GMAC Mortgage Group announced that it will use an on-line system from Excelis, a unit of First American Corp., for servicing its $54.5 billion portfolio.

Mike O'Brien, president and chief executive of GMAC Mortgage, said the system would help it manage and expand its portfolio.

Landing a customer as large as GMAC Mortgage, a subsidiary of General Motors Acceptance Corp., could be a boon for Excelis.

The Excelis MLS system was well regarded but languished when the company was owned by the now-defunct Lomas Mortgage. Prudential Home Loans bought the unit this year and sold it to First American, which is based in Santa Ana, Calif.

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