GMC Sierra 3500HD trim comparison
2024 GMC Sierra 3500HD AT4 vs Denali Ultimate
The Sierra 3500HD AT4 starts at $70,300 while the Denali Ultimate is $95,300. That $25,000 gap buys 5 meaningful differences.
This trim jump changes the engine from 6.6L V8 to 6.6L V8 diesel Turbo. Everything else is secondary to whether that powertrain difference matters for how you drive.
Start with the AT4 if the 6.6L V8 already feels sufficient for the way you drive. Step up to the Denali Ultimate only when the 6.6L V8 diesel Turbo powertrain is the reason you are moving higher in the lineup.
If you are budgeting this move monthly, the jump from the AT4 to the Denali Ultimate is about $440/month on a 60-month loan at 6.5% APR with 10% down. That works out to roughly $26,400 more by the time interest is counted. The payment only makes sense if that different powertrain matters to the way you actually drive, tow, or live with the vehicle.
Lock one trim, change the other side, and move through exact pair pages without resetting back to the full lineup every time.
Who notices the difference
The higher trim starts to make more sense when you tow, haul, or merge with enough load that the stronger powertrain matters.
When both feel the same
Both the AT4 and Denali Ultimate share the same 10-speed shiftable automatic transmission and Crew Cab cabin and bed dimensions.
The upgrade math
You are paying $25,000 for 4 measurable differences, which works out to about $6,250 per change.
Key Differences at a Glance
This is the fast read: price, power, efficiency, and the feature flips most likely to change the answer.
Every Difference, Side by Side
This is the full read behind the quick decision signals above: the complete hardware, comfort, and equipment story. 5 specification differences, 1 shared.
Full Specification Comparison
Specifications reflect available data as of early 2024. Confirm details with an authorized dealer before purchasing.
| Spec | AT4 | Denali Ultimate |
|---|---|---|
| Pricing | ||
| MSRP | $70,300 | $95,300 |
| Powertrain | ||
| Engine | 6.6L V8 | 6.6L V8 diesel Turbo |
| Horsepower | 401 hp | 470 hp |
| Torque | 464 lb-ft | 975 lb-ft |
| Transmission | 10-speed shiftable automatic | 10-speed shiftable automatic |
| Drivetrain | 4WD | 4WD |
| Fuel Economy | ||
| Fuel Tank | 36.0 gal | 36.0 gal |
| Dimensions | ||
| Curb Weight | 7,517 lbs | 8,333 lbs |
| Wheelbase | 159.0" | 159.0" |
| Length | 250.8" | 250.8" |
| Width | 81.9" | 81.9" |
| Height | 81.2" | 81.2" |
| Truck Specs | ||
| Cab Type | Crew Cab | Crew Cab |
| Warranty | ||
| Bumper-to-Bumper | 3yr/36k | 3yr/36k |
| Powertrain | 5yr/60k | 5yr/60k |
| Corrosion | 6yr/100k | 6yr/100k |
| Roadside Assistance | 5yr/60k | 5yr/60k |
Data sources: licensed third-party automotive data, EPA fueleconomy.gov, NHTSA, and official manufacturer materials. Values marked est. are estimated.
2024 GMC Sierra 3500HD AT4 vs Denali Ultimate Questions Shoppers Ask
Use this page for the direct trim answer, then zoom back out to the GMC Sierra 3500HD lineup, the GMC brand hub, the Full-Size Trucks, the how to pick a trim guide, or our mid-trim value research when you need the bigger shopping path behind this one matchup.
How much more does the 2024 Sierra 3500HD Denali Ultimate cost than the AT4?
The Denali Ultimate starts at $95,300 compared to $70,300 for the AT4 (both Crew Cab 4WD). That is a $25,000 difference, or approximately $440/month more on a 60-month loan.
Do the 2024 GMC Sierra 3500HD AT4 and Denali Ultimate have the same engine?
No. The AT4 uses a 6.6L V8 (401 hp, 464 lb-ft), while the Denali Ultimate has the 6.6L V8 diesel Turbo (470 hp, 975 lb-ft). That is 69 more horsepower. Both pair with the same 10-speed shiftable automatic.
Do the 2024 Sierra 3500HD AT4 and Denali Ultimate have the same drivetrain?
Yes. Both come with 4WD as standard. The differences between these trims are in features and equipment, not drivetrain.
What warranty does the 2024 GMC Sierra 3500HD come with?
All 2024 GMC Sierra 3500HD trims, including both the AT4 and Denali Ultimate, come with GMC's standard warranty: 3yr/36k bumper-to-bumper and 5yr/60k powertrain coverage. Warranty does not vary by trim level.
Is the 2024 GMC Sierra 3500HD Denali Ultimate worth $25,000 more than the AT4?
The $25,000 buys the 6.6L V8 diesel Turbo. If that powertrain matters for how you drive, yes. If not, the AT4 does the same job for less.
The Full Story Behind This Price Gap
Use the direct answer above for this exact matchup, then use these guides to understand whether you are really looking at a feature step-up, a package shuffle, or the point where the lineup starts changing in a meaningful way.
What $25,000 Gets You
The Sierra 3500HD Denali Ultimate costs $25,000 more than the AT4. Whether that is worth it depends on how much you value the 6.6L V8 diesel Turbo engine (+69 hp). Power and comfort matter differently to different buyers. Weigh them against your priorities.
AT4 vs. Denali Ultimate: Day-to-Day
The Denali Ultimate runs a 6.6L V8 diesel Turbo instead of the AT4's 6.6L V8. That means 69 more horsepower and 511 more lb-ft of torque. You will feel the difference towing, merging, and passing on the highway.
Summary
$25,000 more for the Sierra 3500HD Denali Ultimate gets you 4 real differences. At $440/month more, the question is whether those specific changes are things you will use regularly.
Trim-Matched Accessories
These add-ons are split by trim intent so the recommendations follow the actual use case, not just the same repeated product block.
GMC Sierra 3500HD AT4
Value-trim add-onsThese picks fit the AT4 best when the goal is covering the daily-use gaps without paying up to the next trim.
GMC Sierra 3500HD Denali Ultimate
Step-up trim add-onsThese picks suit the Denali Ultimate when you want the accessories to match the nicer cabin, broader utility, or more premium use case.
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Specifications shown combine licensed third-party automotive data with official manufacturer, EPA, and NHTSA source material for the 2024 model year. Actual pricing, features, and availability may vary by region and dealer. Always confirm details with an authorized dealer before making a purchase decision. TrimAtlas is not affiliated with GMC or any dealership.
Page updated 2026-03-18. Verify equipment, pricing, and regional availability with the manufacturer or dealer.