BDS 6-Inch Lift Kit | FOX 2.5 Performance Elite Coil-Overs | 5.5-Inch Rear Block + AAL | FOX 2.5 PE Piggyback Rear Shocks | Chevy Silverado / GMC Sierra 1500 4WD 2007–2013 | SKU: 176PES

Verified Fitment

Component Specifications

What Is and Is NOT Included

Critical Compatibility

Drivetrain and platform year confirmation are mandatory before ordering. The 2014 Silverado/Sierra 1500 is the K2 generation — a completely different platform. Do not order this kit for a K2-generation truck. Text (469) 407-7538 before ordering if you need help confirming your drivetrain or platform year.

GMT900 Silverado/Sierra 1500 6-Inch Kit Variant Reference

Text (469) 407-7538 to confirm shock tier and rear system preference before ordering.

Installation Notes

Skill Level: Advanced. A 6-inch coil-over lift with 5.5-inch rear axle block, Add-A-Leaf, and FOX 2.5 PE piggyback rear shocks on the GMT900 platform requires a qualified suspension shop. At 6 inches of lift, both front and rear disassembly are significant — this is not a bolt-on leveling kit. Do not attempt DIY installation.

Required Tools:

• Full hydraulic lift rated for truck weight
• Coil-over compression tool
• Torque wrench
• Full socket and wrench set

Alignment: Full front-end alignment is mandatory after installation. Do not operate the vehicle on public roads before alignment is completed.

Rear Axle Block and AAL Installation: 5.5-inch axle blocks must be installed per BDS specifications. The Add-A-Leaf supplements the factory rear spring pack to support the additional rear lift height — confirm leaf pack assembly sequence per BDS instructions. Confirm U-bolt torque specs and axle centering after installation. Improperly centered axle blocks cause driveline vibration and premature U-joint wear.

Reservoir and Piggyback Routing: Follow BDS and FOX installation instructions for both the front FOX 2.5 PE external reservoir and the rear FOX 2.5 PE piggyback reservoir placement. Avoid pinch points and heat sources on both ends. Incorrect routing causes premature shock failure.

Extended Brake Lines: Verify whether extended brake lines are required for your specific configuration at time of installation.

Torque Specs: Follow BDS-specified torque values included in the installation instructions. Do not substitute generic torque values on a lifted platform.

Tire Fitment: At 6 inches of lift on the GMT900 platform, typical fitment runs 35–37-inch tires depending on wheel offset and backspacing. Confirm maximum tire diameter and wheel specifications with your wheel and tire supplier before ordering.

The Obsidian Take

SKU 176PES is the premium-tier 6-inch block and AAL system for the 2007–2013 GMT900 Silverado or Sierra 1500 4WD owner who wants FOX 2.5 PE damping front and rear — external reservoir coil-overs up front and piggyback reservoir rear shocks in the back — with a 5.5-inch axle block and Add-A-Leaf at the rear.

The decision between 176PES and 176PSS is the shock tier only. Same platform, same 4WD requirement, same 5.5-inch block and AAL rear system — FOX 2.5 PE with external reservoir front and piggyback rear here versus FOX 2.0 Performance Series front and rear in 176PSS. FOX 2.5 PE delivers larger piston diameter, greater oil volume, and superior thermal management under sustained use. The piggyback rear shock in 176PES adds reservoir capacity at the rear axle — meaningful for trucks used off-road aggressively or towing at capacity where sustained damping consistency matters. If your GMT900 sees hard off-road use or regular towing loads, 176PES is the correct shock tier. If the FOX 2.0 Performance Series meets your use case, 176PSS delivers the same geometry at a lower price point.

The decision between 176PES and 177PES is the rear system. Both kits run FOX 2.5 PE throughout — the same coil-overs up front and the same piggyback rear shocks. The difference is the rear lift mechanism: 176PES uses a 5.5-inch axle block with Add-A-Leaf and 177PES uses 5.5-inch replacement leaf springs. Replacement leaf springs deliver a new spring rate, corrected geometry, and better articulation under towing and hauling loads. The block and AAL system raises the axle under the supplemented factory spring pack — a valid system, but one that does not replace the spring rate. For trucks used for regular towing or heavy hauling, 177PES is the stronger long-term rear solution. If the block and AAL rear meets your use case and the FOX 2.5 PE shock tier is the priority, 176PES delivers premium damping at the block rear price point.

