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GM opens official investigation into C8 Corvette transmission leaks

In March 2020, a month after Chevrolet began customer deliveries of the 2020 C8 Corvette, a GM dealer technician created a Reddit thread about a leaking gearbox in a Corvette with 32 miles. That car hadn't even been sold yet. Since then, as a search of "C8 Corvette transmission leak" shows, it's been tales of woe for some owners. Something in the Tremec TR-9080 transaxle in the back of the mid-engined Corvette doesn't work as it should, the fault able to cause codes that the transmission needs service, or that the driver needs to shift to park. In some cases, the battery would die because of follow-on issues after the initial transmission code, that code preventing the car from powering down. As Autoevolution reports, GM filed paperwork with the National Highway Traffic Safety Administration in August to look into what's going on. Between forum threads and GM's investigation document, there are several issues mentioned. The most common appears to be the dual-clutch transmission leaking fluid due to gasket failures like the one suffered by one owner at 858 miles, and another for an owner currently enduring a second leaking transmission. The Midengined Corvette Forum reported that Chevy engineers redesigned the TR-9080 pan, fitting Corvettes with the new unit at some point in the 2021 model year. The original pan was stamped steel unit affixed to the engine with two studs and 13 bolts, plus "reinforcement plates." The updated pan is said to be a cast aluminum unit affixed with two studs and 17 bolts, omits the reinforcement plates, and gets a new machined new groove around its edge to seat the gasket seal. The GM paperwork now at the NHTSA mentions a P1789 code, and says one reason for it could be "debris on the park position sensor magnet causing an incorrect position reading to the TCM." This might be caused by another issue mentioned in forums, which is clogged transmission filters. GM gives instructions for returning transmission filters to the company, and a poster on one forum said the Corvette tech at the dealer where he bought his Corvette told him the automaker "requires every used transmission filter to be returned to GM."  Whatever's going on, the problems haven't stopped, and they go beyond the P1789 code. Over the weekend, a 2022 Corvette owner posted on Corvette Forums that he got a check engine light on his car after just 850 miles.

Elvis Presley owned this GMC pickup. Now you can, too

Befitting his status as America's first rock star, Elvis Presley lived large. Among his many excesses, Elvis was well known for his prolific new-car purchases. Mostly, it seems the King favored Cadillacs and Lincolns — although, during his Army stint in Europe, he picked up a BMW 507 roadster. Here we have something different from the Elvis Presley canon: a 1967 GMC pickup. And this GMC will be crossing the block at the GAA Classic Cars auction on February 27. This GMC is one of three that Elvis purchased from Guy Caldwell Motors in Senatobia, Mississippi, almost exactly 54 years ago: on February 7, 1967. He bought a red one, a blue one, and this green one for use on his Circle G Ranch in Horn Lake, Mississippi. According to a badge on the glovebox door, this pickup is a GMC Cheyenne Super, which sounds like a fancy-pants trim level, although the truck still looks pretty bare-bones to our eyes. The steel wheels have dog-dish hubcaps, and the grille and bumpers are painted white rather than chrome. It's a standard-bed half-ton pickup and is powered by a six-cylinder engine with a three-on-the-tree column-shift manual transmission. The truck spent just over a year on the ranch before being sold off. It then went through a series of owners and several museum stints. Among the paperwork included with a sale is a letter from Elvis Presley Enterprises confirming that a GMC pickup with this VIN number was bought new by Elvis. It has now been restored, so there shouldn't be a whole lotta shakin' going on. The truck has been repainted green, although the side mirrors are different than what's shown in a vintage photo, and the chrome trim along the sides is missing. More notably, we'd like to see the "Circle G Ranch" logo it once wore on its doors be added. No pre-sale estimate is given. The final hammer price for this GMC will depend on the degree to which bidders are all shook up at the prospect of owning one of the more unusual Elvis Presley vehicles.

2021 GMC Canyon gets AT4 trim and a 'more upmarket' Denali

The AT4 train continues at GMC, with the 2021 Canyon AT4 climbing to altitude in Vail, Colorado, to announce its arrival. The off-road package, teased during the Sierra HD launch last year and already rolled out on the Sierra and Acadia, replaces the Canyon All Terrain trim. The rectangular grille goes away, the new rig picking up a larger, Sierra-like grille with a dark chrome surround and vertically-oriented fog lights. And because nothing says off-road badass like red recovery hooks, of course there's a pair peeking out from under the tweaked lower bumper. Otherwise, all the All Terrain kit carries over, like the tuned suspension with Advanced Hill Descent Control, transfer case skid plate, automatic locking rear differential, and 31-inch Goodyear Wrangler DuraTrac® tires on 17-inch aluminum wheels. Inside, the headrests are embroidered with AT4 logos, and Kalahari stitching is exclusive to this trim. GMC also announced a more polished Denali trim, without providing any photos. The coming pickup adopts a grille with a "more sculpted and layered pattern," plus five-inch chrome assist steps, and 20-inch Diamond Cut aluminum wheels that we'll assume come in a different pattern than the current 20-inch Diamond Cut aluminum wheels. The cabin goes upscale with open-pore ash wood trim and aluminum trim, a new Cocoa/Dark Atmosphere color theme, and unique stitching. Both the AT4 and Denali offer the same two engine choices. There's either the 3.6-liter V6 throwing out 308 horsepower and 275 pound-feet of torque, shifting through an eight-speed automatic, or the 2.8-liter Duramax diesel producing 181 hp and 369 lb-ft, shifting through a six-speed auto. The 2021 trucks will be available later this year, pricing to be announced closer to the on-sale date. The 2020 Canyon All Terrain starts at $37,695, the 2020 Canyon Denali starts at $41,595. Featured Gallery 2021 GMC Canyon AT4 View 11 Photos Related Gallery 2021 GMC Canyon AT4 View 11 Photos GMC Truck Luxury Off-Road Vehicles