usually change from first to second on about 3k to 4k rpm, sometimes when racing its on the redline.

The crunch sound has happened perhaps 5-6 times in a year, but it is always hard to shift 1 to 2, or 3 to 2. No difference if the car is hot or cold.