CST 10" STL Stage 3 Suspension System — 20+ Chevy / GMC HD 2500HD/3500HD 4WD
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at636-429-7020or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at636-429-7020and we’ll confirm current availability or estimated ship dates.
Description
Description
A true 10" of lift on a one-piece subframe — built for the diesel/Allison HD — for 2020–2025 Chevy Silverado / GMC Sierra 2500HD & 3500HD 4WD (Duramax/Allison). The flagship CST system: maximum height and clearance with extreme-duty steering and a CV front driveshaft.
What this stage includes
- One-piece welded subframe with laser-cut fabricated spindles
- CST boxed upper control arms
- One-piece differential-drop crossmember with sway-bar extensions
- Extended-length CST Extreme-Duty tie rods
- CV-style front driveshaft (diesel/Allison)
- Soft-ride rear leaf springs, 2" lift blocks, 1–2 torsion keys, and an HD rear U-bolt kit
- Plus CST PRO-Series 2.5 reservoir front and piggyback rear shocks, with compression adjusters
Why CST
- A true 10" of lift with no cutting or modifying the factory torsion X-member or UCA pocket
- One-piece subframe for maximum ground clearance and front-end protection
- Extreme-duty tie rods and a CV driveshaft built for the weight of the diesel/Allison
- Precision-fabricated in-house by CST in the USA
Good to know
- Built specifically for 2020+ Duramax diesel / Allison 4WD trucks
- Soft-ride rear leaf springs are not designed for towing — add air bags for load
- Clears 38" tires with no trimming, or 40s with minor trimming (20x9, 4.79" backspacing)
- Professional installation and alignment recommended
