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GM Unveils 2027 Silverado HD, Sierra HD With 555hp Diesel

By Drooid · Sep 25, 2026, 4:06 PM UTC · How we work

Summary

Story summary

General Motors unveiled refreshed 2027 Chevrolet Silverado HD and GMC Sierra HD trucks.
The trucks feature a new 8.3-liter V8 diesel “Mongoose” engine delivering 555 hp and 1,230 lb-ft torque.
Maximum conventional-hitch towing capacity rises to 20,000 lb, while gooseneck capacity reaches 38,000 lb.
They introduce a first-in-segment electronic brake-boost system with 14.6-inch front rotors and four-piston calipers.
GM says the 2027 Silverado HD and Sierra HD will arrive by year-end, pricing later.

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Story summary

General Motors unveiled refreshed 2027 Chevrolet Silverado HD and GMC Sierra HD trucks.
The trucks feature a new 8.3-liter V8 diesel “Mongoose” engine delivering 555 hp and 1,230 lb-ft torque.
Maximum conventional-hitch towing capacity rises to 20,000 lb, while gooseneck capacity reaches 38,000 lb.
They introduce a first-in-segment electronic brake-boost system with 14.6-inch front rotors and four-piston calipers.
GM says the 2027 Silverado HD and Sierra HD will arrive by year-end, pricing later.