Built to Dominate: HEMI Jeep Engine Swaps from America’s Most Wanted

Unleash Raw Power with AMW Jeep Conversions Installed by Axleboy Offroad

O’Fallon, United States – July 24, 2025 / Axleboy Offroad /

AMW HEMI Jeep Gladiator parked on trail after engine swap at Axleboy Offroad

Axleboy Offroad, St. Louis’s trusted custom 4×4 outfitter, now installs America’s Most Wanted (AMW) high-performance Jeep engine conversions — unlocking legendary HEMI power for Wranglers and Gladiators ready to take command of the trail, the road, or both.

From the 505-horsepower AMW 392 to the jaw-dropping 1,025-horsepower AMW 1025 Demon 170 build, these street-legal monsters aren’t just engine swaps — they’re fully integrated performance machines, engineered to outdrive anything in their class.

Whether daily driving a lifted Jeep or hunting for more torque, traction, and throttle response, local 4×4 enthusiasts now have a proven, professional path to bring elite horsepower home.

Why Jeep Owners Want a HEMI — And Why Stock Doesn’t Cut It

A factory V6 might be fine for mall runs and light trails. But try towing, climbing, or punching out of a mud hole, and that stock motor shows its limits fast.

Big tires, lift kits, rooftop tents, and extra weight add up. And when your Jeep’s engine is underpowered, everything else suffers — transmission strain, reduced fuel economy, and sluggish off-the-line performance.

That’s why Jeep owners across the country are turning to HEMI-powered conversions from America’s Most Wanted 4×4 (AMW). These aren’t just powerful engines — they’re complete driveline packages, built with OEM-level engineering and tested for real-world abuse.

No guesswork. No half-measures. Just plug-in performance, professionally installed.

Jeep Engine Swaps That Actually Work — Because They’re Built as Systems

Anyone can drop a junkyard V8 into a Wrangler — but it won’t run like it came from the factory. It might not run at all.

AMW builds go far beyond just the engine. Every conversion includes a complete, integrated powertrain:

HEMI engine (392, 426, Hellcat, Demon, or Hellephant)
Heavy-duty 8-speed automatic transmission (8HP75 or Trackhawk variants)
Matched cooling, exhaust, harnesses, and modules
Custom-tuned programming and electronics
Reinforced axles (8-lug 60/80 sets for top-end builds)

They even include a build registry and certified AMW branding, so resale value stays intact.

All parts are engineered to work together, with drivability, reliability, and warranty-backed confidence built in.

Choose Your Weapon: Jeep HEMI Builds from 505 to 1,025 Horsepower

Every driver has a different goal. Some want balanced power for mountain passes and highway towing. Others want to light up 40s and climb rock gardens like a trophy truck. Here’s what’s available:

💪 AMW 392 | 505 HP

Perfect for daily driving and trail work. The 392 SRT HEMI is built for balance — 505 HP and 475 lb-ft of torque on tap, without sacrificing street manners.

0–60 in 4.5 seconds
8HP75 heavy-duty transmission
Ideal for dual-purpose rigs

🧨 AMW 717 | Hellcat Jeep Gladiator or Wrangler

Drop in 717 HP and 650 lb-ft of torque, and the term “trail-rated” takes on a whole new meaning. This isn’t fantasy — it’s an AMW-certified Hellcat Jeep you can drive to work.

3.9-second 0–60 times
Supercharged 6.2L HEMI
Precision handling + serious trail durability

🔥 AMW 840 and AMW 1000 | Demon & Hellephant Builds

Built for drivers who don’t want limits. These 8-lug turnkey systems start with 840 HP from a Demon powertrain — or go full Hellephant with 1,000+ HP and 950 lb-ft of torque.

Fully integrated drivetrains
60/80 axle sets included
Drag strip fast, trailhead reliable

Explore the full range of AMW Jeep Gladiator and Wrangler builds in person at Axleboy’s St. Louis shop.

Installed by the Pros — Built to Drive, Not Just Look Pretty

Axleboy Offroad is one of the only shops in the St. Louis area authorized and tooled to install AMW Jeep HEMI conversions to factory-level precision.

Every conversion gets:

Factory-trained mechanics using dealer-grade tooling
12-month/12,000-mile warranty on labor
OEM-level install standards, with all electronics, emissions, and drivability systems functioning seamlessly
Performance consultations to match the build to your actual use — not just your wishlist

It’s about more than power — it’s about making sure the Jeep drives great, even with 700+ HP under the hood.

Not Just for Show: Why AMW Builds Excel in St. Louis Terrain

Trail work in Missouri isn’t like Moab. It’s slick rock, mud ruts, wooded climbs, creek crossings, and backroad tow-ins. That means an engine upgrade has to do more than make noise — it has to be usable.

AMW’s attention to cooling, gearing, and drivability makes their conversions ideal for midwestern terrain:

Rock crawling? You need controlled throttle and low-end torque.
Highway hauling? The 8-speed keeps RPMs low and MPG decent.
Recovery work? Axles, suspension, and brakes hold up to real-world use.

This is why serious outdoor drivers — hunters, overlanders, SxS haulers — are turning to AMW Jeep engine swaps. They make a fast Jeep that still works hard.

About Axleboy Offroad

Axleboy Offroad has been building custom 4x4s in the St. Louis region for over two decades, delivering honest, reliable service to drivers who demand more from their vehicles. From basic maintenance to complete HEMI-powered trail rigs, every build is guided by real-world experience and engineered for the terrain Jeep owners actually face.

Axleboy’s factory-trained team brings dealership-level tools to a local shop setting — with guidance, performance guarantees, and a zero-compromise approach to getting it right the first time.