GMC · 2020–2026
GMC Sierra 3500HD dimensions
Length, width with and without mirrors, height and wheelbase — and whether it clears a standard garage door and bay.
Overall length
231.9–266"
depending on cab and bed
Shares the Silverado 3500HD body. Dual-rear-wheel versions are 96 in across the rear fenders. These figures are inherited from the mechanically identical sibling truck rather than published separately for this model. Off-road trims run wider and taller than the ranges above — measure your own truck before you rely on any of it.
Will a Sierra 3500HD fit in your garage?
Checked against the four common garage setups, using the longest and tallest version of this truck — so a pass here is a pass for every configuration.
Single garage, 8×7 ft door
Fits — but tightOpening 96×84", bay 240" deep.
Depends on your configuration. The shortest version fits a 240 inch bay with 8 inches to spare; the longest is 266 inches long and would not close the door.
About 3 inches of headroom at the door. Anything on the roof — rack, antenna, light bar — uses that up immediately.
You will have to fold the mirrors every time. Extended they span 102 inches against a 96 inch opening; folded they come in at 86 inches.
- Depth spare: 8" shortest, -26" longest
- Headroom: 3"
- Mirror clearance: -6"
Single garage, 9×7 ft door
Fits — but tightOpening 108×84", bay 240" deep.
Depends on your configuration. The shortest version fits a 240 inch bay with 8 inches to spare; the longest is 266 inches long and would not close the door.
About 3 inches of headroom at the door. Anything on the roof — rack, antenna, light bar — uses that up immediately.
- Depth spare: 8" shortest, -26" longest
- Headroom: 3"
- Mirror clearance: 6"
Double garage, 16×7 ft door
Fits — but tightOpening 192×84", bay 240" deep.
Depends on your configuration. The shortest version fits a 240 inch bay with 8 inches to spare; the longest is 266 inches long and would not close the door.
About 3 inches of headroom at the door. Anything on the roof — rack, antenna, light bar — uses that up immediately.
- Depth spare: 8" shortest, -26" longest
- Headroom: 3"
- Mirror clearance: 90"
9×8 ft door, 24 ft deep
Fits comfortablyOpening 108×96", bay 288" deep.
Clears on length, width and height with room to work around it.
- Depth spare: 56" shortest, 22" longest
- Headroom: 15"
- Mirror clearance: 6"
"Mirror clearance" is the total, both sides combined — halve it for the gap at each mirror. A negative number means the mirrors have to be folded.
The mirrors add 20.1 inches
This is the number people forget. The Sierra 3500HD body is 81.9 inches wide, which sounds manageable against a 96 inch door — until the mirrors take it to 102 inches. Folded, it comes back to 86 inches.
| Measured across | Width | Through an 8 ft (96") door | Through a 9 ft (108") door |
|---|---|---|---|
| Body only | 81.9" | 14.1" spare | 26.1" spare |
| Mirrors folded | 86" | 10" spare | 22" spare |
| Mirrors extended | 102" | 6" too wide | 6" spare |
Trucks of a similar size
Closest in overall length — useful if the Sierra 3500HD is a couple of inches too long for your bay.
Sierra 3500HD size — frequently asked
How long is a GMC Sierra 3500HD?
Between 231.9 and 266 inches, depending on cab and bed. That spread is the whole ball game for a garage: the short configuration and the long one are effectively different vehicles when it comes to parking. Wheelbase runs 141.6 to 176 inches.
How wide is a GMC Sierra 3500HD?
81.9 inches across the body, 102 inches with the mirrors extended and 86 inches with them folded. The mirrors add 20.1 inches, and they — not the body — are what has to clear your garage door.
Will a GMC Sierra 3500HD fit in a standard garage?
Yes, in 1 of the 4 standard setups checked on this page, and tightly in 3 more. The table above shows which, and what fails where it does not.
How tall is a GMC Sierra 3500HD?
78.2 to 81 inches, depending on drivetrain and suspension. A standard 7 ft garage door gives 84 inches of opening, so the stock truck clears — but a roof rack, light bar or lift kit eats that margin quickly.
What is the Sierra 3500HD bed width between the wheel wells?
51 inches. That is the number that decides whether sheet goods lie flat on the bed floor: a 48 inch sheet of plywood needs more than 48 inches of clearance, so anything under that has to ride on top of the wheel wells instead.