PSC Jeep Wrangler TJ/LJ 4.0L High-Flow Power Steering Pump Kit 1997-2006
PK40JP2
The PSC Jeep Wrangler TJ/LJ 4.0L High-Flow Power Steering Pump Kit upgrades the factory steering pump system with increased hydraulic flow, a remote fluid reservoir, upgraded plumbing, and a dedicated steering cooler. Designed for 1997–2006 Jeep Wrangler TJ and 2004–2006 Wrangler Unlimited LJ models equipped with the 4.0L inline-six engine, this package provides the hydraulic supply needed for larger tires, upgraded steering components, and demanding off-road applications.
Available for either cylinder-assist steering or full hydraulic steering, the kit allows builders to match pump performance and plumbing to their steering system. The cylinder-assist version supports a conventional steering gearbox with an auxiliary hydraulic cylinder, while the full hydraulic version is designed to supply a hydraulic steering control valve and double-ended steering cylinder. Both configurations include a PSC high-performance pump, filtered remote reservoir, mounting bracket, hydraulic plumbing, dedicated fluid cooler, and PSC steering fluid. Proper cooling, clean fluid, and correct hose routing are essential to keeping the system responsive and reliable during slow-speed rock crawling and repeated steering loads.
Includes (Dependent on Customer Selection):
PK40JP2 – Cylinder Assist
- (1) PSC SP33362SJP High-Flow Power Steering Pump with Pulley
- (1) PSC CK215 Dual-Pass Fluid Cooler Kit
- (1) PSC HA-L138 Reservoir-to-Pump Hose Assembly
- (1) PSC HE80293 Pump-to-Steering Gear High-Pressure Hose Kit
- (1) PSC MR20K Remote Reservoir Mounting Bracket
- (1) PSC SR146-6-12 Remote Reservoir with Internal Filter
- (1) PSC SR-VT Anti-Splash / Pressure Relief Valve
- (1) PSC FL-SWE715-4PAK Power Steering Fluid Package
PK40JP2-FH – Full Hydraulic
- (1) PSC SP33352SJP Full Hydraulic Performance Pump
- (1) PSC SR146-8-12 8.25" Remote Reservoir with Internal Filter
- (1) PSC HA-L138 Reservoir-to-Pump Hose Assembly
- (1) PSC MR20K Remote Reservoir Mounting Bracket
- (1) PSC CK215-8 Heat Sink Fluid Cooler Kit
- (1) PSC SR-VT Anti-Splash / Pressure Relief Valve
- (1) PSC FL-SWE715-4PAK Power Steering Fluid Package
Important Notes:
- Select Cylinder Assist or Full Hydraulic based on your steering system.
- The included fluid cooler must be installed for proper system operation.
- Steering gearbox, assist cylinder, full hydraulic control valve, and steering cylinder are not included unless separately specified.
- Flush the steering system before installation and thoroughly bleed all air after assembly.
- Verify pump pulley alignment, belt compatibility, and hydraulic hose routing before operating the vehicle.
Specifications
| Specification | Details |
|---|---|
| Manufacturer | PSC Motorsports |
| Product Type | High-Flow Power Steering Pump Kit |
| Vehicle Platform | Jeep Wrangler TJ / LJ |
| Engine Application | Jeep 4.0L Inline-Six |
| Steering System Options | Cylinder Assist / Full Hydraulic |
| Pump Design | High-Flow Performance Power Steering |
| Reservoir Type | Remote Reservoir with Internal Filter |
| Reservoir Mounting | PSC MR20K Bracket |
| Fluid Cooling | PSC Dual-Pass / Heat Sink Cooler |
| Fluid Included | PSC 715 Power Steering Fluid |
| Installation | Vehicle-Specific Pump Upgrade with Custom Steering System Integration |
| Primary Application | Jeep Rock Crawling, Trail Riding & Custom Hydraulic Steering |
Variant Specifications
| Specification | PK40JP2 | PK40JP2-FH |
|---|---|---|
| System Type | Cylinder Assist | Full Hydraulic |
| Performance Pump | SP33362SJP | SP33352SJP |
| Remote Reservoir | SR146-6-12 | SR146-8-12 |
| Fluid Cooler | CK215 | CK215-8 |
| Reservoir Feed Hose | HA-L138 | HA-L138 |
| Pump-to-Gear Hose | HE80293 | Not Applicable |
| Steering Control | Mechanical Steering Gearbox | Hydraulic Steering Control Valve |
| Intended Cylinder | Hydraulic Assist Cylinder | Full Hydraulic Steering Cylinder |
Fitment
| Make | Model | Year Range | Engine Application |
|---|---|---|---|
| Jeep | Wrangler TJ | 1997–2006 | 4.0L Inline-Six |
| Jeep | Wrangler Unlimited LJ | 2004–2006 | 4.0L Inline-Six |
Common Applications:
- Jeep TJ and LJ rock crawlers
- Jeep builds running oversized tires
- Hydraulic cylinder-assist steering upgrades
- Full hydraulic steering conversions
- Custom steering axle and suspension builds
- Heavy-duty off-road and trail vehicles
Fitment Notes:
- Designed for compatible Jeep TJ/LJ 4.0L engine accessory configurations.
