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 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.

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Results 1 - 25 of 97

UMI Performance Leaf Spring Lowering Blocks for 1970-1981 CAMARO, FIREBIRD - 2621-2

Suspension Blocks, Leaf Spring Lower Blocks, GM F-Body, 1.0 in. Thick, Aluminum, Black Finish, includes U-bolts, Washers, Nuts, Chevy, Pontiac, Pair

Part Number: UPI-2621-2

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Calvert Racing Multi-Leaf Spacer Kits SP-1

Suspension Blocks, Multi-Leaf Spacers, Steel, 0.50 in. Thickness, Rear Axle Position, Set of 4

Part Number: CLV-SP-1

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Tomorrow

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Daystar Leaf Spring Block Kits for 2005-2019 F-250 SUPER DUTY, F-350 SUPER DUTY - KF09053

Leaf Spring Blocks, Rear Axle Position, Steel, 2.00 in. Thick, Ford, Kit

Part Number: DYS-KF09053

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Calvert Racing Mono-Leaf Spacer Kits SP-3

Suspension Blocks, Mono-Leaf Spacers, Steel, 0.25 in. Thickness, Rear Axle Position, Pair

Part Number: CLV-SP-3

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Scott Drake Rear-End Lowering Kits for 1964-1966 MUSTANG - C5ZZ-5705-LK1

Leaf Spring Blocks, Rear-End Lowering, Aluminum, 1.00 in. Block Thickness, U-bolts, Ford, Kit

Part Number: SDK-C5ZZ5705LK1

3.86 out of 5 stars ( 14 )

Estimated Ship Date: Tomorrow

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Scott Drake Rear-End Lowering Kits for 1967-1970 MUSTANG - C7ZZ-5705-LK1

Leaf Spring Blocks, Rear-End Lowering, Aluminum, 1.00 in. Block Thickness, U-bolts, Ford, Kit

Part Number: SDK-C7ZZ5705LK1

3.6 out of 5 stars ( 15 )

Estimated Ship Date: Tomorrow

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Belltech Rear Block Kits 6002

Lowering Blocks/U-Bolts, Aluminum, 1 in. Lowering, For 2.5/3.0 in. Wide Leaf Springs, Rear, Universal, Kit

Part Number: BEL-6002

4.5 out of 5 stars ( 14 )

Estimated Ship Date: Tomorrow

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ReadyLift Suspension Rear Block Kits 66-3112

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: Tomorrow

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ReadyLift Suspension Rear Block Kits for 2021-2025 F-150 - 26-21250

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

Part Number: RLS-26-21250

Not Yet Reviewed

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

ReadyLift Suspension Rear Block Kits 66-3003

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

Part Number: RLS-66-3003

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2011-2016 F-250 SUPER DUTY, F-350 SUPER DUTY, F-450 SUPER DUTY - 66-2024

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

Part Number: RLS-66-2024

Not Yet Reviewed

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

ReadyLift Suspension Rear Block Kits 26-30100

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

Part Number: RLS-26-30100

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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ReadyLift Suspension Rear Block Kits 66-3002

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

Part Number: RLS-66-3002

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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ReadyLift Suspension Rear Block Kits for 2014-2018 SIERRA 1500, SILVERADO 1500 - 26-3105

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: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2014-2018 SIERRA 1500, SILVERADO 1500 - 26-3104

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

Part Number: RLS-26-3104

Not Yet Reviewed

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

ReadyLift Suspension Rear Block Kits 66-2295

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

Part Number: RLS-66-2295

Not Yet Reviewed

Estimated Ship Date: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

ReadyLift Suspension Rear Block Kits 26-3204

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

Part Number: RLS-26-3204

Not Yet Reviewed

Estimated Ship Date: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2014-2018 SIERRA 1500, SILVERADO 1500 - 26-3460

Suspension Lift, Leaf Spring Block, Cast Iron, Rear, 6.0 in., Chevy, GMC, Kit

Part Number: RLS-26-3460

Not Yet Reviewed

Estimated Ship Date: Feb 13, 2026 if ordered today

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Estimated Ship Date: Feb 13, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2017-2025 F-450 SUPER DUTY, F-350 SUPER DUTY, 2017-2024 F-250 SUPER DUTY - 26-2752

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

Part Number: RLS-26-2752

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

ReadyLift Suspension Rear Block Kits 26-3205

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

Part Number: RLS-26-3205

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

ReadyLift Suspension Rear Block Kits 26-3950

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

Part Number: RLS-26-3950

Not Yet Reviewed

Estimated Ship Date: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2017-2025 F-250 SUPER DUTY, F-350 SUPER DUTY - 26-2766

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

Part Number: RLS-26-2766

Not Yet Reviewed

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2011-2016 F-250 SUPER DUTY, F-350 SUPER DUTY, F-450 SUPER DUTY - 66-2025

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

Part Number: RLS-66-2025

Not Yet Reviewed

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2011-2017 F-250 SUPER DUTY, F-450 SUPER DUTY, 2011-2016 F-350 SUPER DUTY - 66-2222

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

Part Number: RLS-66-2222

Not Yet Reviewed

Estimated Ship Date: Feb 11, 2026 if ordered today

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Estimated Ship Date: Feb 11, 2026 if ordered today

ReadyLift Suspension Rear Block Kits for 2015-2022 CANYON, COLORADO - 66-3510

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

Part Number: RLS-66-3510

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

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