The company had sold 6,275 units during the same month of 2013, Ashok Leyland said in a statement.
Sales of medium and heavy commercial vehicle during the month went up by 85.34 percent to 7,210 units from 3,890 units sold in the year-ago period.
Sales of light commercial vehicles in December 2014 dropped by 12.78 per cent to 2,080 units from 2,385 units sold in the same month a year ago.
In the current fiscal, the company has sold 70,743 units as against 63,294 units sold during the same period of the previous fiscal, up 11.76 percent, it said.
Shares of Ashok Leyland were trading at Rs 58.00 per scrip on BSE, up 8.61 percent from the previous close.