Shares of Allison Transmission (ALSN) have been strong performers lately, with the stock up 7.8% over the past month. The stock hit a new 52-week high of $61.76 in the previous session. Allison Transmission has gained 5.6% since the start of the year compared to the 22.4% move for the Zacks Auto-Tires-Trucks sector and the 0.8% return for the Zacks Automotive - Original Equipment industry.What's Driving the Outperformance?The stock has a great record of positive earnings surprises, as it hasn't missed our ...