One problem related to power train has been reported for the 2001 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Nissan Altima based on all problems reported for the 2001 Altima.
At 70mph car gives a big jolt and with no warning, transmission drops from fourth gear, engine revs to 6500 rpm (engine in red line at 6300), car pulls sharply to right. Another heavy jolt, and engine revs drop to normal and transmission goes back to fourth gear.