Best V8 Engine Swap for a Jeep Wrangler: Hemi vs LS vs LT vs Coyote

The best V8 engine swap for most Jeep Wranglers is a Chrysler Hemi: the 5.7 for a value build, the 6.4 (392) for maximum power. It comes from the same manufacturer as the Jeep, which makes the electronics far easier to integrate, and it has the deepest catalog of proven swap kits for the JK and JL. GM’s LS and LT families are the main alternative, with cheaper used donors and the biggest aftermarket. Ford’s Coyote and 7.3L are newer choices with fewer proven Jeep kits.

On a JL there is a fourth option that beats most swaps on paper: buying the factory V8 Wrangler, sold as the Rubicon 392 from 2021 and as the Moab 392 for 2026. This page compares the engines. For what the whole project costs (parts, labor, axles, emissions), see Jeep Wrangler V8 conversion cost.

The main V8 swap options compared

Ratings are the manufacturer figures for the engine in its original or crate form. Installed output in a Jeep depends on intake, exhaust and tuning. The Ford figures come from Ford Performance’s Coyote and 7.3L crate pages; the GM figures from Chevrolet Performance.

Why the Hemi is the usual answer

An engine swap is mostly an integration project. The engine must bolt in, but it also has to talk to the Jeep’s instrument cluster, ABS, stability control, transmission and body computer. A Hemi comes from the same company and shares much of the same electronic design approach, so there is less to translate. That is where swaps save or lose the most money and time.

The Hemi also has the longest track record in Wranglers, especially the JK, so mounts, crossmembers, exhaust manifolds, cooling packages and harness solutions exist as products rather than fabrication jobs. More shops have done it, and more owners have documented the mistakes.

5.7 or 6.4? The 5.7 is the value pick: used engines are common because Chrysler fitted them to millions of trucks and SUVs. The 6.4 is the power pick and has a unique advantage on a JL: it is the engine Jeep itself put in the Wrangler 392, which makes it the swap with the closest factory reference for cooling, mounts and drivetrain. It is also the only V8 for which a certified Wrangler configuration exists (on 2021 and later JLs), which matters for emissions (see below).

The GM LS and LT route

The LS family is the default engine swap across the hobby for good reasons: compact external size, light weight for the output, enormous tuning knowledge, and used 4.8L, 5.3L and 6.0L truck engines at low prices. A crate LS3 from Chevrolet Performance is rated at 430 hp and 425 lb-ft.

The cost is integration. A GM engine computer does not natively speak to a Jeep’s cluster, ABS and stability control, so the build needs a harness and interface solution that keeps the speedometer, warning lights and driver aids working. On a JK this is well trodden. On a JL, with more modules and driver aids, it takes more work and fewer kits exist.

The newer LT1 (rated at 455 hp and 455 lb-ft as a crate engine) adds direct injection and more modern electronics: stronger, but with a more demanding fuel system and more tuning work than an LS.

Ford Coyote and the 7.3L

The Coyote is a high-revving four-cam V8. Ford Performance rates the Gen 4 crate engine at 480 hp at 7,150 rpm and 415 lb-ft at 4,900 rpm, and lists it at $12,650 retail. That character suits a fast desert or highway build more than a crawler, and the wide cylinder heads make it harder to package between Wrangler frame rails and steering components.

The 7.3L from the Super Duty trucks takes the opposite approach: a large-displacement pushrod engine that Ford rates at 485 lb-ft at 4,000 rpm, with a cast iron block and a listed weight of 580 lb. The torque suits crawling and towing; the weight sits over a front axle and steering that were not designed for it, which shows up in steering wear and handling. Ford lists the crate engine at $9,790 and refers buyers to its Techline for the control pack, which is a separate purchase.

Ford’s own product pages warn that installing a part in a vehicle it is not intended for may violate U.S. emissions laws, a reminder that applies to every engine on this list.

The transmission decides as much as the engine

Every engine on this list needs a gearbox that can take its torque, and that choice affects cost, wiring and how the Jeep drives. There are three usual routes. Keeping the Jeep’s own automatic saves money and keeps the shifter and cluster working, but the factory unit was rated for factory torque. Using the transmission that came with the donor engine (or the manufacturer’s matched crate package) gives a known-good pairing and simpler engine control, at the cost of new adapters, crossmember and driveshaft lengths, and another computer to integrate. A manual gearbox removes a layer of electronics but needs a clutch, pedal and hydraulic system that fit the Wrangler.

Whichever route you choose, the transfer case must bolt to the new transmission, which usually means an adapter. Ask any kit supplier exactly which transmission and transfer case combination its parts are designed for.

The factory alternative: Wrangler 392

Jeep put a V8 back in the Wrangler for 2021 with the Rubicon 392, using a 6.4L Hemi rated at 470 hp and 470 lb-ft with an eight-speed automatic. It continued through the 2025 Final Edition, and for 2026 Jeep’s January 2026 announcement lists the Moab 392 from $79,995 plus $1,995 destination, sold in all 50 states.

For anyone shopping for a JL to swap, a used or new 392 is the benchmark. It is emissions certified everywhere, the axles, brakes and cooling were engineered for the engine, the stability control and driver aids all work, and a new one carries a factory warranty. The trade-offs are price and fuel: EPA rates the 2023 model at 14 mpg combined. A swap makes more sense on a JK (which never had a factory V8), on a Jeep you already own, or when you want something Jeep does not sell, such as a manual gearbox behind a V8.

How to choose for your build

• Generation first. Confirm a proven kit exists for your exact generation and engine combination before choosing an engine. A JK kit does not fit a JL, and 2.0L, 3.6L and 4xe JLs differ.
• How you drive. Rock crawling favors low-rpm torque and gearing. Desert and highway driving favors horsepower and cooling.
• Who does the wiring. If it is you, and it is your first swap, choose the combination with the most documentation, which usually means a Hemi.
• Emissions where you register. EPA’s tampering policy says an engine switch has a reasonable basis only if the result matches a certified configuration of the same or newer model year, and adds that this is generally not possible with a different manufacturer’s engine. California requires a BAR Referee inspection. The conversion cost guide covers the compliance steps and what they cost.
• The rest of the drivetrain. Factory axles, driveshafts and brakes were sized for factory engines, and more power at the wheels also stresses steering parts. The death wobble guide covers the steering wear that big tires and extra weight speed up.

Is a V8 the right upgrade at all?

Ask what problem you are solving. If it is passing on the highway, a factory 392 or a supercharger on the existing engine may get there for less time in pieces. If it is towing, the frame, hitch and axle ratings in the Wrangler towing capacity guide do not change with the engine. If it is crawling, gearing and lockers often do more than horsepower, and a diesel is worth comparing: see the diesel conversion cost guide and the factory EcoDiesel option it covers.

If the answer is that you want a V8 Wrangler for its own sake, the swap makes sense on its own terms. Start with a Hemi unless you have a strong reason not to, and choose the kit before the engine, because the kit decides how many of the hard problems are already solved.