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.

Individual Parts

Part Groups

Results 1 - 25 of 502

Calvert Racing Lowering Blocks LB-01

Suspension Block, Lowering, 0.50 in. Thick, 2.25 in. Width, Rear Axle, 1/2 in. Centering Pin, Pair

Part Number: CLV-LB-01

4.83 out of 5 stars ( 12 )

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Classic Performance Lowering Block Kits CP4-2

Lowering Blocks, Rear Axle Position, Aluminum, 2.00 in. Thick, U-bolts, Chevy, GMC, Kit

Part Number: CLP-CP4-2

4.9 out of 5 stars ( 21 )

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Belltech Rear Block Kits 6203

Lowering Blocks, U-Bolts, Aluminum, 4 in., Rear, Chevy, GMC, Isuzu, Mitsubishi, for Nissan, Toyota, Kit

Part Number: BEL-6203

5.0 out of 5 stars ( 4 )

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McGaughy's Lowering Blocks 33123

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 )

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Belltech Rear Block Kits 6202

Lowering Blocks, U-Bolts, Aluminum, 3 in., Rear, Chevy, GMC, Isuzu, Mitsubishi, for Nissan, Toyota, Kit

Part Number: BEL-6202

4.46 out of 5 stars ( 13 )

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Allstar Performance Lowering Blocks ALL56061

Lowering Block, Aluminum, 1 in. Thick, 2.5 in. wide, 5 in. Long, 5/8 in, Pin Diameter, Each

Part Number: AAF-ALL56061

5.0 out of 5 stars ( 4 )

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Pro Comp Lift Blocks for 2011-2024 F-250 SUPER DUTY, F-350 SUPER DUTY - PCSFDLLR221-4

Suspension Blocks, 4 in. Steel, Rear, Ford, Kit

Part Number: EXP-PCSFDLLR2214

Not Yet Reviewed

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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

4.46 out of 5 stars ( 13 )

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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 )

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MaxTrac Suspension Lift Blocks 810010

Lift Blocks, Cast Iron, 1 in., Flat, Chevy, GMC, Pair

Part Number: MXT-810010

4.0 out of 5 stars ( 1 )

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Allstar Performance Lowering Blocks ALL56063

Lowering Block, Aluminum, 2 in. Thick, 2.5 in. wide, 5 in. Long, 5/8 in, Pin Diameter, Each

Part Number: AAF-ALL56063

5.0 out of 5 stars ( 2 )

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Allstar Performance Lowering Blocks ALL56132

Lowering Block, Aluminum, 2.00 in. Drop, Rear, 2.50 in. Wide, Universal, Each

Part Number: AAF-ALL56132

4.88 out of 5 stars ( 8 )

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McGaughy's Lowering Blocks 33119

Suspension Blocks, Lowering Blocks, 1.00 in. Thickness, Aluminum, U-bolts, Rear Axle Position, Chevrolet, GMC, Kit

Part Number: MMC-33119

Not Yet Reviewed

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Calvert Racing Lowering Blocks LB-02

Suspension Block, Lowering, 0.50 in. Thick, 2.25 in. Width, Rear Axle, 9/16 in. Centering Pin, Pair

Part Number: CLV-LB-02

5.0 out of 5 stars ( 1 )

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Allstar Performance Adjustable Lowering Blocks ALL56136

Lowering Block, Aluminum, 1.50 in. Drop, 2.50 in. Wide, Rear, Adjustable, Each

Part Number: AAF-ALL56136

4.75 out of 5 stars ( 4 )

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Belltech Rear Block Kits 6200

Lowering Blocks, U-Bolts, 3 in. Drop, 3 in Axle Tube Diameter, Rear, Kit

Part Number: BEL-6200

3.83 out of 5 stars ( 6 )

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Allstar Performance Lowering Blocks ALL56131

Lowering Block, Aluminum, 1.50 in. Drop, Rear, 2.50 in. Wide, Universal, Each

Part Number: AAF-ALL56131

4.45 out of 5 stars ( 11 )

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Belltech Rear Block Kits 6102

Lowering Blocks/U-Bolts, Aluminum, 2 in. Lift, 2.25 in. Wide, Rear, Universal, Kit

Part Number: BEL-6102

4.57 out of 5 stars ( 14 )

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Superlift Rear Block Kits 3027

Lift Blocks/U-Bolts, Cast Iron, 2 in. Lift, Rear, Chevy, GMC, Pickup/SUV, 4WD, Kit

Part Number: SLF-3027

5.0 out of 5 stars ( 3 )

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