Best Train Horn for Jeep Gladiator JT: Bolt-On & Spare-Tire Kits

If you want the best train horn for a Jeep Gladiator JT, the real decision isn’t which horn is loudest — it’s where the air system lives, because the Gladiator gives you three workable homes for it: a bolt-on frame-rail kit under the cab, the spare-tire well under the bed, or a custom bracket that fills the spare-tire space with a big horn setup.

Why the Gladiator is not just a Wrangler with a bed

The Gladiator shares its front half with the Wrangler JL, so a lot of Jeep-specific horn hardware is designed around both trucks. The back half is a different story. According to Wikipedia’s JT entry, the full-size spare that sits on a Wrangler’s tailgate moves underneath the cargo bed on the Gladiator, and the truck rides on a 137.3-inch wheelbase. That long frame and the empty space under the bed are exactly what make the Gladiator easier to fit with a train horn than a two-door Wrangler.

Model year and engine matter too. The JT has been sold as a 2020 model year and later. It launched with the 3.6L Pentastar V6, and a 3.0L EcoDiesel was offered for the 2021 through 2023 model years before being dropped. As you’ll see below, almost every Gladiator-specific horn kit excludes the diesel, so check what’s under your hood before anything else.

If you’re shopping for a Wrangler too, our Jeep Wrangler JK and JL train horn guide covers the Wrangler-only kits, including the complete HornBlasters Wrango packages that don’t fit the Gladiator.

The three ways to mount a train horn on a Gladiator

Frame rail (under cab)

Vehicle-specific bracket on the passenger-side frame rail. Keeps the spare. Lowest cost of entry.

Spare-tire well

Horn, tank, and compressor on one bracket where the spare used to hang. Hidden and tidy, but the spare has to go somewhere else.

Custom heavy bracket

Thick steel bracket in the spare-tire space for oversized horns like a Shocker S6. Most expensive, made to order.

Each option has a different idea of what counts as “the kit,” so compare the full system cost, not just the sticker price on the horn.

Option 1: Kleinn JT220 bolt-on frame-rail kit

The most Gladiator-specific horn on the market is Kleinn’s JT220 (part KL JT220). Kleinn’s product page lists it for 2020-2026 Gladiator JT trucks, rates the dual ABS trumpets at 154.2 dB, and calls it 100% bolt-on with no drilling. Quadratec’s listing adds that the bracket mounts to the passenger-side frame rail beneath the cab, rates the install as intermediate at 2-3 hours, and lists a $249.95 price — the same price Kleinn shows.

In the box you get two horns, the custom bracket, a nickel-plated horn button, and installation hardware, according to Quadratec. Kleinn backs it with a 1-year limited warranty.

• Truly direct-fit: one bracket, factory bolt holes, no drilling
• Keeps the factory spare tire under the bed
• Highest published rating of any Gladiator-specific kit we found

• Horn only — Kleinn says you need an air system with at least 100 PSI and a 1-gallon tank
• Excludes diesel, hybrid, and aftermarket-exhaust trucks per Kleinn
• Like every brand-published dB figure, 154.2 dB comes without an independent test distance

Kleinn’s similar JL220 kit is also listed by some retailers for the 3.6L Gladiator; we cover that one in our Kleinn JL220 review. If you’re starting from scratch on a Gladiator, the JT220 is the safer part number because Kleinn itself lists it for the JT.

The matching air system: Kleinn JT-OBA

Kleinn designed the JT220 to pair with its JT-OBA onboard air system, and that pairing is the cleanest “factory-looking” frame-rail install for a gas Gladiator. Quadratec lists it at $799.95 and describes a 150 PSI waterproof compressor, a 2.8-gallon tank, and a custom bracket that sits under the cab inside a protected cage and skid plate. ExtremeTerrain lists the same kit for 3.6L V6 Gladiators at $664.99 at the time of writing and adds a 23-amp draw and a 100% duty cycle at 100 PSI, meaning the compressor can run continuously at that pressure without overheating.

The kit also includes a tire inflator with a digital gauge and a 30-amp relay, so you get usable trail air on top of the horn. Quadratec rates the install at 4-5 hours and notes the same diesel and aftermarket-exhaust exclusions as the horn.

At Quadratec’s list prices, JT220 plus JT-OBA comes to $1,049.90 for a complete, bolt-on, spare-keeping horn system. If you want to understand why that 100% duty cycle rating matters for repeated honks and tire fills, our compressor duty cycle explainer breaks it down.

Option 2: Spare-tire delete kits

The Gladiator’s under-bed spare hangs from a cable winch that you lower with a crank shaft pushed through a small port in the rear bumper, as Muddy Ruttzz’s spare-access walkthrough explains. That same hanging space is where HornBlasters’ Spare Tire Delete kits go: the horn, tank, and compressor share one bracket in the spare’s spot.

Owner installs posted to Train Horn Forums show this is a proven Gladiator route. A 2024 Gladiator owner fitted the Spare Tire Delete Kit 232 Medium Duty, and 2020, 2021, and 2022 Gladiator owners fitted the Stealth Spare Tire Delete Kit, which that forum lists at $1,279.99 and which HornBlasters markets as giving an extra 5 inches of ground clearance over its standard version. One 2022 owner added a wireless horn remote rated for 100 yards, a 30-foot coiled tire-inflation hose, and an electric drain valve — a good template if you want the horn to double as trail air.

