General Motors put out a press release this week about paint booths, assembly lines, and square footage. Read past the numbers, though, and it isn’t really a manufacturing update. It’s a confession about which vehicles GM has decided are worth defending for the rest of this decade, and every one of them burns gasoline.
On July 24, GM announced two investments totaling more than $430 million: roughly $157 million at Wentzville Assembly in Missouri and $275 million across the Spring Hill manufacturing complex in Tennessee. Mike Trevorrow, GM’s senior vice president of global manufacturing, framed it as proof the company is “building flexible, long-term manufacturing sites” for whatever comes next. Look at what that money actually funds, and the long-term part gets a lot more specific than Trevorrow let on.
Start with Wentzville, because it’s the more revealing of the two. The $157 million there isn’t going toward a new model or a redesigned platform. It’s going into the paint shop: new processing equipment, a roughly 28,000-square-foot expansion, and a full refurbishment of the existing building.
Wait, really? A paint shop upgrade sounds like the least interesting line item in the entire release. It isn’t. Paint operations are routinely the most expensive and heavily regulated department inside an assembly plant, more so than the body shop or general assembly in plenty of cases. They fall under the EPA’s Clean Air Act rules for surface coating, which cap how much volatile organic compound and hazardous air pollutant a plant can release. Rebuilding one isn’t cosmetic. It’s a multi-year commitment to keep a facility legally allowed to run at modern volumes.
Wentzville builds the Chevrolet Colorado, GMC Canyon, Chevrolet Express and GMC Savana, and employs more than 4,000 people. The Colorado and Canyon were just redesigned for 2023, so this isn’t tooling for a new truck. It’s a bet on quality and longevity for vehicles that already exist, which matters more than it sounds given that Chevrolet Colorado owners built at this very plant just filed a class-action lawsuit over a completely different mechanical issue.
Here’s the second wait-really moment, and it’s the one most casual truck shoppers miss entirely. The Express and Savana ride on an architecture that traces back to the mid-1990s. Ford and Ram have both moved their vans to more modern unibody or import-derived platforms. GM never bothered, because fleet buyers, ambulance upfitters and shuttle-bus builders keep ordering the old body-on-frame design anyway. Spending real money on the paint shop that finishes those vans is GM quietly telling commercial customers the Express and Savana aren’t disappearing soon, even with no next-generation replacement on the drawing board.
Now Spring Hill, which is the half of this story The Auto Wire already saw coming. Of the $275 million earmarked there, $150 million supports assembly of the revived Cadillac XT6, and $125 million backs GM’s powertrain operation on the same complex, which builds the 2.7-liter turbocharged engine. Once the XT6 arrives, Spring Hill becomes a five-vehicle plant.
That’s notable because Spring Hill also builds the Cadillac Lyriq, the electric SUV GM once used to prove Cadillac could go toe to toe with Tesla. This new money doesn’t expand electric capacity at that plant. It funds a gasoline SUV and a turbocharged four-cylinder program on the same site. We’ve already covered why that shift happened: GM has logged billions in EV-related charges over the past year, and Cadillac’s plan to sell nothing but electric vehicles by 2030 is no longer the plan.
Add up both plants and a pattern shows up that the press release never states outright. None of the $430 million creates new electric vehicle capacity. It reinforces a decades-old van platform, a midsize truck that already exists, a revived gasoline SUV, and a turbocharged engine program. That’s what GM’s manufacturing dollars are actually defending this year, even as the company keeps describing itself, in public, as an EV leader.
There’s a reason this is showing up in paint shops and engine plants instead of keynote slides. A new model announcement tells you what a company hopes to sell. A paint shop expansion tells you what it’s already decided to keep.
What’s worth remembering a year from now isn’t the square footage in Missouri or the model count in Tennessee. It’s that GM’s actual 2026 manufacturing budget reads like a company hedging hard on combustion engines, one plant investment at a time, no matter what the keynote slides say.