CHICAGO--(BUSINESS WIRE)--Fitch Ratings has upgraded the Issuer Default Ratings (IDRs) for Allison Transmission Holdings, Inc. (ALSN) and its Allison Transmission, Inc. (ATI) subsidiary to 'BB' from 'BB-'. In addition, Fitch has upgraded the ratings on ATI's secured term loans and secured revolving credit facility to 'BB+' from 'BB' and assigned a Recovery Rating of 'RR1'. A full list of the rating actions follows at the end of this release. The ratings apply to $2.4 billion in secured term loa


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