Two problems related to differential unit have been reported for the 2006 Nissan Frontier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan Frontier based on all problems reported for the 2006 Frontier.
Rear differential pinion seal and rear axle seal leaks causing gear oil to leak on brakes causing loss of rear brakes. First and last Nissan!.
The right side rear axle seal failed in June 2008 causing differential fluid to coat the entire rear brake assembly leading to my emergency brake not working correctly. It cost me about $600 in 2008. In January 2009, the left side rear axle seal failed in causing differential fluid to coat the entire rear brake assembly leading to my emergency brake not working correctly. It cost me about $600 in 2009.