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Suspension Lift Blocks & Leaf Spring U-Bolts

Whether you’re lifting or lowering your ride, suspension blocks are a great way to add a slick custom look to your leaf spring-equipped vehicle. If you want to add ride...

Whether you’re lifting or lowering your ride, suspension blocks are a great way to add a slick custom look to your leaf spring-equipped vehicle. If you want to add ride height, you can select from a range of suspension block sizes—including 2 inch, 3 inch, and 4 inch lift blocks (and beyond). Or, if you’re going for a pavement-scraping look, check out the range of lowering blocks in 1 inch, 2 inch, or 2.5 inch drops (or lower).

Some suspension blocks are sold individually, but you may want to consider picking up new leaf spring U-bolts too, if the kit doesn’t include them. This ensures that your U-bolts will be sized perfectly...

Whether you’re lifting or lowering your ride, suspension blocks are a great way to add a slick custom look to your leaf spring-equipped vehicle. If you want to add ride height, you can select from a range of suspension block sizes—including 2 inch, 3 inch, and 4 inch lift blocks (and beyond). Or, if you’re going for a pavement-scraping look, check out the range of lowering blocks in 1 inch, 2 inch, or 2.5 inch drops (or lower).

Some suspension blocks are sold individually, but you may want to consider picking up new leaf spring U-bolts too, if the kit doesn’t include them. This ensures that your U-bolts will be sized perfectly for your new suspension blocks, particularly if you’ve opted for a more aggressive suspension lift or drop, say, with something like a 6 inch lift block.

Suspension lift or lowering blocks work by adjusting how the rear axle rides on the leaf springs. For instance, in lowering applications, the suspension block often fits below the axle, but on top of the leaf spring. This pulls the axle up towards the body and chassis, resulting in a lower ride height. Conversely, the orientation is reversed for lift applications, moving the suspension blocks below the leaf springs, where they ride on top of the axle. This raises the chassis by moving the axle lower below the leaf spring.

Suspension lift or lowering blocks can be made from several materials, with aluminum, iron, and steel being the most common. As alluded to above, it’s possible that your stock U-bolts may still accommodate the addition of suspension blocks, but it makes sense to measure and make sure. Replacement leaf spring U-bolts are readily available, and a lot of the suspension block kits on this page include the U-bolts already.

Gearheads like suspension blocks because they’re an easy, straightforward way to raise or lower a leaf spring-equipped vehicle. If that sounds like you, check out all of your suspension block options here. While some suspension blocks are universal, many are application-specific, so you can ensure the proper fitment on the vehicle you’re raising or lowering. Make sense? Start shopping suspension blocks now, at Summit Racing.

Individual Parts

Results 1 - 25 of 165

Lift Blocks/U-Bolts, Cast Iron, 2 in. Lift, Rear, Ford, Jeep, SUV, Pickup, Kit

Part Number: SJA-BUK2071

5.0 out of 5 stars ( 1 )

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Lift Blocks, Rear, 1.0 in. Lift, Toyota, Kit

Part Number: EIB-S0124

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Leaf Spring Blocks, 2.25 in. Block, Cast Iron, Chevy, GMC, Kit

Part Number: RLS-66-3002

5.0 out of 5 stars ( 3 )

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Lift Blocks and U-Bolt Kits, Cast Iron, 2 in. Lift, Rear, Chevy, GMC, Kit

Part Number: TFY-97008

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Estimated Ship Date: Mar 26, 2026 if ordered today

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Estimated Ship Date: Mar 26, 2026 if ordered today

Suspension Blocks, PRO-TRUCK Rear 1.0" Lift Block

Part Number: EIB-S1085

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Suspension Lift, Leaf Spring Block, Cast Iron, Rear, 1.0 in., Chevy, GMC, Kit

Part Number: RLS-26-30100

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Suspension Blocks and U-Bolts, Cast Iron 2.0 in. Thick Blocks, Dodge, Ram, Rear, Kit

Part Number: RLS-66-1202

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Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

