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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.

Mopar Hellephant is sold out, but here are 4 other awesome crate V8s to try

Despite a relatively enormous $30,000 price tag, Mopar's 1,000-horsepower supercharged Hellephant crate engine sold out in just 48 hours. Some enthusiasts may have missed out on the crazy engine due to lack of funds, or they just assumed there would still be some Hellephants down the line. But worry not, swap-happy gearheads. There are plenty of V8s in the world to pick from, and we highlighted four favorites. They're not as powerful, but they're all cheaper, and still have a lot to offer. Mopar 6.2L Hellcrate Odds are a lot of prospective Hellephant buyers were Mopar fans to begin with, so we'll start the list with the next-most-potent offering: the Hellcrate. This is the same supercharged 6.2-liter V8 found under the hood of the Dodge Charger and Challenger Hellcats and the Grand Cherokee Trackhawk. It makes 707 horsepower and 650 pound-feet of torque like those cars, too. It's also about $10,000 cheaper than the Hellephant engine at $20,020, and that leftover money can be used to finish the project or for aftermarket upgrades to get it closer to the Hellephant's output. GM LS9 6.2L The Hellcrate isn't the only factory supercharged crate engine on the market. From General Motors comes the supercharged 6.2-liter LS9 V8. This is the engine that was used in the C6 Corvette ZR1. At 638 horsepower and 604 pound-feet of torque, it doesn't make as much power or torque as the Hellcrate. But it does boast a dry sump oil system. So instead of pumping oil out of a pan at the bottom, the engine uses an oil tank mounted remotely that pumps oil into the engine. This means the engine is shorter overall, and can be mounted lower for a better center of gravity. It also means that there's almost no risk of running the engine dry in hard cornering, as could happen with a normal oil sump where the oil can slosh to the side without the oil pump. Basically, it offers some major benefits if you want supercharged V8 power for a road course car. It's also a tad cheaper than the Hellcrate at $18,149. But get one while you can, because GM is only selling what's left from when it was building the C6 ZR1. Ford Aluminator 5.2XS Our pick from the Blue Oval lacks a supercharger, but it's still pretty sweet.

Chevy Colorado and GMC Canyon get trim levels reworked again

GM Authority reports that GM has fiddled with trim packages on the Chevrolet Colorado and GMC Canyon for the 2021 model year, eliminating the base trims on both pickups and implementing small price changes. When the new model year goes on sale, the Chevy will lose the rear-wheel drive Base Extended Cab with the automatic transmission that starts at $22,395 after a $1,095 destination charge. The new entry-level is going to be the Work Truck model with the extended cab in rear-wheel drive, starting at $26,595 assuming the destination charge holds steady. That represents a $4,200 jump over the base 2020 model. MSRPs for the entire Work Truck lineup, from base to the Crew Cab Long Box, rise by $400. Elsewhere in the Colorado line, the four Z71 trims go down by $100, while the two ZR2 trims increase by the same amount. Only the six LT trims don't see any change.  The GMC side is a bit more involved due to previously announced changes. The 2020 Canyon comes in SL, Base Canyon, SLE, SLT, All Terrain, and Denali steps. Last month, GM Authority reported the 2021 Canyon would give all that up for the new names Elevation Standard, Elevation, AT4, and Denali. Since the SL base model retires in 2021, the Elevation Standard takes over at the entry level. Unlike on the Colorado, which sheds one trim, the Canyon lineup gets pared from 20 total combinations of trims, cab sizes, and bed lengths, to 14 total combinations. But like the Colorado, due to the loss of the cheapest configuration, the least expensive 2021 Canyon becomes $4,200 more expensive than in 2020, assuming the destination price remains the same. What's more, the 2021 Elevation Standard pricing adds $700 or $800 to the prices of the 2020 Canyon base and SLE models. There are more increases up the range. The 2021 Elevation trim replaces a combination of SLE and SLT models, bumping prices up by up to $900. In 2020, the least expensive All Terrain model is the Extended Cab Cloth for $37,695. For next year, the least expensive AT4 trim is the Crew Cab Short Box for $39,295. Like-for-like, though, the AT4 represents a $300 premium over the 2020 All Terrain Crew Cab Short Box. Three Denali trims will still stand at the top of the heap, each one going up by $400 in 2021. Until GM details the equipment changes, we won't know how the new pricing equates to value.