Fitch Ratings on Thursday upgraded the short- and long-term issuer default ratings on GMAC, in the wake of the Treasury Department recently pumping $3.8 billion into the struggling company.

GMAC is the parent of Residential Capital Corp., the nation's fourth largest servicer of home mortgages. Fitch upgraded both ratings to 'B,' noting that GMAC "has addressed the capital shortfall identified through the Supervisory Capital Assessment Program."

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