Great quality product, fit and finish are top notch. Does as it was intended to.
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
If your vehicle has overload springs, call us for proper U-bolt sizing!
1999–2006 Chevy Silverado / GMC Sierra 1500 Rear Lift Blocks | 4", 6", 8"
The GMT800 Silverado and Sierra 1500 are one of the most popular platforms for a rear lift — whether you're leveling after a front lift kit, making room for bigger tires, or dialing in stance. The Apoc Industries Fabricated Steel Lift Blocks are built specifically for 1999–2006 fitment with a tapered design that corrects pinion angle at lift height and a 2.5" width that matches the factory leaf spring precisely.
Fits 1999–2006 Chevy Silverado 1500 and GMC Sierra 1500 (2WD and 4WD with rear leaf springs). Available in 4", 6", and 8" lift heights. Sold as a pair. Built in the USA.
Features
- Tapered Design: Built-in taper corrects pinion angle at lift height to reduce driveline vibration.
- Heavy-Duty Steel Construction: Fabricated from solid steel with precision machined mating surfaces for consistent load distribution.
- 2.5" Wide: Matches factory leaf spring width for a clean, centered fit.
- Multiple Center Pin Locations: Allows axle centering adjustment in the fender for proper alignment.
- True-to-Size Lift Heights: Listed height equals actual lift achieved.
- Satin Black Powder Coat: Durable corrosion-resistant finish.
- Bolt-On Install: No cutting, drilling, or welding required.
- USA-Made: Built by Apoc Industries.
What's Included
- 2x fabricated steel lift blocks (sold as a pair)
- Optional: U-bolts available at checkout
Installation
- Est. Install Time: 1–2 hours
- Tools Required: Torque wrench, breaker bar, basic hand tools
- Replace U-bolts when changing block height — never reuse compressed U-bolts
- Note: Not for use on vehicles with factory lift blocks already installed — verify block stack height before ordering
- Alignment recommended after installation
Fitment
- 1999–2006 Chevy Silverado 1500 (2WD and 4WD, all cabs and beds)
- 1999–2006 GMC Sierra 1500 (2WD and 4WD, all cabs and beds)
- Rear leaf spring suspension only
- Available lift heights: 4", 6", 8"
Complete Your Silverado / Sierra 1500 Build
- 1999–2006 Silverado / Sierra 1500 Ladder Traction Bars — control axle wrap at higher lift heights
- 2007–2018 Silverado / Sierra 1500 Lift Blocks — next generation version
- Apoc Build Blog — truck suspension install guides
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Sale price$ 259.09
Built Right. Backed. Right
Our crew’s on call Monday–Friday, 9–5 EST. Hit us up at 865-983-5004 — real support, done right.
First with Compound Tapers. Built to Stay Centered
Built Better, Not Cheaper. Period
Compound Taper Technology
Apoc Anti-Wrap Lift Blocks are the first ever with exclusive compound tapers. The top taper matches your factory OEM leaf spring angle for perfect seating, while the bottom taper maintains proper pinion angle at your chosen lift height.
The Problem with Standard Blocks
Most lift blocks only correct pinion angle and ignore the leaf spring angle. The taller the block, the further back they push your axle — throwing wheels off-center in the fenders and over-extending your driveshaft, which can damage your transfer case.
Benefits of Apoc Anti-Wrap Lift Blocks
Our heavier-duty steel construction with precision robotic welds delivers zero flex and maximum strength. The anti-wrap geometry keeps your axle centered, protects your drivetrain, and provides a stable ride — perfect for serious off-roaders, daily drivers, and tow vehicles.
FAQ'S
Lift Blocks
Here are some of the most common questions we receive about lift blocks, installation, and related components. Our goal is to help you make the best decision for your build with clear, practical information.
A: Yes. Apoc lift blocks are true to size—the height listed is the actual block height, providing that exact amount of rear lift when installed. For example, a 3" block adds 3" of lift over your current leaf spring height.
A: Apoc lift blocks are vehicle-specific and engineered to match your truck’s factory leaf spring setup. The alignment hole and center pin locations are precisely positioned to match OEM specs, ensuring a secure, direct fit with no modifications required.
The main U-bolts are required to secure the axle and block assembly to your leaf springs. You do not have to purchase them from us if your existing U-bolts are long enough. However, if you are changing the size of your lift block, you will need longer U-bolts. Simply measure the difference in height between your current block and the new block — your new U-bolts will need to be that much longer than your current ones.
