The Gen5 4Runner KDSS Checklist After a 2 to 3 Inch Lift
By Dom Ruangnol
A 2 to 3 inch lift is the most common first big mod on a fifth-generation 4Runner. It looks right, it clears a bigger tire, and most of the time the truck drives fine on day one. The trouble is that a KDSS truck has more going on under it than a plain sway bar setup, and a few things shift when you raise it. None of them are a reason not to lift. They are just worth checking on purpose instead of finding out at the trailhead.
Here is the checklist I would run on any KDSS Gen5 after a 2 to 3 inch lift.
Which 4Runner years have KDSS, 2010 to 2024?
KDSS on the 4Runner belongs to the fifth generation, which ran from 2010 to 2024. Not every Gen5 left the factory with it. It showed up on certain trims and option packages, so the quickest check is to look under the truck. A KDSS 4Runner has hydraulic lines running to cylinders at the front and rear sway bars, and a KDSS indicator on the dash. A non-KDSS truck has conventional sway bars and end links.
If you are new to the system and want the full picture of what those cylinders are doing, start with the parts and guides in our KDSS collection.
The fourth-generation 4Runner did not use KDSS, and the 2025 4Runner dropped it. So everything below applies to the fifth generation only.
What moves when you lift a KDSS truck?
When you lift a 4Runner, the frame goes up and the axles stay where they are. Every part that connects the two now sits at a different angle. On a KDSS truck, three of those changes matter most.
The rear track bar gets steeper. The track bar runs from the frame on one side to the axle on the other and keeps the axle centered. Raise the frame and the bar tilts. A steep bar pulls the axle sideways as the suspension moves, which shows up as a rear end that wanders, a truck that steps out over bumps, and an axle that no longer sits centered under the body. The fix is either flattening the angle with a correction bracket or recentering the axle with an adjustable bar like the Dr. KDSS Track Bar, which is machined from solid 7075 billet aluminum and adjusts to put the axle back where it belongs.
The rear KDSS strut and sway bar change position. The rear sway bar is tied to the axle and the KDSS strut is tied to the frame. Lifting the truck pulls them apart. That is why rear KDSS drop spacers exist: they reposition the strut so its piston stays in its factory operating range. On trucks that see harder trail use, the passenger-side fixed link is also a known weak point and can bend on a hard hit.
The hydraulic balance can shift. If the KDSS system closes its valves while the truck is twisted on jack stands or parked on uneven ground during the install, it holds that twist and the truck leans to one side. That is a hydraulic balance issue, not a geometry issue, and no bracket or spacer fixes it. The system has to be rebalanced on level ground.
What to check in the first 500 miles?
Most problems after a lift show up early. Run through this list at the first fill-up, again around 100 miles, and once more before 500.
- Re-torque the hardware. New suspension parts settle. Re-check torque on everything you touched after the first 100 miles, including track bar and correction kit bolts.
- Measure for lean. Park on level ground and measure from wheel center to fender lip at all four corners. A consistent difference side to side points to a KDSS balance issue.
- Check axle centering. Stand behind the truck and compare the gap between each rear tire and the body. If one side is visibly tighter, the track bar angle or length needs attention.
- Look at the rear sway bar and strut. Check that the sway bar is not contacting the track bar and that the rear KDSS strut is not sitting at an odd angle. Look at the passenger-side fixed link for any bend.
- Watch the dash. A KDSS warning light after a lift is worth chasing right away, not after the next trip.
- Get an alignment. Every lifted truck needs one once all of the suspension work is done.
- Drive it on a rough road. Listen for clunks over bumps and notice whether the rear feels like it is steering the truck. Both point back to track bar angle.
If item 2 turns up lean, the fix is rebalancing the KDSS on level ground. Some owners have a shop do it. Others add a KDSS control harness so they can open and close the valves from a switch and repeat the procedure themselves. The bundles collection has the KDSS Harness Combo, which packages the harness with the pieces it needs for a plug-in setup.
Frequently Asked Questions
Do I need new sway bar end links or adapters after a 2 to 3 inch lift?
The part to watch up front is the sway bar bushing angle. On a lifted KDSS truck, bushing bind typically starts around the 2 inch mark. Our KDSS front sway bar end adapters are built for 2 to 3 inches and up: they correct the bushing angle, keep the bar up high, and let the system cycle for full droop. Use them instead of a front KDSS drop spacer, not together with one.
Do I need rear KDSS drop spacers?
Drop spacers reposition the rear KDSS strut so the piston stays in its factory operating range after a lift. On trucks that wheel hard or run extended-travel rear shocks, the upgraded billet fixed link with a driver-side spacer goes a step further and replaces the weak factory link. Keep in mind that neither one fixes KDSS lean.
Why is the 2025 4Runner a different system?
The 2025 4Runner dropped KDSS, so parts and procedures built around the KDSS cylinders and lines do not carry over to it. The checklist above is for the 2010 to 2024 fifth generation only.
Should I fix the track bar or the KDSS balance first?
Install and torque all of the hardware first, including the track bar or correction kit. Rebalance the KDSS last, with the truck on level ground at its final ride height, so the system settles in the position you will actually drive it.
Is a 2 to 3 inch lift hard on KDSS?
Not when the parts around it are set up right. Most of the issues owners run into come from track bar angle, rear strut position, and a system that was balanced while the truck was twisted. Handle those three and a lifted KDSS 4Runner drives well.