Transmission & Drivetrain

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

As we’re nearing completion on our 2003 Chevy Silverado project, we have just a few more items to cover to make the truck function as good as it looks.

KJ Jones, Jason Gonderman – Authors, Photography Check Out These Other Stories! What Is Diesel Blow-By? What Is Cummins Killer Dowel Pin? What Is CP4 Injection-Pump Failure? Installing Sinister Diesel’s Cummins Steering Box Support As people of the world continue to adapt to a new way of life, we’ve noticed that pickup truck—especially diesel—enthusiasts are spending

Owners of four-wheel-drive General Motors pickups from 1997 to 2010 should all be aware of the dreaded “pump rub” issue. It doesn’t matter if you drive a Silverado 1500, Sierra 3500, or even an Avalanche, if your truck has a transfer case, this story is for you. In short, the pump rub issue refers to

It can be argued that there’s no bigger bang-for-the-buck performance upgrade than new axle gears. Auto manufacturers are tasked with building a vehicle that is optimized for both highway efficiency, comfort, and performance. Because of this, there’s going to be a trade-off of some sort. All too often, manufacturers lean toward efficiency over performance. Add

When we first rolled our 2002 Chevy Silverado 2500HD into the bay at PPE Diesel’s shop in Montclair, California, we thought for sure the transmission was toast. Interestingly, upon inspection it was actually in relatively good shape despite likely having more than 200,000 miles on a truck that was pushed hard enough to melt a

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