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I recently changed the transmission on my 1992 Nissan 240SX. The clutch is basically brand new, but a few weeks ago it started slipping. At first it was just a bit and only after I had been driving for a while, but now I've got no clutch at all. I took it to a garage and they told me I had the wrong clutch in. They replaced the clutch and the master slave cylinder and said that would do it. $770 dollars later, it is still slipping. I have asked everyone I know and no one seems to have ever encountered this problem before. Does anyone know what this could be?  

This is exactly our same story!!!!! same year same car same story.  Have you learned anything yet?  If we figure it out we will post here to share what we have learned.