There's nothing really wrong with the tranny, the problem is the slave. Nissan made the switch in 2007 to the CSC instead of the traditional slave with clutch fork to save money. There has been nothing but problems ever since. Nissan is doing a pretty decent job of sweeping the problem under the rug to avoid a recall, then again a recall usually requires a solution - which they don't seem to officially have yet. Dragging clutch causes all kinds of problems including notchy engagement, grinding, and premature clutch wear. Also failure is a serious replacement task where as the external slave was a simple bolt on affair.
They had a recall at the beginning of 08 for some of the problems the 07's were having with the slave.
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