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GMC's Bronco-slaying SUV will remain a dream, report says

GMC won't help rival Ford in its quest to dethrone the Jeep Wrangler, according to a recent report. The body-on-frame off-roader the firm planned as an alternative to the upcoming Bronco and the fourth-generation Wrangler allegedly fell victim to a top-down restructuring plan implemented recently by parent company General Motors. Citing anonymous inside sources, Muscle Car & Trucks reported the rugged SUV remained part of GMC's long-term product plan until November 2018. It was shaping up to be one of the company's most distinctive models in decades. It should have arrived as a dedicated off-roader developed and sold exclusively by GMC; it wouldn't have had a twin in the Chevrolet portfolio. The problem, according to the report, is that the off-roader (which might have revived the heritage-laced Jimmy nameplate) should have been built on the 32XX platform designed to underpin the next Chevrolet Colorado/GMC Canyon twins. General Motors canceled that project to save money, so the SUV was consigned to the attic before we even spotted prototypes testing on and off the pavement. The updated pickups will instead arrive on an evolution of the frame found under the models currently found in showroom. There's no word on why that architecture can't support a Wrangler-like SUV. GMC never confirmed plans to build an off-roader aimed at the Jeep Wrangler and the upcoming Ford Bronco, so it certainly won't validate reports claiming it has canceled the model. This isn't the first time we've heard about a body-on-frame SUV made by a brand in the General Motors portfolio, though. Hummer was supposed to take the fight directly to Jeep with an off-roader accurately previewed by the 2008 HX concept, but it shut down before it finished developing the model. Rumors of GMC picking up where Hummer left off have come and gone on a shockingly regular basis over the past few years, yet the Wrangler remains in a class of one.

Junkyard Gem: 1990 GMC S-15 Jimmy 4x4

The General sold the GMC-badged version of the first-generation Chevy S-10 Blazer, known as the S-15 Jimmy or just the Jimmy, from the 1982 through 1994 model years. These trucks were based on the small S-10 pickup and sold well (until small trucks were forced to get bigger and less truck-like after the dawn of the Ford Explorer-inspired commuter-truck era), but they have become difficult to find in vehicle graveyards in our current century. Here's a '90 Jimmy 4x4 with red-primer paint job, found in a self-service yard on California's Central Coast last month. GMC shoppers could get the 1990 Jimmy as a rear-wheel-drive truck, but this one has the four-wheel-drive option that allowed Tahoe-bound skiers to skip the chain monkeys on the way to the slopes (the CHP, understanding that California drivers have a 95% mortality rate on snow or ice, requires chains or four-wheel-drive to get over Donner Pass when there's a hint of snow forecast). GM sold so many millions of small-block Chevrolet V8s that it made economic sense to use the same tooling to produce a V6 version. The result was this truck's 4.3-liter V6 that was three-quarters of the good old Chevy 350 (5.7-liter) V8 that powered so many Camaros, Chevelles and Impalas. The 4.3 didn't make smooth power, but it got the job done and held together quite well. This one was rated at 160 horsepower, good enough for the Jimmy 4x4's 3,512-pound curb weight. These days, though, used-truck shoppers insist on at least two tons of heft plus four doors. Some discount lot in Monterey or Salinas couldn't even get $999 for this truck, and so it ended up in the final stop before the cold steel jaws of the crusher. 1990 was the last model year for the two-door-only Jimmy; for 1991, the Jimmy came with a choice of two doors (for devil-may-care types) or four doors (for drop-the-kids-at-school types). I've always liked the look of the instrument panels on the early S-10s and its siblings; even though the designers had to work within strict budgetary limitations, they made the panels look interesting. This truck nearly made it to 170,000 miles before the end. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. So powerful with the 4.3 (the regular S-15 pickup still came with a 2.8-liter V6 as base equipment) that it could destroy a TV camera.

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).