Problems with the change box in Ford Focus 2000

I have a Ford Focus year 2000, mechanical box and when the changes pass, from neutral to first and second to third, a very ugly noise sounds, as well as worked gears. When passing through another march it sounds at all. I have taken it to three different mechanics and they tell me varied reasons and problems that do not really convince me. They tell me about the clutch, another of worn synchronous rings. etc. please that someone enlightens me, chau :(

The first thing you have to look is if you have valvulina, if you have taken it to three mechanics, I suppose you look at you, it may also not be clutch, see if the clutch cable is too fojo or if the lever of the thrust bearing reaches the end, if the synchronized rings are spent prove to remove the emptying cap of the change box, it has a magnet and if you find you You know, a bad sign, anyway the cheapest if the problem is from the gearbox is that you go to a scrapping and look to see for you could break yours, in short I hope it serves you something, a greeting

Try the change the miracles slick50 for gears