This kit is for you if: You own a 2007–2013 Silverado or Sierra 1500 4WD, you want 6 inches of front lift with a 5.5-inch block and AAL rear system, and you want FOX 2.5 Performance Elite damping with piggyback reservoir rear shocks — the top shock tier available for this rear system configuration on the GMT900 platform.

This kit is not for you if: Your truck is 2WD — this kit does not apply. You want FOX 2.0 Performance Series — order SKU 176PSS. You want replacement leaf springs at the rear instead of a block and AAL — order SKU 177PES. You have a 2014 or newer Silverado/Sierra — different platform entirely, text OFAS for the correct K2 SKU. You have a 2006 or earlier or an HD model. Confirm your year and drivetrain before ordering — the kit is non-returnable once installed.

Common Questions

What is the difference between SKU 176PES and SKU 176PSS?
Both kits fit the 2007–2013 Silverado/Sierra 1500 4WD with a 5.5-inch block and AAL rear system at 6 inches of front lift. The only difference is the shock tier — 176PES uses FOX 2.5 Performance Elite with external reservoir coil-overs and piggyback rear shocks and 176PSS uses FOX 2.0 Performance Series front and rear. If you wheel hard, tow at capacity, or want the top damping tier, order 176PES. Text (469) 407-7538 to confirm which fits your use case.

What is the difference between SKU 176PES and SKU 177PES?
Both kits run FOX 2.5 PE throughout — same coil-overs, same piggyback rear shocks, same platform, same 4WD requirement. The difference is the rear lift mechanism — 176PES uses a 5.5-inch axle block with Add-A-Leaf and 177PES uses 5.5-inch replacement leaf springs. If you tow regularly or want a new spring rate at the rear, 177PES is the stronger long-term solution. Text (469) 407-7538 to confirm which rear system fits your use case.

What does the Add-A-Leaf do and why is it needed?
The Add-A-Leaf supplements the factory rear spring pack to support the additional rear lift height delivered by the 5.5-inch axle block. Without the AAL, the factory spring pack alone may not adequately support the lifted geometry under load. The AAL must be assembled in the correct sequence per BDS installation instructions — confirm with your installer before the job begins.

What does the FOX 2.5 PE piggyback rear shock add over a standard shock?
The piggyback reservoir adds external fluid volume at the rear axle — improving heat dissipation and damping consistency under sustained off-road or towing loads compared to a standard internal reservoir shock body. At 6 inches of lift on a GMT900 truck used hard, the piggyback rear is a meaningful upgrade over the standard FOX 2.0 rear shock in SKU 176PSS.

Does this fit my 2014 Silverado 1500?
No. The 2014 Silverado/Sierra 1500 is the K2 generation — a different platform entirely. Text (469) 407-7538 and we will identify the correct K2 SKU for your truck.

Does this kit include rear lift?
Yes. SKU 176PES includes 5.5-inch rear axle blocks, Add-A-Leaf, and FOX 2.5 PE piggyback rear shocks. This is a complete front-to-rear system.

What warranty covers this kit?
BDS suspension components are covered by the BDS No-Fine-Print Warranty. FOX 2.5 Performance Elite shocks carry a FOX 1-year limited warranty.

Manufacturer Data Disclaimer: Specifications sourced from BDS Suspension product documentation and authorized distributor data. Obsidian Forged Auto Supply is an authorized BDS Suspension dealer. Manufacturer specifications are subject to change without notice.

⚠️ California Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information visit P65Warnings.ca.gov.

⚠️ Non-Returnable Notice: Suspension components are non-returnable once installed. Confirm drivetrain, year, and platform before ordering. Text (469) 407-7538 with any fitment questions before your order is placed.