Hi all...new to the forum but wanted to thank everyone for their very informative information and the extensive testing behind it.
It seems that all of the discussion in the thread was around '07 models. Has anyone found this to be a problem in the '08 models? My husband has a 2008 Tundra CM 5.7L 4x4 TRD Pyrite Mica. He intermittently hears this same humming noise described. He has also found it to go away when he switches into 4wd but is back again in 2wd.
Seadragon, if I'm reading your latest comment correctly it seems the TSB was issued in 2008 and the front diff. was updated in June 2008? That being said, our '08 Tundra was built in Feb. 08 and I'm wondering if it has an older problem some front diff. Does anyone know if the TSB also covers '08 models or was it just issued for '07.