Suspension Blocks, Block, Steel, Black, 5.0 in. Lift, Rear, Chevy, Dodge, Ford, GMC, for Nissan, Toyota, Pair

Part Number: ROU-6596

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Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Suspension Blocks and U-Bolts, Cast Iron, 4.00 in. Thick, Ford, Rear, Pair

Part Number: RLS-66-2014

4.0 out of 5 stars ( 2 )

Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

Suspension Lift, Leaf Spring Block, Cast Iron, Rear, 4.0 in., Ford, Kit

Part Number: RLS-66-2024

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Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

Suspension Lift, Leaf Spring Block, Cast Iron, Rear, 2.5 in., Ford, Kit

Part Number: RLS-26-21250

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Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

Suspension Blocks, Block, Steel, Black, 4.0 in. Lift, Rear, Chevy, Dodge, Ford, GMC, for Nissan, Toyota, Pair

Part Number: ROU-6593

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Leaf Spring Blocks, 3.0 in. Block, Cast Iron, Chevy, GMC, Kit

Part Number: RLS-66-3003

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Lift Blocks/U-Bolts, Cast Iron, 4.5 in. Lift, Rear, Chevy, Dodge, GMC/Plymouth, SUV/Pickup, 4WD, Kit

Part Number: SJA-BUK4564

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Mar 30, 2026 if ordered today

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Estimated Ship Date: Mar 30, 2026 if ordered today

Lift Block, Rear, 1.0 in. Lift, Toyota, Kit

Part Number: RLS-66-5001

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 2, 2026 if ordered today

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Estimated Ship Date: Apr 2, 2026 if ordered today

Lift Block, Rear, 2.0 in. Lift, 4.0 in. Block, Ford, Pickup, Kit

Part Number: RLS-66-2094

4.0 out of 5 stars ( 4 )

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Suspension Blocks, Block, Steel, Black, 3.0 in. Lift, Rear, Chevy, Dodge, Ford, GMC, for Nissan, Toyota, Pair

Part Number: ROU-6594

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

Lift Block, Rear, 4.0 in. Lift Block, Ford, Kit

Part Number: RLS-26-21400

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Estimated Ship Date: Apr 2, 2026 if ordered today

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Estimated Ship Date: Apr 2, 2026 if ordered today

Suspension Block and U-Bolt Kit; 3.0 in. Block Kit; OEM Style Model Specific Rear Blocks; Includes Solid Cast

Part Number: RLS-66-2053

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 1, 2026 if ordered today

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Estimated Ship Date: Apr 1, 2026 if ordered today

Suspension Blocks, Lift Block Kits, Cast Iron, 4.50 in. Thickness, Rear Axle Position, without Trailer Tow Package, Ford, Kit

Part Number: SJA-BUK4593

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Estimated Ship Date: Mar 30, 2026 if ordered today

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Estimated Ship Date: Mar 30, 2026 if ordered today

Suspension Lift, Leaf Spring Block, Cast Iron, Rear, 2.0 in., Chevy, GMC, Kit

Part Number: RLS-66-3112

2.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Lift Blocks/U-Bolts, Cast Iron, 5.5 in. Lift, Rear, Ford, 4WD, Kit

Part Number: SJA-BUK5593

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

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Suspension Lift, Leaf Spring Block, Cast Iron, Rear, 5.0 in., Chevy, GMC, Kit

Part Number: RLS-26-3105

Not Yet Reviewed

Estimated Ship Date: Apr 2, 2026 if ordered today

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Estimated Ship Date: Apr 2, 2026 if ordered today

Suspension Blocks, Lift Block Kits, Cast Iron, 4.50 in. Thickness, Rear Axle Position, Chevrolet, GMC, Kit

Part Number: SJA-BUK4589

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Estimated Ship Date: Mar 30, 2026 if ordered today

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Estimated Ship Date: Mar 30, 2026 if ordered today

Suspension Lift, Leaf Spring Block, Cast Iron, Rear, 6.5 in., Ford, Kit

Part Number: RLS-26-2765

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Estimated Ship Date: Apr 2, 2026 if ordered today

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Estimated Ship Date: Apr 2, 2026 if ordered today