Leaf Spring U-Bolts

One of the unsung heroes of any leaf spring suspension upgrade, the humble leaf spring U-bolt has a very important job. The U-bolt keeps the leaf spring secure to the...

One of the unsung heroes of any leaf spring suspension upgrade, the humble leaf spring U-bolt has a very important job. The U-bolt keeps the leaf spring secure to the axle, ensuring proper axle position and maintaining the right suspension geometry and driveline angles.

Yet it’s easy to overlook the need for replacing or upgrading the leaf spring U-bolts in your suspension system. Unless of course, you’re running a modified suspension or non-stock front or rear axle. In those cases, you may need longer or wider leaf spring U-bolts to fit. For instance, adding lift blocks or lowering blocks to your axle could demand 4-inch, 8-inch or even longer leaf spring U-bolts. That’s because the U-bolt will have to compensate for the block, demanding extra length on the leaf spring U-bolt, so you still have enough thread length to secure the U-bolt nuts.

But even if you’re not adding lowering or lift blocks, running an aftermarket spring pack may require longer leaf spring U-bolts too, particularly if the spring pack features additional leaf or helper springs. Additional springs can increase the overall width of the spring pack, meaning that you may be unable to reuse the stock leaf spring U-bolts. So, if you’re upgrading leaf springs, take some measurements to determine if you’ll need new leaf spring U-bolts and, if so, how much longer those U-bolts need to be to complete your leaf spring installation.

If you’re simply swapping out stock parts for new ones, replacing your original leaf spring U-bolts may not be a bad idea either. Given their position on the vehicle, the threads on the end of your front or rear axle U-bolts are often exposed to the worst of what the road has to offer. Mud, salt, large rocks—there are plenty of road hazards that can severely damage your leaf spring U-bolt threads, or bend and distort the ends of the U-bolts entirely. Even up top where they wrap around the axle, your leaf spring U-bolts may be worn, corroded, or otherwise degraded to the point where you’ll need to replace them.

Standard or long, front or rear axle, whatever leaf spring U-bolts you need for your ride, you’ll find them right here, at Summit Racing.

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Superlift U-Bolt Kits 3318

U-Bolts, Steel, Zinc Finish, Round-Style, Front, Chevy, GMC, Set of 4

Part Number: SLF-3318

4.57 out of 5 stars ( 49 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11334

U-Bolts, Steel, Black, 5/8 in. Diameter, 8 in. Length, Round-Style, 3 3/8 in. Axle Tubes, Set

Part Number: SLF-11334

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 3418

U-Bolts, Steel, Black, Round-Style, Front, Chevy, Dodge, GMC, Pickup, Kit

Part Number: SLF-3418

2.18 out of 5 stars ( 11 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11384

U-Bolts, Steel, Black, 5/8 in. Diameter, Round-Style, Chevy, GMC/Universal, Rear, Set of 4

Part Number: SLF-11384

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11114

Axle U-Bolt; U-Bolt; Square; 4 U-Bolts; 0.625 in. x 2.5 in. x 14 in.; w/Nuts And Washers

Part Number: SLF-11114

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11184

U-Bolts, Steel, Black, 5/8 in. Diameter, 8 in. Length, Round-Style, 3 1/8 in. Axle Tubes, Set of 4

Part Number: SLF-11184

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10524

Axle U-Bolt; U-Bolt; Square; 4 U-Bolts; 0.5625 in. x 2.5 in. x 13 in.; w/Nuts And Washers

Part Number: SLF-10524

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10404

Kit 4 U-Bolts W/Nuts & Washers 9/16" x 2.5" x 7" Square Bend

Part Number: SLF-10404

4.75 out of 5 stars ( 12 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10624

Axle U-Bolt; U-Bolt; Square; 4 U-Bolts; 0.5625 in. x 3 in. x 11 in.; w/Nuts And Washers

Part Number: SLF-10624

4.8 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11004

U-Bolts, Steel, Black, Square-Style, Rear, Chevy, GMC, Pickup, Universal, Set of 4

Part Number: SLF-11004

4.45 out of 5 stars ( 11 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11364

U-Bolts, Steel, Black, 5/8 in. Diameter, Round-Style, Chevy, GMC/Universal, Rear, Set of 4

Part Number: SLF-11364

4.5 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10764

U-Bolts, Steel, Black, 9/16 in. Diameter, Round-Style, Ford, Pickup, Universal, Rear, Set of 4

Part Number: SLF-10764

4.33 out of 5 stars ( 12 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10104

U-Bolts, Steel, Black, 1/2 in. Diameter, Round-Style, Set of 4

Part Number: SLF-10104

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10464

U-Bolts, Steel, Black, Square-Style, Rear, Dodge, Plymouth, Pickup, Universal, Set of 4

Part Number: SLF-10464

4.89 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11264

U-Bolts, Steel, Black, 5/8 in. Diameter, Round-Style, Chevy, GMC/Universal, Rear, Set of 4

Part Number: SLF-11264

3.75 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10604

Kit 4 U-Bolts W/Nuts & Washers 9/16" x 3" x 9" Square Bend

Part Number: SLF-10604

4.54 out of 5 stars ( 13 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10504

Kit 4 U-Bolts W/Nuts & Washers 9/16" x 2.5" x 12" Square Bend

Part Number: SLF-10504

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11604

U-Bolts, Steel, Black, Round-Style, Ford, Universal, Rear, Set of 4

Part Number: SLF-11604

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10914

Axle U-Bolts, Steel, Black, Ford, 4WD, Set of 4

Part Number: SLF-10914

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Nov 16, 2026 if ordered today

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Estimated Ship Date: Nov 16, 2026 if ordered today

Superlift U-Bolt Kits 11244

U-Bolts, Steel, Black, 5/8 in. Diameter, Round-Style, Ford/Chevy, GMC/Universal, Rear, Set of 4

Part Number: SLF-11244

4.6 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 10984

Kit 4 U-Bolts W/Nuts & Washers 5/8" x2.5" x 9" Square Bend

Part Number: SLF-10984

4.0 out of 5 stars ( 5 )

Estimated Ship Date: Nov 16, 2026 if ordered today

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Estimated Ship Date: Nov 16, 2026 if ordered today

Superlift U-Bolt Kits 11104

Kit 4 U-Bolts W/Nuts & Washers 5/8" x 2.5" x 13" Square Bend

Part Number: SLF-11104

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Superlift U-Bolt Kits 11734

U-Bolt, Steel, Black, 5/8 in. Diameter, Large Radius Style, 19 in. Length, Universal, Set of 4

Part Number: SLF-11734

Not Yet Reviewed

Estimated Ship Date: Nov 16, 2026 if ordered today

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Estimated Ship Date: Nov 16, 2026 if ordered today

Superlift U-Bolt Kits 11724

U-Bolt, Steel, Black, 5/8 in. Diameter, Large Radius Style, 17 in. Length, Universal, Set of 4

Part Number: SLF-11724

Not Yet Reviewed

Estimated Ship Date: Nov 16, 2026 if ordered today

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Estimated Ship Date: Nov 16, 2026 if ordered today

Superlift U-Bolt Kits 10544

Axle U-Bolt

Part Number: SLF-10544

Not Yet Reviewed

Estimated Ship Date: Nov 16, 2026 if ordered today

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Estimated Ship Date: Nov 16, 2026 if ordered today

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