Meritor Inc. released its fourth quarter report on Tuesday announcing a surge in profit for the quarter, driven mainly by continued strong commercial truck sales in all regions. Shares dropped 13 percent on the announcement signaling investors weren't overly impressed with the results.

Troy, Michigan-based Meritor's attributable net income for the quarter rose to $31 million or $0.32 per share from $2 million or $0.02 per share in the prior-year quarter.

Meritor said revenues grew 29 percent to $1.22 billion from $941 million last year, driven by continued strength in truck demand with all segments contributing to the growth.

The commercial truck business, Meritor's largest by revenues, improved to $768 million from $547 million last year, fueled by higher volume in all regions. Sales from the smaller Industrial and Aftermarket & Trailer segments also advanced from last year.

Selling, general and administrative expenses for the quarter dropped to $66 million from $74 million last year.

Looking forward to full year 2012, the company expects to generate revenues of $4.8 billion, but analysts currently estimate revenues of $5.34 billion for the full year 2012.