Mine crunched from 1st to 2nd and occasionaly from 2nd to 3rd when cold and also had a stubborn cluncky change which is partly a trait of this gearbox (VAG group have got alot to learn try Honda Civic Type R)
last time i looked up this topic there was one post back in 2003 with one reply i think, yet when ever you mention it to a seat dealer or seat uk even now they act as though its an isolated
problem (heard rumors of problems with the 6sp box in audis back then).
The Dealers looked at me like i had two heads when i suggested the sycromesh was worn or the quality of gear oil was poor, when i noticed the
problem with my gearbox i reported it to Premier Garage in Leek at the time with only 3 months warranty remaining, who suggested it was wear and tear (interbred ******s) and then tryed to get out of the third year warranty by saying the service schedule had not been met.
A lengthy battle with Seat UK followed lasting about 6 months, with me writing to the CEO threating legal action against Seat UK and Premier Garage. I then got a replacement box outside of the warranty period, which improved the gearshift for a time, which i think had more to do with the summer months and higher ambiant temperatures, as the old box was fine in summer.
The change started to get clunkey again after about one month, so i took it back again and after another battle the gear change cables were tightened again, which improved the shifting. The gearbox still remains untested in sub zero temperatures when the crunching is more apparant.
My car is currently residing with lookers in stockport where it awaits a new spec gearbox oil (fully synth 75-90 watt, i think) and the sixth attempt to fix the water leak, all under good will waranty as is now 8 months out of warranty.
This car has been a dog with many other problems and dealers who take the piss to boot.
My first and last seat FOOKIN SHITE