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Byline: David Kennedy Classified drivetrains and last-minute fork swaps as Rob Britton and Jordan Schleck ride custom Factors at Unbound 2024 There's a widely agreed-upon saying that goes something along [...]

Byline: David Kennedy Three Felt gravel bikes, three wildly different setups for Johnson, Niki Terpstra and Dani Shrosbree Among the veteran riders of the elite fields at the Unbound Gravel, [...]

Byline: David Kennedy We check out Amity Rockwell and Nathan Haas' Colnago G4-X gravel bikes Unbound Gravel 2024 earned its spot at the pinnacle of the gravel race calendar due [...]

When it comes to making power with a diesel, we judge an engine's performance potential by its ability to handle boost, cylinder pressure, and rpm. Though the Duramax (and even [...]

The Boeing B-52 Stratofortress bomber was designed in the late '40s and put into service in 1952. When conceived, it was designed to carry nuclear weapons and intended to play [...]

At the beginning of every August, diesel owners from all over the West flock to Denver, Colorado, for ATS Diesel's three-day Diesels on the Mountain event. The action begins with [...]

Theodore Alfred (T.A.) Peterman and John Deere (the men) never crossed paths, but clearly these two American innovators were cut from the same precision cloth. The companies that went on [...]

POWER. IT'S WHAT ALL DIESEL ENTHUSIASTS WANT. Power to tow, power to haul, and power to outrun every other truck at the stoplight or highway on ramp. But power isn't [...]

The '03y2 to '07 6.0L PowerStroke engines (which were also used in E-Series vans until '09) have terrible reputations for reliability and repair costs among diesel enthusiasts. You've no doubt [...]

THIS IS A GREAT TIME TO BE A DIESEL TRUCK BUYER. BUT IT'S AN EXTREMELY DIFFICULT TIME TO BE a Diesel Power judge trying to name the best diesel pickup [...]

We're building our '97 Ford F-250 regular cab into a snowplow truck that we've begun referring to as 'Mr. Plow' around the office. While this truck will never make more [...]

DIESEL POWER 15 BASED IN L05 ANGELES AND HAS a satellite office in Illinois. During the last five years, we've attended events all over the country, but we've never made [...]

TORTURE-TESTING DIESELS IN DENVER DENVER, COLORADO, IS LOCATED AT 5,280 feet above sea level--which makes it a natural home for turbodiesel trucks. Add in the fact that it's also home [...]

TEN YEARS AGO, NOBODY KNEW WHAT A 6.6L DURAMAX engine was. We couldn't tell how they worked, how long they would last, or the power output they'd be capable of [...]

Diesel engines are at their best when the conditions they have to perform in are at their worst. They thrive on hard work, heavy loads, and continuous use--so it's no [...]

THE AMERICAN AUTO INDUSTRY HAS BEEN AT WAR-FIGHTING FOR ITS VERY SURVIVAL. OF THE BIG THREE, Ford's battle plan has been by far the most comprehensive. It's managed to engineer [...]

GENERAL MOTORS' NEW '11 SILVERADO 3/4- AND 1-TON TRUCKS REPRESENT THE biggest change in the pickup's architecture since the '01 model year. If you're into diesels for their appearance and [...]

EVERY YEAR IN LAS VEGAS, NEVADA, THE AUTOMOTIVE industry gathers for what is perhaps the greatest car show on earth. There are thousands of vehicles from all over the world, [...]

IN 2008, THE UTAH DEPARTMENT OF TRANSPORTATION decided to conduct an experiment. It chose to raise the daytime speed limit on selected parts of I-15 to 80 mph. Sound crazy, [...]

AND THE WINNER IS ... NOT WHO YOU'D THINK! If every car dealership in the country had an off-road test track, you wouldn't have to read this story. If every [...]

It's been 25 years since Ford put a solid axle under the front of anything but a 1-ton truck--and man, has it come a long way! Traditionally General Motors is [...]

Half of the questions we get here at the magazine are from readers who want to know what they have, and how good it is. When it comes to axles, [...]

Come on, you've all imagined yourselves doing something like this. Hooking your turbodiesel-powered 4X4 up to something no one else in town could move, dropping the transmission into gear, and [...]

A little back-story is in order. In the June '04 issue we swapped a Gen III 6.0L engine from Turnkey Engine Supply into our '82 Blazer ('6.0L engine Swap'). For [...]

