SMX-153015 SUSPENSIONMAXX Rear Block Bolt Kit 1500 4X4 Sierra

Review SUSPENSIONMAXX Suspensionmax 1.5 Inch Rear Block And U-bolt Kit For for SILVERADO SIERRA 1500 4X4 1999–2007

Introducing the SuspensionMaxx SMX-153015 1.5 Rear Block U-Bolt Kit, specifically designed for the 99-07 Silverado and Sierra 1500 4x4 models. This premium u-bolt kit is an essential upgrade for those seeking improved performance, durability, and enhanced towing capacity.

The SMX-153015 kit comes with three high-strength, heat-treated steel u-bolts, each boasting a 1.5-inch diameter. These u-bolts are engineered to securely hold your rear suspension components in place, ensuring optimal performance and stability. The u-bolts are also coated with a protective zinc finish, which resists corrosion and prolongs the life of the kit.

This SuspensionMaxx kit features an innovative design with an additional rear block. The rear block is designed to prevent the u-bolts from twisting under heavy loads, ensuring a more stable and secure connection between the suspension components and the chassis. The rear block also allows for easier installation and adjustment of the u-bolts.

The SMX-153015 kit is an excellent choice for those who tow heavy loads or require additional stability and support for their vehicle. The u-bolts are rated for a maximum capacity of 20,000 pounds, providing peace of mind for even the most demanding towing situations.

Installation of the SMX-153015 kit is straightforward and can be completed in a few hours with standard hand tools. The kit includes clear and concise installation instructions to ensure a hassle-free installation process.

Investing in the SuspensionMaxx SMX-153015 1.5 Rear Block U-Bolt Kit is a smart choice for any Silverado or Sierra 1500 4x4 owner seeking improved performance, durability, and towing capacity. With its high-strength materials, innovative design, and easy installation, this kit is a must-have upgrade for any serious off-roader or towing enthusiast.

Pros and Cons of buying a SuspensionMaxx SMX-153015 1.5 Rear Block U-Bolt Kit for 1999-2007 Silverado/Sierra 1500 4x4

The SuspensionMaxx SMX-153015 1.5 Rear Block U-Bolt Kit is a popular aftermarket solution for addressing the common issue of worn-out u-bolts in the rear suspension system of 1999-2007 Silverado/Sierra 1500 4x4 vehicles. While there are benefits to upgrading to this kit, it's essential to weigh the pros and cons before making a purchasing decision.

1. Improved Ride Quality: The SMX-153015 kit offers a more substantial and stable connection between the rear axle and the frame, potentially resulting in a smoother and more comfortable ride.

2. Durability: By upgrading to a stronger u-bolt kit, the components can withstand increased loads, off-road conditions, and the test of time.

3. Easy Installation: The kit comes with clear instructions and all necessary hardware, making the installation process relatively straightforward and accessible for most DIY enthusiasts.

4. Affordability: Compared to other aftermarket alternatives, the SuspensionMaxx SMX-153015 kit is a cost-effective solution for improving the rear suspension system on a 1999-2007 Silverado/Sierra 1500 4x4.

1. Additional Cost: While the SMX-153015 kit is more affordable than some alternatives, it still represents an additional expense for vehicle owners.

2. Potential for Over-Tightening: During installation, it's crucial to avoid over-tightening the u-bolts to ensure proper alignment and suspension function.

3. Limited Compatibility: The SuspensionMaxx SMX-153015 kit is designed specifically for the 1999-2007 Silverado/Sierra 1500 4x4. It may not be compatible with other models or years, so be sure to check the fitment before purchasing.

The SuspensionMaxx SMX-153015 1.5 Rear Block U-Bolt Kit offers several advantages, including improved ride quality, durability, easy installation, and affordability. However, there are also potential drawbacks, such as additional cost, the risk of over-tightening, and limited compatibility. Ultimately, the decision to purchase this kit depends on your specific needs, budget, and priorities. If you're looking for a cost-effective and reliable solution to address worn-out u-bolts in your 1999-2007 Silverado/Sierra 1500 4x4, the SMX-153015 kit is worth considering.