Anti-wrap U-bolts are optional. They are designed to secure the wider footprint of the block more firmly to the leaf spring, helping to reduce axle wrap, spring twist, and wheel hop. The taller the block, the more beneficial anti-wrap U-bolts become. For block heights over 6 inches, we recommend also installing ladder bars for added stability and to prevent driveline issues.
A: Standard blocks provide basic lift, while anti-wrap blocks feature a wider footprint and additional bracing to reduce axle wrap and wheel hop—especially important for lifted trucks with big tires or high torque output.
A: No, stacking lift blocks is not recommended and can be dangerous. It compromises stability, increases the risk of axle shift, and can cause premature wear or failure of suspension components. Always use a single, properly sized Apoc lift block for safe, reliable performance.
100%
American-Made. No Compromises
Order With Confidence — But Verify Your U-Bolts
Most Apoc Industries vehicle-specific lift block kits already include U-bolts matched to your application. However, trucks with added leaf springs or overload packs are not accounted for in the standard kit. Please verify your current U-bolt lengths before installing — if anything doesn't match, our customer service team can get you the correct U-bolts and eliminate any issues before you're under the truck.
PRE-INSTALL CHECKLIST: CHOOSING THE RIGHT BLOCK HEIGHT
-
1Measure fender well gap — front and rear with the truck on level ground, measure the gap between the top of the tire and the fender well at the front axle and again at the rear axle.
-
2Calculate the difference more gap in front than rear (e.g. 2" more up front): you need to ADD that difference in the rear — select a block that matches the gap difference. More gap in rear than front (e.g. 2" more in back): you need a block SHORTER than your current one by that difference.
-
3Measure your current rear block height, Measure from the bottom of the existing block to the top where it contacts the leaf spring. Take the measurement at the center/middle of the block — not the front or rear edge. Some blocks are tapered, so the front edge may be shorter than the rear edge; the center gives you the true height.
-
4Calculate your target block height Current block height ± the fender gap difference = your target lift block height. Use this number to select your Size variant.
U-BOLT SELECTOR GUIDE
-
Identify your bend style — There are three bend types: Round bend (nuts sit on top of the leaf spring pack. Inside width typically matches the axle tube diameter.), Square bend (wraps over the top of the leaf spring pack; nuts tighten from below the axle. Inside width on square bends is typically matched to the leaf spring width, not the axle housing.), Semi-round bend (primarily used on Ford Super Duty applications)
-
Measure inside width — Measure the inside dimension between the two long legs of your current U-bolt (leg to leg, inside edge to inside edge). This must match your axle housing width.
-
Measure U-bolt length — Measure the total length of the long legs on your current U-bolts. When adding a taller block, you'll need longer U-bolts to maintain proper thread engagement through the axle plate and nuts.
-
Select your U-bolt option — Use your bend style, inside width, and leg length to select the correct U-bolt variant. If your current U-bolts are borderline on length after adding the new block height, size up.
Customer Reviews
Overall rating: 5.0 / 5 from 9 reviews.
The experience when ordering was a bit confusing at first, but while placing the order it gave the option of ordering all the hardware. Once the order was placed it was processed quickly and in less than a week my kit arrived. The parts are heavy duty and we'll made. A quality product well worth the money. Installation was easy. The center pins and holes lined up perfectly and the bolts were torqued and I was on the road in less than 2hours.
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Looks great and impressed on the design fit my pickup perfectly just difficult finding 16" u-bolts for the 8" rear blocks.
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Very nice quality
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Great quality. Great fit.
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Fit perfect
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Worked excellent
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
love the stuff I get here
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Ordered these so I could get rid of the basic cast iron ones that came with my procomp 6” lift and so I could remove the procomp add-a-leaf. The truck rode like a dump truck before. After installing these I also got rid of the annoying clunk in the rear caused by the pin size of the procomp blocks being too small and shifting on articulation. These are slightly taller than the standard blocks that come with most kits as they're an actual 6" and not 5 to level the truck. These fit perfectly, look fantastic and got the rear end riding and sounding perfect again. Truck stance is exactly where it should be. Thanks guys.
1999-2006 Chevrolet Silverado / GMC Sierra 1500 4, 6, 8 Inch Lift Blocks
Learn how to get the most out of your lift with expert install guides and tech tips from Apoc Industries.
Suspension Tech & Guides
Lift Blocks
Why Apoc’s New Compound Taper Anti-Wrap Lift Blocks Are a Game-Changer (Compared to Standard Blocks)
If you’re lifting your truck — whether for better stance, towing capability, off-roading, or just because it looks badass — the rear suspension is critical. Lift blocks are one of the most popu...