Bruiser Conversions Frequently Asked Questions
What’s included in the base price of your body conversions?
The “STARTING AT” price listed for our body conversions is based upon the customer providing a suitable donor vehicle for the respective conversion and includes the following:
What is the best year/model Wrangler to purchase when planning to upgrade to an LS engine?
- Body Modification
- Frame Extension
- Extension of fuel and brake lines
- Extension of frame side wiring harness
- JK Crew: Choice of Fleet-Side or Step-Side bed
- JK Crew/Overlander/Honcho: Removable hard top with black exterior finish (requires OEM hard top freedom panels to be provided or purchased by the customer)
- Color matched paint
- JK Crew w/ Step-Side Bed: Front flat fenders to match integrated rear fenders
- Super Cab: Custom soft top
What is the best year/model Wrangler to purchase when planning to upgrade to an LS engine?
The most cost effective Wrangler with which to start is the 2012 and up JK/JKU Wrangler equipped with an automatic transmission. While early models may also be converted, they will require additional components to complete the LS engine conversion.
What else must be upgraded when an LS engine swap is done on my vehicle?
Early model JK/JKU Wrangler vehicles require replacement of the automatic transmission, center console, shifter, TCM, and transmission wiring harness. When the Bruiser parts are installed the rest of the Jeep comes alive with all correct data sent to Dash for tap shift, cruise control, and all other function that the jeep came from the factory with.
Beyond that, our fully integrated LS engine conversions are designed to work with your OEM components and have been engineered to retain the functionality of all factory installed options.
Can I keep my stock axles?
Yes, but for customers who engage in “extreme” or “aggressive” driving on a regular basis we do suggest upgrading your running gear.
Do I need to re-gear my axles?
Possibly. If you’ve re-geared your axles to compensate for larger tires, or intend to change the tire size during your conversion, we may recommend re-gearing your axles to ensure that your engine is operating within the proper RPM range.
How long of a wait is there for the JL LS conversion? (In House Only)
Currently the wait time for turn-key JL LS conversions is approximately 45 days from the date of scheduling.
How long of a wait is there for a fully integrated Do-It-Yourself JK LS Engine Conversion Kit?
Our standard lead time is two weeks from the date which payment is received for shipping of fully integrated JK LS engine conversion kits.
How long of a wait is there for an in house conversion for a JK?
Currently the wait time for in house, turn-key JK LS conversions is approximately 30 days from the date of scheduling.
If I agree to do an in house install what is the process?
Bruiser Conversions requires a $1,000.00 deposit to get your conversion on the shop schedule. Then, two weeks prior to your scheduled installation date, we require a payment for the parts necessary for your conversion. The balance of your invoice is due prior to pick up or return shipping of your vehicle.
If I order an engine conversion kit, what are your payment terms?
Payment for all engine conversion kits is due in full at the time of order placement.
Does sales tax apply to my order?
All in-house conversion customers that drop off or pick their vehicle at our facility are subject to Florida sales tax.
Is my engine conversion emissions compliant?
LS: Emissions compliance is determined by your local regulatory agency. The customer is responsible for ensuring that their conversion meets any local or state emissions laws prior to the conversion process.
R2.8: The Cummins R2.8 Turbo Diesel engine is for off-road use only in all vehicle model year 2000 and later. 1999 and earlier models are exempt from this restriction.
What is the difference between the Stage 1 and the Stage 2 fully integrated LS engine conversion options?
Power. The Stage 1 conversion provides a smooth idle and an excellent torque curve throughout the power band. We recommend this conversion when a driver intends to use their vehicle off-road in a rock crawling or on low speed trails that require smooth acceleration and bottom end torque.
The Stage 2 conversion is geared toward drivers who intend to keep their vehicles higher in the RPM range. The acceleration is more aggressive and the torque will come in later in the power band.
Does Bruiser Offer a fully integrated LS engine conversion with a supercharger?
Yes we do! We have 2 systems available:Stage 1 (LS3 Platform): 413 cubic inch - 620 HPStage 2: 427 cubic inch - 715 HP
(Supercharged conversions are done in house only and are tuned on our Dyno Jet during the installation process.)
What is the expected fuel economy for your LS conversion?