If you're confident in your DIY abilities and are looking to improve the durability and ride quality of your 1999-2007 Silverado/Sierra 1500 4x4's rear suspension system, the SuspensionMaxx SMX-153015 1.5 Rear Block U-Bolt Kit is an excellent option to consider. Make sure to follow the installation instructions carefully and double-check compatibility before purchasing.

Details:

Ideal for increasing ground clearance or fitting larger wheels and tires. Heavy-duty construction: CBC-machined from high-strength steel or aluminum for maximum durability. Suspensionmax heavy duty block and u-bolt rear leaf spring leveling kits are the perfect solution for lifting or of trucks Suva carrying loads including campers. Block and u-bolt kits can also be used to level vehicles that carry heavy loads.

Ideal for leveling or lifting vehicles, adding larger wheels and tires, hauling heavy loads. Fits 1999 -2006 Chevrolet/GMC Silverado/sierra 1500 4X4, as well 2007 classic model vehicles with 0.5625 inch diameter u-bolts. Made in America and covered under our structural lifetime warranty. Such loads can cause rear suspension to compress and sag-thereby reducing ride height .

Retains factory comfort and geometry: keeps driveling angles leaf spring function optimized for everyday driving or off-road action. Multiple height options: choose the perfect amount of lift to match your build and tire setup. Heavy duty rear block and u-bolt kit 1.5 inch for 1999 - 2007 classic Silverado/sierra 1500 4X4 6-bolt wheel with torsion bar front suspension 0.5625 inch diameter u-bolts. Position rear.

Suspensionmax provides all hardware needed and components are quickly installed using job specific tools. Suspensionmax provides application coverage for the most vehicles and largest number of height configuration options per vehicle. Suspensionmax heavy duty block and u-bolt kits are made with quality alloy metals for high strength long life-they wont crack or compress. Our block and u-bolt kits simply fit between rear leaf springs axle to compensate for suspension compression restore ride height .

Installation involves no major alterations to the vehicle and truck or SUV can easily be put back stock specifications. 100% American made and covered by the max structural lifetime warranty. Strong and durable-steel blocks, high strength u-bolts fasteners. Material steel.

Why truck owners trust suspensionmax rear lift blocks whether you're leveling your stance, prepping for big tires, or hauling more with stability, make sure raised the right way. When its time to raise the rear of your truck, you want a solution that's simple, strong, and built last. The suspensionmax SMX-153015 heavy duty block and u-bolt rear leaf spring leveling kit increases suspension height by 1.5 inches. Why truck owners trust suspensionmax rear lift blocks: ideal for leveling or towing loads: raise the rear to match a front lift compensate added weight.

Direct bolt-on install: installs easily between axle and leaf springs using existing hardware or included u-bolts. Require no extensive modifications to the vehicle-totally reversible.

specifications liftkitsparts:

• for models: 1500, 4x4, Silverado, Sierra
• for years: 1999–2007
• brand: Suspensionmaxx
• mpn: Smx-153015
• part type: Block Bolt
• included hardware: Mounting Hardware
• fitment type: Performance/custom
• lift height: 1.5 Rear
• country/region of manufacture: United States
• placement on vehicle: Rear
• performance part: Yes

general liftkitsparts:

• category: Auto Parts > Chassis, Suspension Brakes > Lift Kits

offer liftkitsparts:

• availability: in stock
• sold #: 18
• in stock #: 1
• price: $149.99
• item condition: New
• options: ship-to-home
• started: august 20, 2025

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seller liftkitsparts:

• # reviews: 2714
• city: cincinnati, ohio
• rating: 97.5%

returns liftkitsparts:

• policy: returns accepted
• paid by: seller
• time: 30 days

shipping liftkitsparts:

• service: ups ground, fedex priority overnight, fedex 2day
• carrier: ups, fedex
• type: fixed
• class: standard, one-day, expedited
• transit: 3-7 days