Try buying the guys at the local Hyundai dealership some donuts; it may get you further than you'd expect.
The transmission filter is located under the transmission on a 2002 Hyundai Sonata. it is under the transmission drain pan.
The 2004 Hyundai Sonata has a 5-speed manual.
The 2005 Hyundai Sonata has a 5-speed manual.
The 2002 Hyundai Sonata has a 5-speed manual.
The 2007 Hyundai Sonata has a 5-speed manual.
The 2009 Hyundai Sonata has a 5-speed manual.
The 2003 Hyundai Sonata has a 5-speed manual.
The 2006 Hyundai Sonata has a 5-speed manual.
The 2001 Hyundai Sonata has a 5-speed manual.
The 2012 Hyundai Sonata has a 6-speed manual.
The 2010 Hyundai Sonata has a 5-speed manual.
The 2011 Hyundai Sonata has a 6-speed manual.