BDS 4-Inch Lift Kit | FOX 2.0 Performance Series Coil-Overs | Rear Leaf Springs | Chevy Silverado / GMC Sierra 1500 4WD 2007–2013 | SKU: 185PSS

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 4-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 4-inch coil-over lift with rear leaf spring replacement on the GMT900 platform requires a qualified suspension shop. Leaf spring replacement is a more involved rear suspension job than an axle block installation — plan accordingly. 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.

Break-In Period: Allow FOX 2.0 Performance Series shocks 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 4 inches of lift on the GMT900 platform, typical fitment runs 33–35-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 185PSS is the standard-tier leaf spring rear system for the 2007–2013 GMT900 Silverado or Sierra 1500 4WD owner who wants 4 inches of front lift with a replacement rear spring assembly at the FOX 2.0 Performance Series price point. This is not a spacer lift and not a block rear — the replacement leaf springs change the entire rear spring assembly with a new spring rate and improved articulation compared to a block-lifted factory pack.

The decision between 185PSS and 186PES is the shock tier only. Same 4WD platform, same replacement leaf spring rear — FOX 2.0 Performance Series here versus FOX 2.5 PE with external reservoir in 186PES. FOX 2.0 Performance Series is a legitimate damping upgrade over factory shocks and handles daily driving, mild off-road, and light towing competently. If you run this truck hard off-road, tow at or near capacity regularly, or want external reservoir thermal management, step up to SKU 186PES. If the FOX 2.0 Performance Series meets your use case, 185PSS delivers the same 4-inch lift geometry and replacement leaf spring rear at a lower price point.

The decision between 185PSS and 184PSS is the rear system. Both are 4WD-specific and both run FOX 2.0. SKU 184PSS uses a 5-inch axle block and 185PSS uses replacement leaf springs. A block rear raises the axle under the existing factory spring pack without changing the spring rate. A replacement leaf spring delivers a new spring rate, corrected geometry, and better articulation under towing and hauling loads. For trucks used for towing or heavy hauling, 185PSS is the stronger long-term rear solution. If a block rear fits your use case and budget, 184PSS is the alternative.

This kit is for you if: You own a 2007–2013 Silverado or Sierra 1500 4WD, you want 4 inches of front lift with a replacement leaf spring rear, and FOX 2.0 Performance Series is the correct shock tier for your budget and use case.

This kit is not for you if: Your truck is 2WD — order SKU 187PSS. You want FOX 2.5 PE damping — order SKU 186PES. You want a 5-inch axle block rear instead of leaf springs — order SKU 184PSS. 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 185PSS and SKU 186PES?
Both kits fit the 2007–2013 Silverado/Sierra 1500 4WD with a replacement leaf spring rear on the GMT900 platform. The only difference is the shock tier — 185PSS uses FOX 2.0 Performance Series and 186PES uses FOX 2.5 Performance Elite with external reservoir. If you wheel hard or tow at capacity regularly, order 186PES. Call (469) 407-7538 to confirm which fits your use case.

What is the difference between SKU 185PSS and SKU 184PSS?
Both kits fit the 2007–2013 Silverado/Sierra 1500 4WD and run FOX 2.0 Performance Series on the GMT900 platform. The difference is the rear system — 185PSS uses replacement leaf springs and 184PSS uses a 5-inch axle block. If you tow regularly or want a new spring rate at the rear, 185PSS is the stronger long-term solution. Call (469) 407-7538 to confirm which rear system fits your use case.

What is the difference between SKU 185PSS and SKU 187PSS?
Drivetrain only. Both kits run FOX 2.0 Performance Series with replacement leaf springs on the GMT900 platform. SKU 185PSS is for 4WD and SKU 187PSS is for 2WD. Confirm your drivetrain before ordering — this is a non-returnable error.

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 185PSS includes replacement rear leaf springs and FOX 2.0 Performance Series rear shocks. This is a complete front-to-rear system.

What size tires fit at 4-inch lift on the GMT900 platform?
Typical fitment runs 33–35-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 2.0 Performance Series 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.