2027 GMC Sierra HD Pricing: Diesel AT4X Hits $100,595

GMC priced the 2027 Sierra 2500 HD Crew Cab 4WD on October 6, 2026: Pro through AT4X each climb $900, Denali Ultimate (diesel-only) jumps $2,400 to $99,395, and the new 8.3L Duramax is an $11,400 option — enough to push an AT4X diesel to $100,595.

These figures cover 2500HD Crew Cab 4WD only. Rear-wheel-drive, Regular/Double cab, and 3500HD stickers were not in the material we saw. GMC did not specify destination in the figures we saw — we are not adding Chevrolet’s destination charge to these MSRPs, and we are not guessing whether freight is already baked in.

Sources

• General Motors — 2027 HD Duramax 8.3L powertrain release (September 24, 2026) — 555 hp / 1,230 lb-ft; gas 6.6L 412 hp / 472 lb-ft; up to 20,000 lb conventional / 38,000 lb gooseneck; up to 46,500 lb GCWR
• Pickup Truck Talk — 2027 GMC Sierra HD diesel price (October 6, 2026) — GMC-supplied Crew Cab 4WD MSRPs, $11,400 diesel option (2026 GMC diesel $9,990), destination treatment not specified
• Off-Road.com — 2027 Sierra HD diesel pricing (October 2026) — same ladder; destination left unclear in GMC material
• TFL Truck — 2027 GMC Sierra HD pricing (October 6, 2026) — Crew Cab 4WD trim walk; Denali Ultimate diesel-only; $11,400 option
• TruckDaily — 2027 Chevy Silverado HD pricing — sister Chevrolet 2500 HD MSRP ladder and destination treatment

TruckDaily take

Who this is for. Sierra 2500 HD shoppers locked on Crew Cab 4WD who want GMC’s trim stack — especially AT4 / AT4X off-road buyers and Denali buyers who will pay for the diesel. The $100,595 AT4X diesel is the headline; Denali Ultimate at $99,395 is diesel-only and sits just under that sticker.

Who should skip. Skip if you need 2WD, a Regular or Double cab, or a 3500HD — those prices were not published here. Skip treating any row as an as-delivered number until a dealer worksheet shows destination clearly. Skip the diesel if the gas 6.6L’s published 412 hp / 472 lb-ft covers the trailer you pull.

What we’d buy. For a diesel work-luxury Crew 4WD, we’d price Denali + 8.3L ($78,895 + $11,400 = $90,295 on the supplied gas/diesel columns) before we chase AT4X past $100K — unless the DSSV / Terrain Mode hardware is the reason you want the truck. Cross-check the Chevrolet sister sheet if you are trim-shopping both badges: 2027 Silverado HD pricing.

2027 Sierra 2500 HD Crew Cab 4WD MSRP ladder

Figures from GMC’s October 6, 2026 pricing information as reported by Pickup Truck Talk, Off-Road.com, and TFL — 2500HD Crew Cab 4WD only. Diesel column = gas MSRP + $11,400 option, except Denali Ultimate, which is diesel-only at the published sticker. Destination: GMC did not specify destination in the figures we saw. Bed configuration behind each figure was also not spelled out in that material.

Diesel option and year-over-year math

Pickup Truck Talk keeps Chevrolet’s outgoing diesel figure ($9,900) separate from GMC’s ($9,990). We do the same. Do not mix the two brand sheets into one “GM diesel adder” number.

Power and tow that are published

Same GM September 24 HD release covers Sierra: available 8.3L Duramax at 555 hp / 1,230 lb-ft, enhanced 6.6L gas at 412 hp / 472 lb-ft, up to 20,000 lb conventional / 38,000 lb gooseneck on properly equipped models, up to 46,500 lb GCWR. Per-trim tow and payload for these 2027 Sierra rows are Not published in the pricing material.

GMC’s pricing notes also point at electric power steering, eBoost braking, larger front rotors, larger DSSV dampers on AT4X, and Terrain Mode — hardware claims from the brand, not a TruckDaily drive.

Ford diesel option comparison (verified only)

GMC’s $11,400 Duramax option sits under the $12,495 High Output 6.7 Power Stroke option line on 2027 Ford Super Duty F-250 / F-350 window stickers we checked. Engine-option dollars only. A Ram Cummins option price is not printed here — we could not lock it to a Ram OEM primary.

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