It wasn't long ago that Ford and Dodge diesel truck owners laughed at the 6.2- and 6.5L diesel guys. Historically, GM owners have always been competitive in performance contests despite the best ...

Last month, the most extensive modification to date was performed on our ’06 GMC Sierra 2500HD—fortifying the Allison transmission with Sun Coast parts. This month, we put the built Allison to work ...

A truck brand based around professional grade performance, the 2006 GMC Sierra 2500HD receives strengthened diesel power. The Duramax 6.6-liter turbocharged diesel engine is radically upgraded for ...

A truck brand based around professional grade performance, the 2006 GMC Sierra 2500HD receives strengthened diesel power. The Duramax 6.6-liter turbocharged diesel engine is radically upgraded for ...

General Motors' LBZ Duramax Engine is one of the most reliable engines ever built. Over the years, the LBZ and other Duramax engines have carved out a reputation for durability, reliability, and long ...

Ever wondered what happens when you rip off the cab and bed of a heavy-duty pickup truck? Well, you get one giant go-kart-looking thing with a massive engine. If you don’t believe us, just ask ...