Product Description

Current Build Times: 8–12 Weeks

Request GEN4 LS JK Swap Estimate

Fill out our online form with your build info. We'll review compatibility and send a complete estimate with notes.

Overview

This premium DIY conversion kit is designed for 2012–2018 Jeep JK models using a GM GEN4 LS engine (07–13 5.3L/6.2L or 07–17 6.0L) paired with a 6L80 or 6L90 6-speed automatic transmission.

We simplify the process—our 100% new, plug-and-play harness requires minimal splicing and no need to modify or send in your factory wiring.

The included EZ CanBus module integrates factory Jeep systems with GM components, enabling a seamless swap with full functionality—Jeep gauges, PRNDL display, cruise control, AC, and more.

Technology

The EZ CanBus system bridges communication between the Jeep and GM modules. It translates messages between the two networks, eliminating the need for additional sensors, reluctor rings, or simulators.

Full factory integration includes cruise control, remote start, A/C controls, PRNDL with TAP shifting (1–6), functional check engine lights, and emissions readiness.

Transfer Case Compatibility

** If your 12+ JK is automatic or Rubicon, you will need a different transfer case. Use a non-Rubicon 241J from a 07–11 JK (auto/manual) or from a 12–18 JK with a manual transmission. **

Current Features

• 100% new harness—no core required
• EZ CanBus integration module
• PRNDL gear display with TAP shift (1–6) displayed on the dash
• GM TAP shifting using Jeep cruise switch or factory Jeep bump shifter
• Fully functional factory cruise control using factory Jeep switches
• Factory A/C control 
• Jeep remote start supported
• Full GM emissions compatibility
• GM VVT and AFM/DOD compatible

What’s Included in the Premium Kit

• Full LS powertrain harness and Jeep JK conversion harnesses
• EZ CanBus module (IP53/ISO9001 rated)
• EZ OBD2 Options Flash cable
• Motor mount Brackets (frame-side weld-in)
• Transmission mount plates (bolt-in)
• Transfer case adapter: 6L80-90 to Jeep 241J ** (non-Rubicon)
• Transfer case input shaft and seal
• Transmission mount and shifter brackets
• GM accelerator pedal bracket (bolt-in)
• Fuel line engine to factory JK feed line
• GM E38 ECU mounting bracket (mounts behind Jeep ECU)
• GM EVAP kit (vent valve + pressure sensor)
• Instruction manual
• Tuning device (HP Tuners)
• Direct-fit A/C hose kit for GM truck compressor
• A/C compressor adapters
• 52mm aluminum radiator (LHI LS3 or RHI Truck style)
• Coolant overflow reservoir
• 4" composite air intake with filter
• Steering wheel TAP shift via cruise switch (adds TAP shifting to steering wheel)
• Tech support

Component Highlights

Radiator: Our direct-fit 52mm aluminum radiator bolts into factory Jeep JK mounts. It matches the LS engine’s hose routing with correct inlet/outlet and a steam port fitting. Available in LHI for LS3 or RHI for Truck water pump configurations.

A/C Hoses: Custom-fit to Jeep JK firewall and condenser. Designed to work with GM truck compressors and integrate the factory Jeep AC pressure sensor.

Air Intake: Made of composite material for reduced heat soak. Includes couplers, clamps, K&N filter, MAF port, and breather. Requires GM 15865791 credit card-style MAF sensor.

Tuning: Includes software to read/save your GM ECU/TCM calibration. Send it to us—we’ll modify and return a custom tune. 

Optional or Add-On Items

• GM E38 ECU (pre-programmed)
• GM Accelerator pedal
• Enclosed airbox upgrade
• More items coming soon!

Resources

DIY Kit Instructions (PDF)
Transfer Case Input Shaft Instructions (PDF)
Watch Our Install Video

Have Questions?

Email us before ordering: info@rpmextreme.com