Stage 1 (450 HP): 15 MPG city / 17 MPG Highway (Average)*
Stage 2 (500 HP): 12 MPG city / 14 MPG Highway (Average)*
(*Test vehicles equipped with 35” Tire, 4.56 Gears, Automatic Transmission. Driving style and operational conditions may affect fuel economy.)
Will I have any issue insuring my newly converted vehicle?
Customers should consult with their insurance agency prior to starting the engine or body conversion process.
What difference will there be in the maintenance schedule for my vehicle after an LS3 Conversion? (Oil Change, Coolant, etc)
All routine maintenance schedules for your Jeep should be followed. We will provide you with a list of service parts and fluid capacities for the new LS engine upon delivery of your vehicle. The warranty information provided by GM Performance requires that you check the engine oil at every fuel fill up. The engine oil and oil filter should be changed every 3,000 miles, or less, depending on the severity of your driving conditions.
Do I need a different radiator with my JK LS engine conversion?
Not with the Bruiser Conversions fully integrated LS engine conversion system or the Cummins R2.8 Turbo Diesel engine conversion. Both rely on the factory radiator and each conversion includes radiator hoses to connect to the existing/factory radiator. If you have a high mileage vehicle we may suggest replacing your old part with a new OEM quality radiator.
Will the stock JK radiator keep my engine cool after the LS engine is installed?
Yes. The stock JK radiator, equipped with the late model JK cooling fan, is more than capable of handling the increased heat load from the LS engine.
However, your cooling system does require adequate air flow through the radiator to keep the engine at a safe operating temperature. If you have a big winch, or an aftermarket grille which restricts the OEM grille opening size, you may experience higher cooling system temperatures. This can typically be resolved by swapping the grille to one which is less restrictive or upgrading your front bumper to a style which allows the winch to be recessed below the grille opening.
Can I keep my manual transmission when installing a fully integrated LS engine conversion?
No. The stock NSG370 transmission will not survive after installing an LS engine. We do offer in house fully integrated LS engine conversions with an upgraded TR6060 6-speed manual transmission.
We do not offer a manual transmission based do-it-yourself kit at this time.
Do you modify my instrument cluster during a fully integrated JK LS conversion?
No. Our fully integrated LS engine conversions are fully integrated with the Jeep systems. Your instrument cluster will work as it did when your Jeep JK Wrangler rolled off the assembly line, without modification.
Do i need to send in my Jeep computer for recalibration when ordering a fully integrated LS engine conversion kit?
It is not required at the time of kit ordering. Every do-it-yourself engine conversion kit comes with a detailed list of core items that must be returned to Bruiser Conversions. These parts, which include the stock PCM, should be shipped back to our facility within one week after receipt of the engine conversion kit.
Do I need to modify my automatic transmission shifter for a fully integrated LS engine conversion?
Late model (2012+) JK/JKU Wrangler vehicles equipped with an automatic transmission will retain their current transmission shifter assembly. Early model (2007-11) vehicles will require a late model shifter to be installed.
Do I need to modify my engine harness when installing a fully integrated LS engine do-it-yourself kit?
No. Each kit comes with a replacement wiring harness.
Do I need a GM body control module when installing a fully integrated LS engine do-it-yourself kit?
No. Your factory installed systems will operate the Jeep’s body components.
Do I need to add a reluctor ring on the LS engine when installing a fully integrated do-it-yourself kit?
No. Each kit is shipped FULLY ASSEMBLED and requires no modification by the installer.
How do I recalibrate my speedometer?
JK Platform: Recalibration of the speedometer is done using an AEV ProCal module. This part may be purchased through Bruiser Conversions or any of AEV’s authorized dealers.
TJ Platform: If changing your axle gear ratio or tire size, the speedometer gear will need to be changed.
Will my ABS still work after a fully integrated LS engine conversion has been done on my vehicle?
Yes. All factory installed safety and convenience features will work after the conversion has been completed.
Will my AC still operate after my engine conversion?
JK Platform (Fully Integrated LS): If equipped with A/C from the factory, your conversion will include an air conditioning compressor and a complete set of A/C hoses to integrate with the OEM parts.
JK Platform (Cummins R2.8): If equipped with A/C from the factory, customers have the option of adding an air conditioning compressor, mega bracket, and a complete set of A/C hoses to their conversion. These parts will integrate with the OEM A/C system.
