Why Is GM Ending Silverado HD Class 4 to 6 Production in 2026?
I explain why GM is ending Chevrolet Silverado 4500HD, 5500HD, and 6500HD production by September 30, 2026, including the end of the Navistar partnership, plummeting sales, and the sale of the Springfield, Ohio plant.
Quick Answer
General Motors is ending production of the Chevrolet Silverado 4500HD, 5500HD, and 6500HD medium duty trucks by September 30, 2026. The decision ends an eleven year joint manufacturing deal with Navistar (now International Motors), which built the trucks at the Springfield, Ohio plant.
The reasons are simple: sales of the Silverado MD line fell 37.4 percent year over year in Q1 2026, the Springfield plant has been sold to Canadian armored vehicle maker Roshel, and GM\u2019s commercial focus is shifting to the Isuzu sourced Low Cab Forward (LCF) lineup for the 2027 model year.
The End of the GM and International Motors Partnership
Unlike the in house Silverado 2500HD and 3500HD pickups, the larger Class 4 through Class 6 medium duty trucks were the product of a joint manufacturing agreement signed in 2015 between GM and Navistar, now operating as International Motors.
Under the deal:
- GM supplied the cabs, interiors, and the 6.6L Duramax turbodiesel V8 engines.
- International Motors supplied the heavy duty rolling chassis and ran final assembly at its plant in Springfield, Ohio.
The trucks were sold as the Chevrolet Silverado MD at Chevy dealerships and as the International CV Series at International dealerships. In early May 2026, GM confirmed that it would not renew the contract. The final Chevrolet Silverado 4500HD to 6500HD models will roll off the Springfield line on September 30, 2026. International ceases its own CV Series production slightly earlier, on September 10, 2026.
Dissecting the Departing Silverado MD Lineup
Losing the 4500HD, 5500HD, and 6500HD removes a highly capable set of tools from the American workforce. These trucks were built for serious commercial applications, frequently upfitted as tow trucks, dump trucks, utility bucket trucks, and large flatbeds.
Key Specifications
- Powertrain. A commercial grade 6.6L Duramax turbodiesel V8 tuned for continuous heavy duty work, rated at 350 hp and 750 lb-ft of torque.
- Transmission. A true commercial Allison six speed automatic, not the consumer 10 speed used in the pickups.
- Weight ratings. The 4500HD offered GVWRs between 14,001 and 16,500 lbs. The 6500HD could be rated up to 23,500 lbs.
Why GM Is Walking Away
Why end a highly capable lineup? The answer is a mix of economics, factory logistics, and fierce segment competition.
1. Plummeting Sales Numbers
The Silverado MD line never seriously dented Ford\u2019s grip on the segment with the F-450, F-550, and F-650 chassis cabs. The sales numbers tell the story. GM sold roughly 8,341 Silverado MD units in 2025. In Q1 2026, sales fell 37.4 percent year over year to only 1,273 units. Running a dedicated joint manufacturing line for that volume is no longer financially viable.
2. The Sale of the Springfield Plant
At the same time, International decided to sell the Springfield facility. On March 30, 2026, the plant was acquired by Roshel, a Canadian defense contractor that specializes in armored vehicles. Roshel plans to use the experienced workforce to build commercial and law enforcement vehicles, which effectively ends the plant\u2019s ability to build Chevrolet trucks.
What Is Next for Chevrolet Commercial Trucks
While the conventional cab Silverado MD is going away, GM is not abandoning the medium duty commercial space.
After the September 30 shutdown, Chevrolet will shift its medium duty focus to the Low Cab Forward (LCF) lineup. The LCF trucks use the flat cab over engine design favored in urban delivery, and they come out of a separate, successful partnership with Isuzu.
For the 2027 model year, fleet buyers can still order the Chevrolet LCF 3500, 4500, 5500, 6500XD, and 7500XD. These are essentially rebadged Isuzu N Series and F Series trucks. They offer wheelbases up to 248 inches, can handle 30 foot cargo boxes, and reach GVWRs above 33,000 lbs.
GM also confirmed that it will keep producing the bulk of its Chevrolet Express and GMC Savana cutaway vans at its Wentzville, Missouri plant. Those vans remain a backbone of the upfit market.
What This Means for Fleet Buyers
If you operate a fleet of Silverado MD trucks today, three practical implications matter most.
- Parts and service. GM is contractually required to support parts and warranty for years after the last truck is built. Maintenance is not going away overnight.
- Resale values. Discontinued conventional cab medium duty trucks with the Duramax and Allison combo are likely to hold their value well, especially clean, low mileage examples.
- Replacement planning. If your operation needs a conventional cab, plan to migrate toward the Ford F-Series chassis cabs or the Ram chassis cab program. If your work is mostly urban delivery, the Chevrolet LCF is a clean continuation path.
Frequently Asked Questions
When does GM stop building the Silverado 4500HD, 5500HD, and 6500HD?
The last Chevrolet Silverado MD trucks roll off the Springfield, Ohio line on September 30, 2026.
Is GM ending all heavy duty Chevrolet trucks?
No. The Silverado 2500HD and 3500HD pickups continue. Only the conventional cab Class 4 through 6 medium duty trucks are ending.
Will Chevrolet still sell medium duty trucks after 2026?
Yes. The Isuzu sourced Chevrolet LCF lineup continues for the 2027 model year and beyond.
Who bought the Springfield, Ohio plant?
Roshel, a Canadian armored vehicle maker, acquired the facility on March 30, 2026.