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I *think* it's 90k mi ... refer to your owners manual.
You can change a Honda Civic HX transmission to a manual transmission. It is not an easy job to do.
The 2001 Honda Civic has a 5-speed manual.
The 2009 Honda Civic has a 5-speed manual.
The 2014 Honda Civic has a 5-speed manual.
The 2013 Honda Civic has a 5-speed manual.
The 2003 Honda Civic has a 5-speed manual.
The 2008 Honda Civic has a 5-speed manual.
The 2004 Honda Civic has a 5-speed manual.
The 2010 Honda Civic has a 5-speed manual.
The 2006 Honda Civic has a 5-speed manual.
The 2005 Honda Civic has a 5-speed manual.