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When Ford unveiled the 2017 Super Duty lineup last fall, the Single Cab Dually variant was mysteriously absent.  However, spy photographers have just snapped photos of an F-350 XLT Single Cab Dually undergoing testing in Michigan.

Set to go on sale later this year, the truck has a familiar design that closely echoes its four-door counterpart.  The only noticeable changes are the elimination of the rear doors and the addition of extended fender flares to accommodate the dually setup.

The interior will be heavily influenced by the F-150 so drivers can expect a higher quality cabin with a variety of high-tech options including a SYNC 3 infotainment system with an 8-inch display.

Like the rest of the Super Duty lineup, the Single Cab Dually variant will have a "high-strength, military-grade, aluminum alloy" body which is lighter and more dent-resistant than the previous steel body.  The truck will also have an all-new frame which uses more high-strength steel than its predecessor.  Thanks to these changes, the truck will weigh hundreds of pound less than the outgoing model.

Under the hood, customers can expect a variety of different engines including a 6.2- and 6.8-liter V8 petrol engine.  However, many customers will likely opt for the 6.7-liter Power Stroke Diesel V8 engine which produces 330 horsepower and 750 pound-feet of torque.

Gallery: 2017 Ford F350 XLT Single Cab Dually spy photos

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