Jeep Speed Shop: 50-State Legal JK V8 Hemi Conversion Kit

That thing got a Hemi in it? You bet it does! Jeep Speed shop – the world-renowned Wrangler specialists – engineered the industry’s first 50-state legal JK HEMI conversion. Now, if you live in California or anywhere else with strict emissions, you can legally register your V8 Jeep conversion and drive it on the streets. See Crate Engine / Transmission Complete CARB Legal Hemi kit.

2007 Jeep JK 5.7L LX Hemi 545RFE CA Emissions Legal

2007 – 2011 Jeep JK Hemi engine swap

Every Wrangler owner loves their Jeep but wants more power under the hood. Sadly, the JK ships from the factory with a 3.8L V6 making 202 horsepower and 237 lb.-ft. of torque [KBB] – numbers lower than many compact cars. Furthermore, the stock engine usually mates to the weak 42RLE transmission that is known to overheat [ER].

Now, there’s an ideal remedy: the Wrangler JK V8 conversion from Jeep Speed Shop.

In this complete Carb legal Jeep Hemi engine conversion kit, you’ll find a truck-sourced 5.7L Hemi capable of 390 horsepower and 407 lb.-ft. of torque [CH]; upgrading almost doubles the performance of your Jeep. But power isn’t the only perk. The engine also features a cast iron block for durability, along with VVT and MDS technologies for maximum efficiency.

A stout Hemi engine deserves an equally robust transmission. That’s why our complete kit comes with the 545RFE automatic, made right here in the USA at the Chrysler plant in Indiana. View the complete crate engine / transmission CARB legal HEMI kit here.

The heavy-duty unit boasts three planetary gear sets as opposed to the usual two. A steep 3.00:1 first gear ratio makes it ideal for heavy-duty applications, while an overdrive ratio of 0.67:1 keeps it economical. There’s also a unique dual filtration system onboard to promote longevity [ER].

Jeep Speed shop makes the Hemi conversion an obtainable reality with our easy-to-install – and 50-state emissions legal – kit for 2007-2011 Jeep Wrangler JK models. The bundle contains everything needed to convert your rig from run-of-the-mill to king of the hill.

Jeep Speed Shop JK V8 conversion features and benefits

As a Jeep aficionado, you already know a Hemi Jeep V8 conversion is the coolest thing on four wheels. But the Jeep V8 conversions from Jeep Speed Shop aren’t just another engine swap kit. The product includes many exclusive features that make it the best on the market:

50-State legal Jeep-Hemi Conversion

Legally register and drive your converted Jeep on the streets, anywhere in the United States.

CARB-certified Jeep JK Hemi Engine Kit

Our factory-style kits have earned approval from the hard-to-please California Air Resource Board. So, there’s no need to visit state referee – we’ve done the legwork for you. Simply take your Jeep to the local smog station like any other vehicle.

Increased horsepower and torque

A Hemi engine offers a huge boost in both power and torque, making your Jeep more fun to drive. Off-road performance is also improved.

Production-line crate engine and transmission

The engines and transmissions in our Carb legal Jeep Hemi conversion kits are genuine Chrysler products. As such, the factory warranty remains in effect. The dealer can perform all recalls and covered repairs.

All-inclusive package

The kit includes all necessary hardware, so there’s no need to scrounge for nuts and bolts.


Only OEM parts are used to make the conversion look like a factory option.

100% new parts

All components found in the kit are brand-new for guaranteed reliability and performance.

Custom programmed computer

Each kit comes with a PCM tuned specifically for Wrangler JK models. The result is factory-level drivability and reliability.

Two different Jeep Wrangler V8 swap options, one great outcome

There are two different ways to upgrade your Jeep to a Hemi: a complete package or an installation kit. The complete package comes with both a crate 5.7L V8 and 545RFE four-speed. With the DIY installation kit, you supply your own engine and transmission.

2007-2011 Jeep conversion kits

These are just a few of the highlights associated with the DIY conversion kit:

  • Easy installation with step-by-step instructions
  • All necessary hardware included
  • Specially-tuned PCM complete with wiring harness
  • New radiator

2007-2011 Jeep conversion kits w/engine and transmission

These are just a few of the highlights associated with the complete conversion kit:

  • 100% new 5.7L Hemi crate engine and 545RFE automatic transmission
  • Brad new alternator, AC compressor, power steering pump and belt
  • New cooling system components including a fresh radiator
  • Specially-tuned PCM complete with wiring harness
  • The kit can be professionally installed by Jeep Speed Shop