One problem related to transmission not engage has been reported for the 2007 Nissan Frontier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Nissan Frontier based on all problems reported for the 2007 Frontier.
For approximately 1 month prior to the transmission failing, I notice a "bucking" from the transmission following shifts and only at low rpm's. I had the transmission fluid levels checked during an oil change in January 2014, and fluid was added (the transmission was not flushed. ) the "bucking" seemed to subside for a few days, however what I next experienced next was far worse. On three or four occassions, the truck suddenly acted at though the transmission disengaged, as if it were in neutral. Each of these incidents occurred on 4 lane highways, at highway speed. As I recall, on at least one of these occassions traffic was very light, and I was able to safely exit the highway. However, on the other occassions, the sudden loss of speed and ability to accelerate very very nearly caused a serious accident.