Kenworth Air Spring Bag – Heavy-Duty Suspension (C81-1005/C81-1004) – Replaces W01-358-9541/9547
Warranty Information
ROADWEST stands behind the parts we sell. Unless otherwise stated on the product page, your purchase is covered by a 1-Year Limited Warranty against manufacturing defects under normal use.
What’s covered
- Defects in materials or workmanship
- Premature failure caused by factory-related issues
What’s not covered
- Normal wear and tear, cosmetic aging, corrosion from environment/road salt
- Damage from improper installation, incorrect wiring, modifications, misuse, or accidents
- Labor costs (installation/removal), downtime, towing, or other indirect costs
How to file a claim
Contact us with:
- Order number
- Product name / SKU
- Clear photos or a short video showing the issue
If approved, ROADWEST will provide an appropriate resolution (replacement parts, replacement unit, or refund/credit).
Please do not send items back without return authorization.
For more details, see our Shipping Policy, Easy Return & Refund Policy, and Warranty pages.
Shipping & Returns
Most ROADWEST orders ship from our U.S. warehouses within 1–2 business days. Standard ground delivery in the contiguous United States is typically 1–3 business days, with freight service used for oversized or extra-heavy parts.
- Shipping area: United States only (no PO Boxes or international addresses).
- Processing time: In-stock items usually ship within 1–2 business days, Mon–Fri.
- Delivery: Standard ground or LTL freight depending on size and weight.
- Returns: Most unused items may be returned within 30 days of delivery, subject to inspection and our return guidelines.
- Costs: Original and return shipping are generally the customer’s responsibility, unless the issue is caused by ROADWEST (wrong item, damaged on arrival, etc.).
For full details, please review our Shipping Policy and Easy Return & Refund Policy before placing your order.
Upgrade or restore your Kenworth suspension with the High Soar Air Spring Bag, engineered as a heavy-duty replacement for popular Kenworth air ride applications. This suspension air bag is designed to replace W01-358-9541, W01-358-9547, C811005, C811004 and cross to Contitech 9 9-10 P 861, delivering reliable load support and a smoother ride for long-haul and vocational trucks.
Built from high-density imported rubber, this air spring is made to exceed typical OEM standards. The reinforced construction offers excellent load capacity, better resistance to cracking and fatigue, and longer service life compared to many standard aftermarket bags. Whether you are running line haul, regional routes or heavy-duty work, this air spring helps keep your suspension performing at its best.
By effectively absorbing road shocks and vibration, the High Soar air spring improves driver comfort and helps protect cab components, cargo and chassis from harsh impact. It also contributes to more stable braking and handling, giving you a safer and more controlled driving experience, especially under load.
Installation is straightforward when the correct cross reference is matched. This air bag is intended as a direct replacement for suspension systems that originally used W01-358-9541 / W01-358-9547 / C811005 / C811004. Simply remove the worn or leaking original bag, install the new air spring in its place, and check for proper ride height and air-tight connections.
- Perfect fit for Kenworth air suspension – designed to replace Kenworth C811005 / C811004 and equivalent assemblies.
- OE cross references – compatible with W01-358-9541, W01-358-9547, Contitech 9 9-10 P 861 and related numbers (verify all part numbers before ordering).
- High-density rubber construction – exceeds typical OEM durability, providing enhanced load-bearing performance and long service life.
- Improved safety & comfort – absorbs vibration and impact, helping reduce driver fatigue and improving braking stability.
- Easy installation – direct replacement design for compatible Kenworth suspensions; no major modifications required.
- Warranty support – backed by a 1-year warranty and dedicated customer service.
Fitment Reminder: This is not a universal air bag. Always confirm the part number on your original air spring or suspension documentation. Only purchase if your truck currently uses one of the following numbers: W01-358-9541, W01-358-9547, C811005, C811004, Contitech 9 9-10 P 861. If you are unsure, consult your mechanic or parts manager before ordering.
| Brand | High Soar |
|---|---|
| Part Type | Suspension Air Spring Bag / Air Ride |
| Vehicle Make | Kenworth – selected models using listed OE air bags |
| Typical Application | Rear suspension / axle air spring on Kenworth trucks with C811005 / C811004 assemblies |
| Cross Reference |
Firestone / Aftermarket: W01-358-9541, W01-358-9547 Kenworth: C811005, C811004 (also written C81-1005 / C81-1004) Contitech: 9 9-10 P 861 Cross numbers are for reference only; verify all specs before purchase. |
| Material | High-density rubber air bladder with reinforced construction |
| Fit Type | Vehicle Specific Fit – match by OE / cross reference number |
| Function | Supports vehicle load, absorbs road shock and vibration, improves ride comfort & stability |
| Color / Finish | Black air spring |
| Included Components | 1 × Air Spring Bag (replacement for listed cross references) |
| Warranty | 1 Year Limited Warranty against manufacturing defects |