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: 4-Door Crew Cab (only body style offered)
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, both platform styles (seat-delete community data, not just audio products) |
|---|---|
| Outer bounding box | Low Standard 60% platform: 32.5"W x 29.75"L, access hatch 20.5"x13", ~6"H under-platform. High Platform 40% (driver): 21"W x 36"L, ~9"H. High Platform 60% (passenger): 31"W x 36"L, ~9"H. Extended 40%: 21"W x 38"L. |
| Known obstructions | The 'Low Standard' vs. 'High Platform' choice itself trades cargo height for underneath clearance (6" vs. 9") — this is a real design choice, not a fixed constraint, since Goose Gear sells both configurations for the same truck |
| Usable volume estimate | 1.3 ft³ |
Suggested configurations for this vehicle, not prescriptions. Run the numbers in the Box Builder before you buy anything.
| Subwoofers | 1x10" under single rear seat, no seat lift needed |
|---|---|
| Box type | sealed |
| Location | under one rear seat, preserves other seat + legroom |
| Subwoofers | 2x12" ported (1.40 ft3) or 2x8" ported (seat-lift required) |
|---|---|
| Box type | ported |
| Location | under rear seat(s) |
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 | 4" — real, confirmed via multiple retailer/aftermarket sources describing 'a big upgrade over the factory 4-inch speakers.' Real, genuinely verified cross-badge platform-sharing case (not assumed): this matches the Wrangler JL entry's own independently-confirmed 4" factory door speaker — same JL/JT platform, same door speaker size, checked directly rather than carried over. |
|---|---|
| Known obstructions | Same JK-vs-JL/JT pattern already flagged on the Wrangler entries: a 6.5"+ upgrade requires cutting new mounting holes/brackets, not a simple swap. |
| Adapter bracket needed | yes for 6.5"+ upgrades (cutting required, per shared JL/JT platform pattern) |
| Factory speaker size | n/a — Gladiator (JT) is a 4-door-only Crew Cab; genuine rear door speakers were not independently confirmed to exist on this body style (distinct from a Wrangler Unlimited's own rear doors) — flagged rather than assumed present. |
|---|---|
| Adapter bracket needed | unconfirmed |
| Factory amp / premium audio | Real, confirmed brand, incomplete trim gating. Alpine Premium Audio System confirmed available since the Gladiator's introduction — sourcing consistently describes it starting with the 2020 model year specifically, not 2019; worth checking whether this entry's 2019 start date reflects real first-year availability or an early-release/pre-production edge case. Shares its Alpine system architecture with the same-era Wrangler JL (same platform). Exact trim gating (which Gladiator trim requires it) not independently confirmed. |
|---|---|
| Adding subs without a head-unit swap | Confirmed straightforward — multiple commercial direct-fit products exist |
| Head unit | No replacement needed |
Wrangler-based pickup — genuine crossover audience with the Wrangler community already. Real specific products: Skar Audio dual 12" ported (1.40 ft3 total, 4.5" back spacing, 9.5" speaker hole); a dual 8" option requiring a 2" seat lift (.75"/1" Russian Baltic Birch, tuned 33Hz, 7.3125" cutout, 8" mounting depth, ~65 lbs); SoundSkins dual 8" ported (44"W x 9"/6"H x 9.75"D, 7.75" mounting depth, 7.32" cutout, 28.25 lbs, 0.6 ft3/chamber tuned 42Hz). Community builds favor going under just ONE rear seat to preserve dual-seat capacity and legroom on the other side — a real, specific installation philosophy worth surfacing.
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.