Chevrolet · Full-size heavy-duty pickup
Chevrolet Silverado 3500HD bed dimensions & sizes by year
Buying a tonneau cover and not sure it'll fit? Pick your model year to get the exact bed length of your Silverado 3500HD in inches — plus the covers built for it. No guesswork, no wrong-size returns.
Find your bed size in 10 seconds
The Chevrolet Silverado 3500HD has come in 4 bed lengths across 2005–2026:
Select your year above for the exact bed length that fits your truck.
Not sure which bed you have?
Two Silverado 3500HDs from the same year can have different beds depending on cab. Don't trust the badge — measure it. It takes 30 seconds and saves a return.
- 1
Close the tailgate.
- 2
Put a tape measure on the bed floor against the bulkhead (the wall behind the cab).
- 3
Measure straight back to the inside of the closed tailgate.
- 4
Match that number to a bed length above — covers are sold by category (5.5 ft, 6.5 ft, 8 ft…), so round to the nearest one.
Silverado 3500HD bed sizes & specs, year by year
Silverado 3500HD · T1 HD (New Body Style)
| Bed | Length | Inches | Cabs | |
|---|---|---|---|---|
| 6.9 ft | 6'10" | 82.25" | Double Cab, Crew Cab | Covers → |
| 8.2 ft | 8'2" | 98.27" | Regular Cab, Double Cab, Crew Cab | Covers → |
- Cab styles
- Regular Cab, Double Cab, Crew Cab
- Drivetrain
- RWD, 4WD
- Max towing
- 36,000 lb
- Max payload
- 7,442 lb
- MSRP from
- $47,595 (launch)
Engines (2)
- 6.6L L8T Gas V8 401 hp · 464 lb-ft · Gas
- 6.6L Duramax L5P Diesel 470 hp · 975 lb-ft · Diesel
SRW or DRW. Standard box grew to 82.25" (6'9"/6'10"/6.9 ft), not compatible with pre-2020 HD covers. Beds identical to 2500HD and across SRW/DRW. Duramax uprated to 470/975 in 2024. Max 36,000 lb gooseneck (DRW). 'Multi-Flex' tailgate optional.
Silverado 3500HD · K2XX HD
| Bed | Length | Inches | Cabs | |
|---|---|---|---|---|
| 6.5 ft | 6'6" | 78.9" | Crew Cab | Covers → |
| 8 ft | 8'2" | 97.8" | Regular Cab, Double Cab, Crew Cab | Covers → |
- Cab styles
- Regular Cab, Double Cab, Crew Cab
- Drivetrain
- RWD, 4WD
- Max towing
- 23,300 lb
- Max payload
- 7,374 lb
- MSRP from
- $38,120 (launch)
Engines (3)
- 6.0L Vortec V8 360 hp · 380 lb-ft · Gas
- 6.6L Duramax LML Diesel 397 hp · 765 lb-ft · Diesel
- 6.6L Duramax L5P Diesel 445 hp · 910 lb-ft · Diesel
SRW or DRW. Standard 6'6" box (78.9") is Crew Cab only. Beds identical to 2500HD - same cover fits 2500HD, 3500HD SRW and DRW. L5P replaced LML for MY2017.
Silverado 3500HD · GMT900 HD
| Bed | Length | Inches | Cabs | |
|---|---|---|---|---|
| 6.5 ft | 6'6" | 78.7" | Crew Cab | Covers → |
| 8 ft | 8'2" | 97.6" | Regular Cab, Extended Cab, Crew Cab | Covers → |
- Cab styles
- Regular Cab, Extended Cab, Crew Cab
- Drivetrain
- RWD, 4WD
- Max towing
- 23,200 lb
- Max payload
- 7,222 lb
- MSRP from
- $30,000 (launch)
Engines (3)
- 6.0L Vortec V8 360 hp · 380 lb-ft · Gas
- 6.6L Duramax LMM Diesel 365 hp · 660 lb-ft · Diesel
- 6.6L Duramax LML Diesel 397 hp · 765 lb-ft · Diesel
SRW or DRW. 3500HD skews to the 8' long box this era. Beds dimensionally identical to 2500HD - same cover SKUs. Dually does not change cover fit.
Silverado 3500HD · GMT800 HD (Classic)
| Bed | Length | Inches | Cabs | |
|---|---|---|---|---|
| 6.5 ft | 6'6" | 78.7" | Crew Cab | Covers → |
| 8 ft | 8'0" | 97.6" | Regular Cab, Extended Cab, Crew Cab | Covers → |
- Cab styles
- Regular Cab, Extended Cab, Crew Cab
- Drivetrain
- RWD, 4WD
- Max towing
- 16,700 lb
- Max payload
- 5,800 lb
- MSRP from
- $29,000 (launch)
Engines (3)
- 6.0L Vortec V8 360 hp · 380 lb-ft · Gas
- 8.1L Vortec V8 330 hp · 450 lb-ft · Gas
- 6.6L Duramax LBZ Diesel 360 hp · 650 lb-ft · Diesel
SRW or DRW (dually). Dually fender flares are outside the bed rails and do NOT affect tonneau fit - match by year-range + bed length only. Classic rail/mount differs from GMT900. Exact inches approximate (verify).