You're reading Petersen's 4-Wheel & Off-Road magazine, so you don't care about some station wagon SUV-clone that claims to offer personal freedom and adventure on the way to the 99-cent [...]

WHEN IT COMES TO AXLE MANU-facturers, almost everyone is familiar with the Dana Spicer name. If you're reading this magazine, chances are good that you've seen axles with names like [...]

FORGET EVERTHING YOU KNOW about gasoline engines. Very little of it applies when you are dealing with these hopped-up torque-generating diesel monsters. Unlike gasoline engines, which have been maximized on [...]

WE'RE ABOUT TO LET YOU IN ON AN UNFAIR advantage. After years of running our four-wheel-drive diesel trucks around on the same tires during all four seasons, we've finally discovered [...]

Our Silverado 3500 used to eat tires. It didn't matter what tire pressure we ran, which brand of tire we used, or how often we rotated them. Tires just died [...]

The best thing about owning a four-door diesel truck is that it can do anything. Want to tow your boat, haul some lumber, or race your buddy's Mustang? No problem. [...]

THE BIGGEST HEARTBREAK IN DIESEL HISTORY PLAYED OUT LAST YEAR WITH THE NEWS of Ford's, Dodge's, and GM's decision to postpone their 1/2-ton diesel engine programs indefinitely. It literally broke [...]

It seems ironic that 10 years ago, diesels required almost no electricity, yet wouldn't exist today without computer controls. While some traditionalists may long for the days of mechanical injection, [...]

MIKE COPELAND'S S-10 ZR2 DRAWS A TON OF ATTENtion, and not just from S-10 guys. It's the kind of truck that people see in action on the sand dunes of [...]

WITH THE NEW 5.7L HEMI ENGINE on the horizon packing 345 hp and 365 lb-ft, the original 8-year-old 360ci Chrysler small-block is looking a little lacking with 245 hp and [...]

ASK THE 4WOR STAFF WHAT OUR favorite Jeeps of all time are and you better plan to find a comfortable seat while we list just about every Willys, Kaiser, AMC, [...]

NEARLY ALL OF THE original equipment vehicle manufacturers produce concept vehicles. Most of these vehicles arc strictly show cars that can barely be driven on a closed-course. The gauges are [...]

Your engine's manifold absolute pressure (MAP) sensor is your little buddy. Buried somewhere in the stream of your charged intake air (usually in the manifold), it employs a little ceramic [...]

IF THERE'S ONE THING THAT SETS OUR DIESEL trucks apart from all the other pickups on the road, it's the loads they experience. It's not just that our diesel engines, [...]

There's a fear in the air right now. Ammunition sales are on the rise, Americans are concerned about a double-dip recession, and there's earthquake activity, talk of global warming, eyewitness [...]

From 1982 to 2000, General Motors offered 6.2L and then 6.5L indirect-injection diesel engines in every full-size truck it built. The engine was so widely used, it even made it [...]

PHOTOS COURTESY OF FORD AND GM IF YOU AREN'T OLD ENOUGH TO HAVE LIVED THROUGH THE muscle car era of the '60s--fear not. You can stop dreaming about the good [...]

The Pit Bull Rocker XOR-LT radial is an extreme tire in every sense of the word. It's the exact opposite of a drag racing slick, but it's just as purpose [...]

People who use their diesels to make money have different expectations for the upgrades they buy. When it comes to tires, they need something that will run smooth, wear like [...]

The Trail Grappler is Nitto's latest off-road tire for a segment it already sells four other tires in. So why offer a new tire? Strategically speaking, the Trail Grappler is [...]

Over the last few years, the diesel quest for low-end torque seems to have been replaced by the bragging rights of quadruple-digit horsepower. While big power numbers are fine for [...]

It's ironic how much engineering has to go into a product in order for it to work in the dirt. Off-road performance is a whole other world from street performance. [...]

I have a '99 Jeep Cherokee. It has a 4-inch suspension lift and a small set of 30X9.50-15 Dueler AT Revo tires. I have run into a few problems with [...]

I would like to convert my two-wheel-drive Dodge Dakota pickup to four-wheel drive. I have a fabrication shop at my disposal. Would it be better to use leaf springs or [...]