It is a vent tube to let pressure out of the differential housing.
The 2014 Chevrolet Suburban has 41.1 in. of front head room.
The 2011 Chevrolet Suburban has 64.4 in. of front hip room.
The 2008 Chevrolet Suburban has 64.4 in. of front hip room.
The 2004 Chevrolet Suburban has 41.3 in. of front leg room.
The 2012 Chevrolet Suburban has 65.2 in. of front shoulder room.
The 2006 Chevrolet Suburban has 41.3 in. of front leg room.
The 2010 Chevrolet Suburban has 41.3 in. of front leg room.
The 2003 Chevrolet Suburban has 41.3 in. of front leg room.
The 2009 Chevrolet Suburban has 41.1 in. of front head room.
The 2002 Chevrolet Suburban has 41.3 in. of front leg room.
The 2003 Chevrolet Suburban has 61.4 in. of front hip room.
The 2014 Chevrolet Suburban has 65.2 in. of front shoulder room.