• Everything is out of sight under the bed
• No frame drilling for the horn location
• Larger four-trumpet horns than any under-cab kit

• Your spare has to move to the bed or a bed-rack carrier — and that’s a big deal for a trail rig
• Ground clearance under the rear depends on which version you buy
• Costs more than a JT220 plus JT-OBA setup

For the full spec sheet, prices, and fill times on the standard version, see our HornBlasters Spare Tire Delete Kit review.

Option 3: HornBlasters Goliath bracket for big horns

If a two- or four-trumpet horn isn’t enough, HornBlasters sells a Goliath mount built for the Gladiator. Per its product page, it’s 1/4-inch plasma-cut steel that bolts onto the frame rails in the spare-tire location, it’s listed for 2019-2022 Gladiator trucks, and it’s priced at $665.99. HornBlasters lists it for the Shocker S6 and quotes a 3-4 week lead time because each bracket is made to order.

Keep in mind this is a bracket, not a horn kit — the horn, tank, compressor, and plumbing are all separate purchases. Because the listed fitment stops at 2022, owners of newer Gladiators should confirm fitment with HornBlasters before ordering.

How to choose the right setup for your Gladiator

Setup	What you get	Keeps spare?	Fitment	Price
Kleinn JT220	Dual horns, bracket, button	Yes	2020-2026 JT, no diesel	$249.95
Kleinn JT220 + JT-OBA	Horns plus 150 PSI, 2.8-gal air system	Yes	3.6L V6 JT	$1,049.90 (Quadratec list)
HornBlasters Stealth Spare Tire Delete	Horn, tank, compressor on one bracket	No	Shown on 2020-2022 JT installs	$1,279.99
HornBlasters Goliath mount	Bracket only	No	2019-2022 Gladiator	$665.99

• Gas Gladiator, want to keep the spare: Kleinn JT220 plus JT-OBA is the most direct-fit answer.
• Already running a spare in the bed or on a bed rack: a spare-tire delete kit gives you a bigger horn in a hidden spot.
• EcoDiesel owners: both Kleinn Gladiator kits exclude the diesel, so plan a custom mount — our truck horn mounting guide walks through frame-rail and behind-cab options.
• Shocker S6: the Goliath bracket is built for that, if your model year is on the fitment list.

Whatever you pick, keep the compressor away from exhaust heat and road spray — our compressor mounting guide covers that. And before you use a 150-plus dB horn on public roads, read our rundown on whether train horns are legal on cars; in many states it’s the use, not the install, that gets you a ticket.

Sources

• Kleinn — Bolt-on Dual ABS Train Horn Kit, 2020-2026 Jeep Gladiator (JT220) — JT220 part number, $249.95 price, 154.2 dB rating, fitment and diesel/hybrid/exhaust exclusions, no-drill bolt-on, 100 PSI / 1-gallon air requirement, 1-year warranty, JT-OBA pairing
• Quadratec — Kleinn JT-220 Dual Train Horn Add-on Kit for Jeep Gladiator JT — passenger-side frame rail mounting location, 2-3 hour install, included items, $249.95 price, diesel exclusion
• Quadratec — Kleinn JT-OBA On-Board Air System for Jeep Gladiator JT — $799.95 price, 150 PSI compressor, 2.8-gallon tank, under-cab cage and skid plate, 4-5 hour install, included tire inflator and 30-amp relay, exclusions
• ExtremeTerrain — Kleinn Jeep Gladiator Direct Fit Onboard Air System — $664.99 price, 3.6L V6 fitment, 23-amp draw, 100% duty cycle at 100 PSI
• HornBlasters — Goliath Train Horn Mount (2019-2022 Jeep Gladiator) — $665.99 price, 2019-2022 fitment, 1/4-inch plasma-cut steel, spare-tire frame-rail mounting, Shocker S6 compatibility, 3-4 week lead time
• Wikipedia — Jeep Gladiator (JT) — 2020+ model years, 3.6L V6, 2021-2023 EcoDiesel, 137.3-inch wheelbase, under-bed full-size spare
• Muddy Ruttzz — Jeep Gladiator Spare Tire Access — under-bed winch spare and how it is lowered
• Train Horn Forums — 2024 Jeep Gladiator Spare Tire Delete Kit 232 Medium Duty — owner install of the Spare Tire Delete Kit 232 on a Gladiator
• Train Horn Forums — 2020 Jeep Gladiator Stealth Spare Tire Delete Kit — owner install and $1,279.99 Stealth kit price
• Train Horn Forums — 2021 Jeep Gladiator with Stealth Spare Tire Delete Kit — owner install and the extra 5 inches of ground clearance claim
• HornBlasters — Stealth Spare Tire Delete Kit — extra 5 inches of ground clearance versus the previous Spare Tire Delete kit, four-trumpet Shocker XL horns
• Train Horn Forums — 2022 Jeep Gladiator Stealth Spare Tire Delete Kit — owner install with 100-yard wireless remote, 30-foot inflation hose, and electric drain valve

Keep reading

• Best Train Horn for Jeep Wrangler (JK & JL): 2026 Guide
• Best Train Horn for Ford Bronco & Bronco Sport: Fitment and Kit Picks
• Where to Mount a Train Horn on a Truck: Best Spots & Angle
• Best Train Horn for Chevy Colorado & GMC Canyon: Fitment Guide
• Kleinn JL220 Jeep Wrangler Bolt-On Train Horn Kit Review