TJ Platform: If equipped with A/C from the factory, customers have the option of adding an air conditioning compressor and a complete set of A/C hoses to their conversion. These parts will integrate with the OEM A/C system.
Will I need aftermarket driveshafts after my conversion has been completed?
Maybe. This depends greatly on your chosen engine conversion and how your vehicle has been build (Lift height, Tire Size, Axles, etc.).
2-door JK Wrangler Driveshafts: 2-door vehicles will require aftermarket driveshafts and adjustable rear lower control arms during an LS engine conversion. This is due to the short wheel base and the increased length of the engine/transmission assembly.
4-door JKU Wrangler Driveshafts: Jeeps equipped with stock driveshafts and axles may not require aftermarket driveshafts. The ability to use stock driveshafts will be determined by your suspension and axle configuration. We do, however, recommend upgrading them if you intend to subject your vehicle to “extreme” driving conditions or plan to run a large tire (37”+). Vehicles already equipped with aftermarket driveshafts will require modification or replacement of their existing driveshafts.
How does the tap-shift feature work with in my JK after a fully integrated LS engine conversion?
The tap shift feature is incorporated into the late model (2012+) JK/JKU automatic transmission shifter assembly. When in the “D” position, you will tap left to select a lower gear or tap right to engage higher gears. Hold the shifter to the right to return to automatic mode. If you exceed the “forced shift” RPM, the TCM will automatically engage the next higher gear to prevent damage to the engine or transmission.
Will my Rubicon transfer case work with your fully integrated LS engine conversion?
Yes. When scheduling your conversion you will complete a vehicle information sheet. This provides our team the information necessary to compile the correct parts manifest for your conversion.
Will my factory installed Rubicon lockers still work?
Yes. Your OEM switches will operate the lockers found in OEM Rubicon axles. If your OEM lockers worked prior to the conversion, they will work once it’s complete.
Will my factory installed Rubicon sway bar disconnect still work?
Yes. Your OEM switch will operate the electronic swaybar disconnect found in Rubicon models. If your OEM electronic swaybar disconnect worked prior to the conversion, it will work once it’s complete.
Will my remote start still work after my fully integrated LS engine conversion is completed?
Yes. If your OEM remote start system was active before the conversion it will remain operational after the fully integrated LS engine conversion has been completed.
What type of fluids should I use when maintaining my engine conversion?
A service parts manifest, including fluid specifications, is provided with your conversion. All fluids must meet or exceed the part manufacturer’s specifications. A complete record of all service must be kept showing the date, mileage, and location of all service. This information must accompany all warranty claims.
What accessories drive components will be used with my engine?
Bruiser Conversions’ fully integrated LS engine conversions come fully assembled with the accessories drive components. Each part is OEM quality and a full service parts manifest is provided with your conversion.
What is a CAN bus?
A Controller Area Network (CAN bus) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in applications without a host computer. It is a message-based protocol, designed originally for multiplex electrical wiring within automobiles to save on copper, but is also used in many other contexts.
What difference will there be in the maintenance schedule for my vehicle after a Cummins R2.8 Conversion? (Oil Change, Coolant, etc)
The vehicle Owner/Driver is responsible for the operation and maintenance of the Cummins R2.8 Turbo Diesel engine as specified in the applicable Cummins Operation and Maintenance Manual. This manual will be provided at the completion of your installation. Other routine maintenance schedules for your vehicle can be found in your vehicle Owner's Manual.
Will my Cummins R2.8 Turbo Diesel engine conversion require the use of DEF?
No. DEF is injected into the exhaust system on many modern vehicles, but will not be required in conjunction with your engine conversion.
Can I perform an EGR delete on my Cummins R2.8 Turbo Diesel engine conversion?
Exhaust gas recirculation (EGR) is an effective strategy to control NOx emissions from diesel engines. The EGR reduces NOx through lowering the oxygen concentration in the combustion chamber, as well as through heat absorption. Modification of the EGR system, or other conversion components, will affect warrantycoverage.
What is the expected fuel economy for your Cummins R2.8 Turbo Diesel engine conversion?
JK: low/mid 20s*
TJ: High 20s*
(*Test vehicles equipped with 35” Tires, 4.10 Gears, Automatic Transmission. Driving style and operational conditions may affect fuel economy.)