Symptoms
Not a fault. You want more sidewall and clearance than the factory tires provide.
The fix, step by step
- Owners report 265/70R18 on factory suspension and many running 275/70R18 (about 33.2 in) without modification.
- One GX 550 owner runs 275/70R18 KO3s on stock wheels with an 8 mm top shock spacer and billet rear lower control arms and has no rub at full articulation. 285/70 is where rubbing starts. 35s generally need a small level or lift, and one owner of the twin LC250 runs 35x11.50R18 with a 1.5-in front lift and a 15 mm rear spacer.
Tools & part numbers
- Floor jack
- stands
- spring compressor if using spacers
- torque wrench
- alignment afterward
Where to buy the parts
OME upper control arms, LX 600/GX 550/LC 250 (pair)Slee Off-Road ↗Amazon ↗
OME MT64 1.5–2 in low lift, LC 250/GX 550Slee Off-Road ↗Amazon ↗
DuroBumps rear bump stop kit, LC 250/GX 550Slee Off-Road ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Lexus GX 550 parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.