Transmission & Drivetrain

There’s an interesting thing about early Chevrolet Silverado and GMC Sierra trucks equipped with the Duramax diesel engine and Allison transmission. From 2001–2005, these trucks were equipped with a five-speed Allison automatic transmission. In 2006, the trucks received a big update, a “new” six-speed Allison transmission. The interesting discovery came after the new transmission was

When we started our 2002 Chevrolet Silverado 2500 Duramax project a couple years ago, we set out with a few goals in mind. We wanted the truck to be reliable, first and foremost. We also wanted to put between 650 and 700 hp to the rear wheels, and we wanted the truck to ride on

Most people don’t think about replacing the U-joints on their truck until they hear the telltale whine. That’s exactly what happened to us and Project Over/Under recently. With the truck basically complete, we’ve mostly been enjoying it, but we’ve also done a little fine-tuning. We changed out the exhaust—our former kit was rubbing in a

With every project—especially older ones like our ’71 Chevrolet C10 Suburban—there are issues that can and will come up when you begin to tear into it. Last month, we brought you a second helping of tech on our ’71 Suburban, consisting of a Baer brakes install to go along with the QA1 coilover conversion and

In Part Two in a series Author talks about how and why to install the correct gear ratio for oversized tires on a ’01 Ford F-250.