Additional Images

  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • rpmextreme gen4 jeep jk ls conversion kit
  • 2015-2016 jeep jk ls swap. diy kit
Part Number: 12+LSJK-PREM-52mm - 12+ Premium LS Conversion Kit
Retail: Web Price: $7,350.00

Product Description

This is our premium DIY conversion kit for 2012-2017 Jeep  JK when using a GM LS GEN4 series engine (07-13 5.3, 6.2) (07-17 6.0) along with a 6L80E 6 speed automatic transmission.


We know it can seem daunting to try and wrap your head around so many options, we try and make it a no brainer to get your Jeep up and running. Our harness comes complete plug and play and is 100% brand new. No need to send in your old harness or modify anything and with only a few wires to splice into the existing Jeep its extremely easy to be up and running. 


We incorporate a state of the art CanBus module to take care of all the data, that means you get a factory style fully integrated GM engine running in your Jeep with all the factory bells and whistles operating.


Our harness integrates the Jeep and GM side harnesses into one single harness. The engine harness routes directly to the ECU with a factory plug at the factory firewall connector. The bulk of the harness routes behind the engine and under the fuel rails which is visually appealing and allows for factory engine covers to be used. Our under dash harness incorporates the GM accelerator pedal, ALDL, GM fuses-Relays and EZ CanBus module all while plugging directly into the main harness. 

The final result is a harness that features improved aesthetics and versatility, easier to install and offers premium quality and durability. 




The big difference in our conversion compared to others is the technology we incorporate. Your Jeep JK is a CanBus controled vehicle. That means is everything is run by a computer speaking it's own language to all the other modules on the CanBus. GM also uses a CanBus on their GEN IV engines and vehicles, however the GM and Jeep system do not speak the same language. What our EZ CanBus system does is take the GM CanBus and Jeep CanBus run them through our EZCanBus module and translate the language between the 2 systems allowing us to send messages between each one. We are able to take the GM tachometer signal and send it to the Jeep gauges without using an add on reluctor ring or simulator modules. This saves you a lot of time on the install and this is much more reliable. We are also using the GM coolant temp signal and sending it to the Jeep gauge, again saving you time and money by not having to install an extra coolant temp sensor in the engine. Some other cool things we are able to do is have a 100% functioning PRDNL display on the dash with 1-6 gears indicated during TAP shifts. We are also able to use the factory Jeep cruise control switch to control not only the cruise control but also the GM TAP shifting with the added benefit of not having to modify your shifter or instrument cluster. The cruise light and check engine light will function as normal thanks to the EZ CanBus module. We have many other features built into the EZ CanBus system and it is fully upgradable as we add new items. 


 Current features: 

* 100% New harness 

EZ CanBus system 

PRNDL display with 1-6 gears in manual mode indicated on the dash 

* GM TAP shifting using your factory Jeep cruise switch 

* GM TAP shifting using your factory Jeep "bump Shifter" (unmodified)

* Fully functional cruise control using your factory Jeep cruise switch 

* Factory AC control with evaporator temp monitoring 

* Factory Jeep remote start functional 

* Full GM Emissions compatible 

* GM VVT and AFM-DOD compatible 


What is in the premium kit: 

LS conversion harness (under hood)

* LS conversion harness (under dash) 

EZ CanBus module IP53 and ISO 9001 rated

* Weld in motor mount plates 

* Transmission mounting plates 

* Transfer case adapter 6L80E to Jeep 241J (NON Rubicon) 

* Transmission mount 

* Transmission shifter cable bracket 

* Transfer case shifter cable bracket 

* Accelerator pedal bracket 

* Plug n play fuel line

* GM ECU mounting bracket

* GM fuel tank pressure sensor 


* Instructions

* ECU-TCM Tuning 

* Direct fit AC hose kit (GM Accessories)

* Aluminum Direct fit HD 52mm Radiator 

* Composite LS Air intake kit

* RpmExtreme Engine Cover (Truck engine only) 

* Cruise TAP GEAR + - Switch Upgrade

* Manual to Auto Brake Pedal upgrade (manual to Auto kits only) 



The premium kit comes with several aditional conversion components (over the base DIY kit) that you will need to get the engine into the Jeep, wired up, and running. 

This kit is for shops or customers that have mechanicical experience but dont want to have to fab up and bunch of stuff to complete the conversion. 


Aluminum radiator: Our direct fit 52mm aluminum radiators are designed to bolt into the Jeep JK using factory mounts and hardware all while acepting the stock fans and AC condensor. This is as simple as is gets. We also designed the radiator to match the LS engine configuration with inlets and outlets in the correct location as well as the steam port fitting. We have a few options based on your engine, (TRUCK) (LS3) our LS3 radiator is matched to the LS3 water pump and has the inlet and outlet in the correct position as well as a upper hose thats available over the counter at any parts store. Our Truck style radiator is matched to the truck water pump and is designed to give us extra room for our air intake to pass over the upper hose. This hose is also available at any parts store.


AC Hoses: Our AC hoses are a direct fit to the Jeep JK Evaporator at the firewall and condensor. The incorperate the stock Jeep AC pressure switch and high-low fittings. These hoses are built to fit a GM truck AC compressor running in the stock GM lower right side of the engine and run down the lower side of the radiator support for a nice clean look when you lift the hood. These hoses with also work with aftermarket compressors running in the lower right side of the engine. 


Air Intake: Our Air intake kit is made out of a composite material that helps reduce heat and yields less intake air temps compared to a aluminum system. We incorperate a MAF sensor mount and a breather port. We include all the couplers and clamps as well as a K&N filter. You will need a 15865791 credit card style MAF sensor


Computer Programer: We are including tuning software that will allow you to read and save your GM ECU-TCM calibration. You can then email it to us for modification. We will make you a custom tune and email back to you to flash into the Jeep. 


Optional or add on items: 


* Exhaust manifolds or LS JK custom Headers. 

Driveshafts: We can supply you with custom driveshaft to fit with the LS conversion. 

* GM ECU Computer. We can supply a E38 computer programmed to your application.

* Manual to Auto conversion kits.

* Transmission Cooler HD kit.

* Rear Exhaust kits. 2.5" or 3" from Y collector back.

* Primary "builders" exhaust kit (engine to Y collector). 

* Enclosed Air Box.

* More items will be added as we build them. 


If you have any questions or concerns please call before you place an order. 205-631-8225


Install Instructions Can Be Found HERE

Check out our Video HERE