There is a fill plug on the side of the transmission. Remove the plug and if fluid does not run out then insert your little finger in the hole and crook it. If you do not feel fluid then service it to full. If you are driving and hear a noise from the transmission, then it is to late.
The 2002 Subaru Legacy has a 5-speed manual.
The 2008 Subaru Legacy has a 5-speed manual.
The 2011 Subaru Legacy has a 6-speed manual.
The 2009 Subaru Legacy has a 5-speed manual.
The 2005 Subaru Legacy has a 5-speed manual.
The 2006 Subaru Legacy has a 5-speed manual.
The 2010 Subaru Legacy has a 6-speed manual.
The 2013 Subaru Legacy has a 6-speed manual.
The 2014 Subaru Legacy has a 6-speed manual.
The 2012 Subaru Legacy has a 6-speed manual.
The 2003 Subaru Legacy has a 5-speed manual.
The 2001 Subaru Legacy has a 5-speed manual.