CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed four classes of notes issued by Ally Auto Receivables Trust 2014-SN2. A full list of rating actions follows at the end of this press release. KEY RATING DRIVERS The affirmation of the notes reflects the increase in credit enhancement since closing and strong collateral performance. Credit losses have been well within Fitch's expectations, and residual performance has been producing cumulative gains. Fitch will continue to monitor economic con