What happened

Allison Transmission (NYSE:ALSN) stock is trading up 10.1% as of 12:50 p.m. EDT, after the company reported second-quarter sales and earnings that quite simply beat Wall Street's expectations with a stick.

Allison reported $1.29 per share in profit on sales of $711 million, far more than the $1.00 in earnings on sales of only $652.4 million that analysts had expected.

Automatic-transmission gearshift

Allison Transmission is thriving in a world that's forgotten how to drive stick. Image source: Getty Images.

So what

Allison's quarterly sales surged 23% year over year, making for a record quarter, and earnings were up 83%.

Sales of "off-highway" automatic transmissions -- Allison's smallest business area -- were the hero of this quarter, surging 140% outside North America, and 520% within North America. However, sales were actually up across the board and in every reported business segment.

Even better, profit margin jumped 440 basis points to 34.9%.

Now what

These results gave Allison confidence enough to raise its guidance for the rest of this year. As of today, Allison anticipates ending 2018 with sales up 15% to 18% over last year (so, between $2.6 billion and $2.7 billion), and with net profit growing from 13% to 19% (from $570 million to $600 million).

At today's market capitalization of $6.4 billion, that values Allison stock at less than 11 times the top range of this year's guidance, and no more than 11.2 times the low end. Not bad for a stock that just turned in 83% earnings growth.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.