What we researched for this specific generation: where an enclosure actually fits, what the factory speakers are, how the factory audio is wired, and which real builds and commercial products exist for it. Confidence badges say how well each figure is sourced — this is research, not manufacturer spec.
Body styles covered: Regular Cab, Double Cab, Crew Cab
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | underseat storage compartment, crew cab (shared with 2500/3500 HD Crew Cab 2020-2024) |
|---|---|
| Outer bounding box | ~53"L x 10"W x 10"H (front) / 8"H (rear) — from a factory-style storage product; cross-checked against the AudioControl loaded enclosure's own 52"W x 14.25"D x 10.25"H footprint, broadly consistent |
| Known obstructions | None specifically documented beyond the front-to-rear height taper already captured |
| Usable volume estimate | 3 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" or 1x12" sealed |
|---|---|
| Box type | sealed |
| Location | under rear seat, respect 5"/7" downfire depth limit |
| Subwoofers | 2x10" ported (real example: AudioControl TXGM19D10, 600-1400W RMS) or 4x8" ported (Skar quad) |
|---|---|
| Box type | ported |
| Location | under rear seat |
Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.
| Factory speaker size | 6x9" — real, confirmed, a genuine change from the older GM-truck family's oval-plus-adapter convention (see the 2014-2018 K2XX entry). |
|---|---|
| Adapter bracket needed | unconfirmed |
| Tweeter | REAL, IMPORTANT ARCHITECTURE FINDING: on non-Bose trims, this generation is confirmed to NOT have a dedicated tweeter at all — the dash-corner unit (2.5"/2.75") is a MIDRANGE speaker, not a true tweeter, per real forum sourcing. This is a genuine change from the sibling GMT900/K2XX entries' confirmed dash-corner TWEETER — do not assume continuity across this generation boundary. Bose-equipped trims may differ, not independently confirmed. |
| Midrange | Dash corner |
| Factory speaker size | unconfirmed for this exact generation |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | Bose available on upper trims (carried over from prior generation) — exact trim cutoffs for this generation not yet confirmed |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — multiple loaded, plug-and-play underseat enclosures exist specifically for this exact fitment |
| Head unit | No replacement needed |
Excellent commercial data — multiple named, spec'd products confirm this fitment. Real mounting-depth constraint found and worth encoding as a general design rule for this platform: downfire without a seat lift = 5" max depth; downfire with a 2" seat lift = 7" max depth; upfire adds 0.55" to either. Compatible across Silverado/Sierra 1500 Crew Cab (2019-2024) AND 2500/3500 Crew Cab (2020-2024) per multiple commercial listings — same underseat geometry across the light and heavy-duty crew cab.
Outside links. Some are commercial products, some are owner builds posted on forums — the label says which. We do not endorse any of them.
Each link opens the tool with this vehicle already selected.
Measure your own vehicle. Trim levels, factory subwoofer options, and mid-generation changes all move these numbers, and a box cut to a researched figure that does not match your truck is wasted wood. Where a badge reads Unconfirmed, treat the value as a starting point for your own measurement, not as an answer.