Usually when I've run across a "no reverse" problem in an older automatic transmission, including but not limited to Nissans, it has been due to the retaining spring popping out of the groove of the reverse clutch drum. I've seen this on several RWD Nissan automatic trannies and some FWD Altima transmissions, as well as several Chrysler FWD trannies. The fix usually entails replacing the reverse clutch drum and snap ring (or the complete drum assy), but this involves removing and teardown of the trans. When dealing with a ten year old transmission or one that has a lot of miles, most would agree that it is more practical at that time to do a complete overhaul or replacement of the transmission.
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