What fits in a Silverado 3500HD bed
Bed length in inches only means something once you know what it swallows. Here's how the loads people actually haul line up against every Silverado 3500HD bed on record.
| Load | Needs | 6.9 ft · 82.25" | 8.2 ft · 98.27" | 6.5 ft · 78.9" | 8 ft · 97.8" |
|---|---|---|---|---|---|
| 4×8 ft sheet of plywood or drywall | 96" | Tailgate down | Fits, tailgate up | Tailgate down | Fits, tailgate up |
| 8 ft 2×4s and trim lumber | 96" | Tailgate down | Fits, tailgate up | Tailgate down | Fits, tailgate up |
| Full-size dirt bike | 85" | Tailgate down | Fits, tailgate up | Tailgate down | Fits, tailgate up |
| Adult mountain bike, wheels on | 70" | Fits, tailgate up | Fits, tailgate up | Fits, tailgate up | Fits, tailgate up |
| Two-person truck bed tent | 60" | Fits, tailgate up | Fits, tailgate up | Fits, tailgate up | Fits, tailgate up |
| Standard 48×40 in shipping pallet | 48" | Fits, tailgate up | Fits, tailgate up | Fits, tailgate up | Fits, tailgate up |
"Tailgate down" assumes the roughly 18 inches a dropped tailgate adds on a typical pickup — measure yours before you count on it, and strap anything that overhangs. Width is the other half of the answer: a 48-inch sheet only lies flat on the bed floor when the wheel wells are more than 48 inches apart, otherwise it rides on top of the arches. For cubic feet of mulch, soil or gravel, run your dimensions through the bed volume calculator.
Volume is one limit, weight is the other. Check your Silverado 3500HD's real payload → · what it can actually tow →
More Silverado 3500HD specs
Bed size is one number among several. These carry the rest of the reference data for this truck specifically.
Other trucks with a Silverado 3500HD-size bed
Cross-shopping, or checking whether a cover you already own could move to another truck? These pickups come in a bed within two inches of a Silverado 3500HD bed.
- Chevrolet Silverado 1500
- Chevrolet Silverado 2500HD
- Ford F-150
- Ford F-250 Super Duty
- Ford F-350 Super Duty
- Ford Ranger
- GMC Sierra 1500
- GMC Sierra 2500HD
Same length still isn't the same cover — rail height and bed-rail profile differ by truck. Confirm with the fitment checker before you buy or swap.
Tonneau covers that fit the Silverado 3500HD
Not sure a cover will fit? Run the Silverado 3500HD fitment checker → for your bed length, the cover types that fit, and any Silverado 3500HD-specific gotchas.
Hands-on Silverado 3500HD cover reviews are landing soon. In the meantime, browse vetted, correctly-sized options for your bed:
Silverado 3500HD bed size — frequently asked
What bed sizes does the Chevrolet Silverado 3500HD come in?
The Chevrolet Silverado 3500HD has been offered with 4 bed lengths: 6.9 ft (82.25"), 8.2 ft (98.27"), 6.5 ft (78.9") and 8 ft (97.8"). The exact bed on your truck depends on its model year and cab — choose your year above to see which covers fit.
How do I measure my Silverado 3500HD bed length?
Measure the inside floor of the bed, from the bulkhead (the wall behind the cab) to the inside of the closed tailgate. Round to the nearest standard size — tonneau covers are sold by bed-length category (e.g. 5.5 ft, 6.5 ft, 8 ft), not the exact inch.
What bed size is the newest Silverado 3500HD?
The current Silverado 3500HD (2020–present) comes with 6.9 ft (82.25") and 8.2 ft (98.27").
Will a tonneau cover from an older Silverado 3500HD fit a newer one?
Not necessarily. Covers are matched to a specific generation and bed length, and both the bed length and the rail design can change between generations. Always match your exact model year and bed size before buying — the year-by-year table below shows where the Silverado 3500HD changed.
Will a 4×8 sheet of plywood fit in a Silverado 3500HD?
Yes — the longest Silverado 3500HD bed on record is 98.27", so a full 4×8 sheet lies flat with the tailgate closed. Width matters too: a 48-inch sheet only lies flat on the floor if the gap between the wheel wells is wider than 48 inches — on mid-size trucks it rides on top of the wheel arches instead.
What's the difference between the short and long bed Silverado 3500HD?
Across the model's history the beds run from 78.9" to 98.27" — a difference of 19 inches of usable floor. The longer bed hauls more and takes longer sheet goods, the shorter bed is easier to park and turn. They take different tonneau covers, so the bed you have decides which cover part number you order.
How much can a Silverado 3500HD tow?
Properly equipped, the Silverado 3500HD has been rated up to 36,000 lb across the generations on this page, with a maximum payload of about 7,442 lb. Those are best-case figures for a specific engine, cab and axle combination — your truck's door-jamb sticker and owner's manual are the numbers that count. Run them through the towing and payload calculators to see what's actually left for a trailer once passengers and gear are on board.
What cab configurations does the Silverado 3500HD come in?
The Silverado 3500HD has been offered as Regular Cab, Double Cab, Crew Cab and Extended Cab. Cab choice is what usually decides bed length — a bigger cab on the same wheelbase means a shorter bed, which is why two trucks from the same year can need different covers.
Does a tonneau cover on a Silverado 3500HD improve gas mileage?
A little, and only at highway speed. Independent testing puts the gain on a typical pickup at roughly 1–2%, which is real but small — on most Silverado 3500HD trucks that's a few dollars a tank, not a payback plan. Buy a cover for the dry, locked, secure bed; treat the mileage as a bonus.
