One problem related to transfer case has 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.
Since I have bought my Nissan truck, I have noticed vibrations when in 4wd, especially when under load. On numerous occasions the transfer case is stuck in 4wd no matter what you do and it takes forever to get it out back into 2wd. I have taken it in for this complaint and have had no luck with getting it fixed. Finally upon my own inspection, I noticed 3-4 bolts being dangerously loose in the transfer case which is a huge call for alarm. I know many have this same transfer case issue and I would advise them to check the bolts! it may not be the answer but it definitely will lead to a major breakdown if left unchecked!.