Dial in front-end support without giving up daily ride control
King Shocks 25001-419A is a vehicle-tuned front coilover pair for the GX550 Overtrail, combining 2.5-inch bodies, external reservoirs, adjustable ride height, and 20-position compression adjusters. The system increases fluid capacity and wheel control while retaining serviceable construction.
Key Features
- Exact 25001-419A GX550 Overtrail configuration
- Matched front coilover pair
- 2.5-inch bodies with external reservoirs
- Adjustable ride height and increased wheel travel
- 20-position wide-range compression adjusters
- Extruded 6061-T6 aluminum construction
- Vehicle-specific dynamometer and real-world tuning
- Fully rebuildable, serviceable, and tunable
Fitment
| Years |
Make |
Model |
Trim |
Drivetrain |
Position |
Verified Notes and Exclusions |
| 2024-2026 |
Lexus |
GX550 |
Overtrail |
2WD or 4WD |
Front |
Use complete adjustable 25001-419A pair; Overtrail only, with other trims excluded |
Specifications
| Detail |
Value |
| Manufacturer Part Number |
25001-419A |
| Product Type |
Adjustable front remote-reservoir coilover pair |
| Body Diameter |
2.5 inches |
| Compressed Length |
18.181 inches |
| Extended Length |
24.558 inches |
| Stroke |
6.377 inches |
| Published Gas Pressure |
150 psi |
| Position |
Front |
| Quantity |
Two coilovers |
| Compression Adjustment |
20 positions |
| Material |
Extruded 6061-T6 aluminum |
What's Included
- Two King Shocks 25001-419A front coilovers
- Two external reservoirs with compression adjusters
- Coil springs and vehicle-specific reservoir mounting components
- Installation instructions and hardware supplied in the sealed King package
About King Shocks
King Shocks develops rebuildable off-road dampers with large fluid volumes, precision-machined components, and application-specific testing. OEM Performance coilovers combine vehicle-tuned damping with serviceability and external-reservoir heat capacity.
Related Parts
- King rear shocks specified for the same GX550 configuration
- King sway bar links verified for the GX550 platform
- Alignment and suspension hardware selected for the final ride height
FAQ
What is the 25001-419A?It is a matched pair of adjustable 2.5-inch front remote-reservoir coilovers for the 2024-2026 Lexus GX550 Overtrail.
Which GX550 trim is supported?King lists the Overtrail application only; other GX550 trims are not claimed.
How many coilovers are included?The package contains a matched front pair with remote reservoirs, springs, and compression adjusters.
What are the published lengths?King publishes an 18.181-inch compressed length, 24.558-inch extended length, and 6.377-inch stroke.
What gas pressure is specified?King publishes 150 psi for this exact configuration; service requires the correct dry-nitrogen equipment and procedure.
Can ride height be adjusted?Yes. King lists adjustable ride height, but final settings must preserve safe suspension, CV, steering, and alignment geometry.
What do the adjusters control?The reservoir knobs provide 20 compression-damping positions from softer to firmer response.
Are the coilovers rebuildable?Yes. King describes the kit as fully rebuildable, serviceable, and tunable.
Installation Instructions
- Confirm the vehicle is a supported GX550 Overtrail and compare the sealed kit contents with the King instructions.
- Park on a level surface, chock the wheels, and support the chassis and front suspension with appropriately rated equipment.
- Remove the original front assemblies while protecting brake hoses, wiring, steering components, and CV joints.
- Install each coilover and reservoir on its corresponding side without twisting or sharply bending the hoses.
- Set both spring seats and compression adjusters evenly, then torque all hardware to King and Lexus specifications.
- Cycle steering and suspension through full travel to verify tire, hose, reservoir, CV, and chassis clearance.
- Perform a professional alignment, road-test at low speed, and recheck all mounts and fasteners after the initial driving interval.
California Proposition 65 Warning: Motor vehicle parts can expose you to chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling and follow applicable safety procedures.