- PK40JP2 is intended for steering gearbox and hydraulic cylinder-assist applications.
- PK40JP2-FH is intended for full hydraulic steering systems using a compatible steering control valve and hydraulic cylinder.
- Verify pump mounting, pulley offset, belt alignment, and accessory-drive clearance before installation.
- Confirm the selected pump is compatible with the steering valve or gearbox, cylinder, and hydraulic system requirements.
- Mount the remote reservoir where the feed hose can supply the pump without restriction or excessive bends.
- The included cooler must be installed in the hydraulic return circuit according to PSC instructions.
- Route all hydraulic hoses away from exhaust heat, moving suspension components, tires, and sharp edges.
- Flush the existing steering system before installation to prevent contamination of the new pump and reservoir.
- Use PSC-approved steering fluid and thoroughly bleed the system before operating under load.
- Applications with modified engine accessories, nonstandard pulleys, or engine swaps require additional fitment verification.
Additional Components May Be Required:
- Compatible steering gearbox and assist cylinder for cylinder-assist systems
- Hydraulic steering control valve and steering cylinder for full hydraulic systems
- Application-specific steering hoses, fittings, or adapters
- Additional mounting brackets or hardware for custom installations
FAQ
What is the difference between PK40JP2 and PK40JP2-FH?
PK40JP2 is designed for a conventional steering gearbox with hydraulic cylinder assist. PK40JP2-FH is designed for full hydraulic steering systems that use a hydraulic control valve and steering cylinder instead of a conventional mechanical steering gearbox. The packages use different PSC pumps, reservoir configurations, and cooler components to match their intended steering applications.
Why upgrade the factory Jeep 4.0L power steering pump?
Larger tires, increased front axle weight, lockers, and demanding terrain place additional loads on the steering system. A high-flow performance pump helps supply the hydraulic fluid needed by upgraded steering components, particularly during slow-speed rock crawling where engine RPM is low and steering loads can be high.
Does this kit include everything needed for hydraulic steering?
No. These packages supply the performance pump, remote reservoir, cooling components, and associated plumbing for the selected steering configuration. The steering gearbox, assist cylinder, full hydraulic control valve, and steering cylinder must be selected separately as required by the complete steering system.
Why is a remote reservoir included?
A remote reservoir increases flexibility in steering system packaging while providing a dedicated fluid supply to the pump. The included internal filter helps manage fluid contamination, and proper reservoir placement supports consistent pump operation. The reservoir should be mounted and plumbed according to PSC's installation requirements.
Is the included steering cooler required?
Yes. PSC specifies a dedicated fluid cooler as part of these performance steering packages. Hydraulic steering systems can generate substantial heat during repeated steering inputs, slow-speed crawling, and high-load operation. The cooler helps control fluid temperature and protect the pump, seals, hoses, and other hydraulic components.
Will this pump kit fit a Jeep Wrangler TJ with a 2.5L engine?
This listing is specifically configured around the Jeep 4.0L engine and its accessory mounting arrangement. Do not assume direct compatibility with the 2.5L engine. Confirm the correct pump bracket, pulley, and belt configuration with PSC before ordering for a four-cylinder application.
Why is pulley alignment important during installation?
Incorrect pulley alignment can cause belt tracking problems, premature belt wear, pump bearing loads, and thrown belts. Verify pulley position, belt length, and clearance with the engine's complete accessory-drive system before final assembly.
How should the steering system be prepared before installing the new pump?
Flush the existing hydraulic system to remove old fluid and contamination. Install the pump, reservoir, cooler, and hoses using the correct fittings and routing. Fill with PSC-approved fluid, then follow the manufacturer's bleeding procedure to remove trapped air before operating the system under load. Aerated fluid can cause noise, inconsistent steering response, and pump damage.