16v eco-tech hello to all driving a calibra last edition bj 97,136ps,x20xev.120tkm. f18 transmission… I suddenly noticed last week when driving (in the city) a strange clacking in the area of the coupling..Unfortunately the clacking stopped as soon as I gave gas.. also in the push operation the clacking was to be heard despite kicked coupling…in standing and giving gas there is nothing to hear…then I drove the next day to opel…. n…when the gearbox was dismantled, chips were discovered on the main shaft and on the drive wheel!! when they called me the price for a new gearbox, I almost fell off the stool..2500eurons + enbau.. now my question: does anyone have a similar problem? should I install a used gearbox from the scrapter dealer (700euro) without installation! whereby I have my fear that the same problem can recur with the gruesome f18 gearbox.. or should I have my own gearbox overhauled??? Is this a general problem with these f18-powered??I hope someone can help me how to get a low-cost and reliable transmission..is the f20 of the old 16v also suitable?? urgently need help from experts..