BDS 6-Inch Lift Kit | FOX 2.5 Performance Elite Coil-Overs | 5.5-Inch Rear Leaf Springs | FOX 2.5 PE Piggyback Rear Shocks | Chevy Silverado / GMC Sierra 1500 4WD 2007–2013 | SKU: 177PES

Verified Fitment

Component Specifications

What Is and Is NOT Included

Critical Compatibility

Drivetrain and platform year confirmation are mandatory before ordering. This kit is 4WD only. The 2014 Silverado/Sierra 1500 is a different platform entirely — do not order this kit for a K2-generation truck. Contact OFAS at (469) 407-7538 before ordering if you need help confirming your drivetrain or platform year.

GMT900 Silverado/Sierra 1500 6-Inch Kit Variant Reference

Contact OFAS at (469) 407-7538 to confirm which SKU is correct for your drivetrain, shock preference, and rear system before ordering.

Installation Notes

Skill Level: Advanced. A 6-inch coil-over lift with rear leaf spring replacement on the GMT900 platform requires a qualified suspension shop. At 6 inches of lift, this is a more involved job than a 4-inch system — both front and rear disassembly are significant. 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
• Leaf spring removal equipment per shop capability

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

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.

Break-In Period: Allow FOX 2.5 PE shocks front and rear and new leaf springs to complete the manufacturer-recommended break-in period before aggressive off-road use. New leaf springs require a seating period before reaching rated ride height.

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 177PES is the top-tier 6-inch system for the 2007–2013 GMT900 Silverado or Sierra 1500 4WD owner who wants the full FOX 2.5 PE treatment front to rear and a replacement leaf spring rear rather than a block and AAL setup. FOX 2.5 PE coil-overs with external reservoir up front, 5.5-inch replacement leaf springs, and FOX 2.5 PE piggyback rear shocks — this is the most capable configuration available for the GMT900 6-inch system on this platform.

The key decision point between 177PES and 176PES is the rear system. Both kits run FOX 2.5 PE. SKU 176PES uses a block and AAL rear — the axle is raised under the existing factory spring pack with an add-a-leaf to support the additional height. SKU 177PES replaces the entire rear spring assembly with 5.5-inch replacement leaf springs. Replacement leaf springs deliver a new spring rate engineered for the lifted geometry, improved articulation under towing and hauling loads, and a more consistent rear stance over time. A block and AAL system is a valid and cost-effective solution — but if you tow regularly, run this truck hard off-road, or want the most complete rear suspension upgrade at the 6-inch level, the replacement leaf springs in 177PES are the correct rear system.

The rear FOX 2.5 PE piggyback shock in 177PES adds reservoir capacity and thermal management at the rear axle — a meaningful upgrade over a standard shock at 6 inches of lift and aggressive use. Combined with the FOX 2.5 PE coil-overs up front, this kit delivers matched damping quality across the full suspension system.

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 full replacement leaf spring rear, and you want FOX 2.5 PE damping with piggyback reservoir rear shocks — the most capable 6-inch configuration available for this platform.

This kit is not for you if: You want a block and AAL rear instead of replacement leaf springs — order SKU 176PES for FOX 2.5 PE or SKU 176PSS for FOX 2.0. Your truck is 2WD — this kit does not apply. You have a 2014 or newer Silverado/Sierra — different platform entirely, contact 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 177PES and SKU 176PES?
Both kits fit the 2007–2013 Silverado/Sierra 1500 4WD and run FOX 2.5 Performance Elite at 6 inches of front lift on the GMT900 platform. The difference is the rear system — 177PES uses 5.5-inch replacement leaf springs with FOX 2.5 PE piggyback rear shocks and 176PES uses a block and AAL system. If you tow regularly, wheel hard, or want the most complete rear suspension upgrade at 6 inches, 177PES is the correct choice. Call (469) 407-7538 to confirm which rear system fits your use case.

What is the difference between SKU 177PES and SKU 176PSS?
Two variables: rear system and shock tier. SKU 176PSS uses a block and AAL rear with FOX 2.0 Performance Series shocks. SKU 177PES uses 5.5-inch replacement leaf springs, FOX 2.5 PE piggyback rear shocks, and FOX 2.5 PE coil-overs up front. These kits are not interchangeable on either variable. Call (469) 407-7538 to confirm which configuration fits your use case and budget.

Why choose replacement leaf springs over a block and AAL at 6 inches?
A replacement leaf spring changes the entire rear spring assembly — new spring rate, corrected geometry for the lifted height, and better articulation under towing and hauling loads. A block and AAL raises the axle under the existing factory spring pack and adds a leaf to manage the additional load. Both are valid systems. At 6 inches of lift with regular towing or aggressive off-road use, the replacement leaf spring delivers a more capable and consistent rear suspension long-term.

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

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

Does this kit include rear lift?
Yes. SKU 177PES includes 5.5-inch replacement rear leaf springs and FOX 2.5 PE piggyback rear shocks. This is a complete front-to-rear system.

What size tires fit at 6-inch 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.

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. Call (469) 407-7538 with any fitment questions before your order is placed.