Tundra 1-Inch Block and U-Bolt Kit: Rear Lift Install Steps
By Body Armor 4x4 | Published: 2026-11-01
Category: How-to Guides
A step-by-step guide to installing a 1-inch rear block and U-bolt kit on your 2007-2021 Toyota Tundra, with torque checkpoints and common mistakes to avoid.
Quick answer
To install a 1-inch block and U-bolt kit on your 2007-2021 Toyota Tundra, lift the rear axle, support the frame, and replace the factory U-bolts with the new blocks and hardware. Follow the torque sequence and re-check after 100 miles to keep the rear lift secure and maintain stock ride quality.
Why a 1-inch block is a practical leveling option
A 1-inch rear block raises the back of your Tundra just enough to reduce the nose-high stance that often appears after a front lift or heavier front accessories. Because the block is only 1 inch tall, it rarely requires longer shocks or brake line extensions, and it preserves the factory ride quality for daily driving.
This kit is designed for both 2WD and 4WD 2007-2021 Tundras, so you don't need to worry about drivetrain differences. The blocks are fabricated from 1/4-inch steel, which provides durability for occasional off-road use while keeping the installation straightforward.
When a 1-inch block might not be enough
If you frequently carry heavy loads or tow near the Tundra's maximum capacity, a 1-inch block may not provide enough rear lift to clear larger tires or maintain a level stance. In that case, consider a taller block or a add-a-leaf kit, but be aware that taller blocks can affect pinion angle and may require additional modifications.
Also, if your truck already has a rear lift block from the factory (some 4WD models do), stacking blocks is unsafe. This kit is intended to replace the factory block, not stack on top of it.
Step-by-step installation
- Prep the truck and gather tools: Park on a level surface, chock the front wheels, and loosen the rear lug nuts. Raise the rear of the truck and support the frame with jack stands. Place a jack under the axle to control its height. You'll need a torque wrench, socket set, penetrating oil, and safety glasses. Never work under a vehicle supported only by a jack; use rated jack stands.
- Remove the factory U-bolts and blocks: Spray penetrating oil on the U-bolt nuts and let it sit. Support the axle with the jack, then remove the U-bolt nuts and discard the factory U-bolts. Lower the axle slightly to remove the factory block (if equipped). Label or bag the factory hardware if you might reuse it; do not reuse U-bolts after removal.
- Install the new block and U-bolts: Set the new 1-inch block on the axle pad, aligning the center pin with the hole in the leaf spring. Raise the axle to seat the block, then install the new U-bolts over the axle tube and through the spring plate. Hand-tighten the nuts evenly. Make sure the block's center pin is fully seated in the spring pad; a misaligned pin can cause axle shift.
- Torque the U-bolts in a crisscross pattern: Lower the truck so the weight is on the tires, then torque the U-bolt nuts to the factory specification for your model year (consult your service manual; typically 70-80 ft-lbs for Tundra). Tighten in a crisscross pattern in stages to avoid uneven clamping. Re-torque the U-bolts after 100 miles of driving, as they can settle.
- Check brake lines and driveshaft clearance: With the truck on the ground, inspect the brake lines and parking brake cables to ensure they are not stretched or binding. Rotate the driveshaft by hand to check for interference with the new blocks or U-bolts. If any line is tight, reroute or extend it before driving.
- Test drive and re-check: Take a short test drive at low speed, listening for unusual noises. After 100 miles, re-torque the U-bolt nuts and check that the blocks remain properly seated. Skipping the re-torque can lead to loose U-bolts and unsafe axle movement.
Product facts
- 2007-2021 TOYOTA TUNDRA 2WD/4WD 1" BLOCK AND U BOLT KIT: Fabricated from 1/4-inch steel for durability. Thick steel resists deformation under load, so the blocks hold their shape and maintain proper axle alignment over time.
2007-2021 TOYOTA TUNDRA 2WD/4WD 1" BLOCK AND U BOLT KIT - 2007-2021 TOYOTA TUNDRA 2WD/4WD 1" BLOCK AND U BOLT KIT: Bolt-on installation for straightforward setup. No cutting or welding is required, so you can complete the install with basic hand tools in your garage.
- 2007-2021 TOYOTA TUNDRA 2WD/4WD 1" BLOCK AND U BOLT KIT: Preserves stock ride quality for everyday driving. You get the level stance you want without sacrificing comfort on daily commutes or highway trips.
