One problem related to transmission slip out of gear has been reported for the 2000 Nissan Frontier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Nissan Frontier based on all problems reported for the 2000 Frontier.
No specific events led to failure. At approximately 109,500 the transmission begain jumping out of first gear without warning. I had t be extremely aware of this when pulling ino traffic. At 110,079 miles, the first gear failed completely when I was pulling out of my driveway. The complete failure occured on Dec. 31, 2004. The sudden jumping out of gear started about a month before that. At the very least, Nissan should advise all owners of 5 speed manual transmission on Nissan crew cab 4wd units with a v-6 engine that when the gear box jumps from first to neutral position, that first gear failure is imminate.