- TSBs
Duramax flywheel housing seals
Some GM vehicles equipped with the 6.6L Duramax diesel engine were involved in a mid-year change. Some of the vehicles may have been built with a flywheel housing that uses two different style seals (left and right). This applies to 2010–2012 Chevy Express, 2011-2012 Chevy Silverado 2500HD/3500 Series, 2010-2012 GMC Savana and 2011-2012 GMC Sierra 2500HD/3500.