A 2- to 3-inch suspension lift suits most 2003–2009 4Runners; past 3 inches, brake lines, alignment range, and driveline angles need attention too.
Most bad 4Runner lift builds fail at the order form, not on the trail. Kits get sold as fitting “a 4Runner,” and then the truck turns out to have factory hardware the kit explicitly excludes.
The 2003–2009 generation is the one people mean by 4th gen, and its suspension splits three ways: standard coils, X-REAS (the cross-linked shock system), and rear air leveling. Two of those three rule out the most common 3-inch kits, so read the door tag before you read a spec sheet.
For a daily driver that sees moderate dirt, 2 to 3 inches of suspension lift is the practical range. Here is what each step up adds to the parts bill.
How Much Lift Does A 4th Gen 4Runner Need?
Two to three inches covers a daily driver that runs moderate trails; taller lifts start spending suspension travel and alignment range for height you may never use.
- 1.5 to 2.5 inches: leveling and mild clearance. Usually front spacers only, with the factory rear springs left alone.
- About 3 inches: a genuine suspension lift. Revtek’s kit, part 431, is listed for 2003–2009 SR5 and Sport models without air leveling and without X-REAS. Revtek’s installation document for part 431 lists every piece and the torque chart.
- Over 3 inches: plan on checking upper-control-arm clearance, alignment range, CV-axle angles, brake-line length, bump-stop contact, and driveshaft angles. No source sets one ceiling for every truck — the limit depends on your configuration.
4th Gen 4Runner Lift Sizing: Parts By Height
A lift is a system, not a spacer. At 3 inches the hardware list grows because the kit has to restore what the taller stance takes away: stud length, droop travel, and brake-line slack.
| Lift Or Part | When It Applies | What To Know |
|---|---|---|
| Front spacer, 1.5–2 in | Leveling only | Rear springs stay stock; alignment still required |
| Front and rear spacers, 2–2.5 in | Mild clearance gain | Check brake-line slack at full droop |
| Revtek 431, 3 in | 2003–2009 SR5 and Sport, no X-REAS, no air leveling | Preload spacers, top-out extenders, rear coil spacers, R2515S shocks |
| 10-mm top-plate studs | Any kit running preload spacers | Longer studs replace the stock units |
| Brake-line bracket hardware | Rear, 3 in and up | M8 × 50-mm bolt, washer, and steel tube spacer |
| Aftermarket upper control arms | When alignment cannot reach spec | Common above 3 in, sometimes needed at 3 in |
| Alignment and retorque | Every lift | Caster, camber, and toe all shift; hardware settles |
Torque matters as much as parts.
Fitment Traps And The Order That Works
The expensive mistakes happen at the keyboard, not behind the wheel — a kit that excludes your factory hardware, tires assumed to fit, and an alignment skipped once the truck is back on the ground.
Running through a roundup of 4th gen 4Runner mods worth buying before you order saves a second shipping charge later.
- Treating advertised tire fitment as a guarantee. Revtek calls its wheel and tire fitments guidelines only, because production tolerances differ truck to truck.
- Reusing stretched, corroded, or single-use fasteners.
- Skipping brake-line, ABS-wiring, and breather-line checks through full suspension travel.
- Testing tire rub in a flat parking lot instead of at full steering lock and full compression.
- Driving away without a retorque and without listening for driveline vibration.
Then work in this order:
- Match year, trim, drivetrain, X-REAS, and air leveling against the manufacturer’s application chart.
- Cycle the suspension and measure brake-line and wiring slack before anything goes on.
- Compress coil springs only with a proper spring compressor — a released coil can cause severe injury — and follow the maker’s sequence for the front struts and rear spacers.
- Align it. Caster, camber, and toe all change, and some trucks need aftermarket upper control arms to reach spec.
- Retorque wheels and suspension hardware after the first drive, then recheck.
FAQs
Can You Lift A 4Runner That Has X-REAS?
You can, but not with the common off-the-shelf 3-inch kits. The Revtek part 431 application explicitly excludes vehicles with X-REAS and vehicles with rear air leveling, so those trucks need a different approach or a system that removes and replaces the cross-linked shocks. Verify the specific kit against your trim and factory equipment before buying anything.
Do You Need New Upper Control Arms At 3 Inches?
Only if the truck cannot reach factory alignment specs after the lift. Caster and camber shift as the front comes up, and stock arms sometimes run out of adjustment range. Have the shop align it and report the numbers. If they cannot hit spec, aftermarket arms with more adjustment are the fix, not a taller lift.
Does A Lift Kit Tell You What Tire Size Fits?
No, and the numbers are not interchangeable. Lift height and tire clearance are separate problems: wheel offset, tire construction, suspension compression, steering lock, fender liners, and production tolerances all decide whether a tire rubs. Revtek states its fitments are guidelines only. Test at full steering lock and full compression, not in a flat parking spot.
References & Sources
- Revtek Industries. “Installation Instructions for 2003–2009 Toyota 4Runner SR5 and Sport, 3-inch Suspension Lift Kit, Part Number 431.” Source for fitment exclusions, included hardware, and torque values.
- ReadyLIFT. “Toyota 4Runner Lift Kits.” Lists the +3-inch SST kit covering 2003–2013 4Runner and FJ Cruiser at $453.15.
- LC Engineering. “4th Generation 4Runner (2003–2009) Suspension.” Confirms the 2003–2009 model-year span for the fourth generation.