Peterbilt/Kenworth Air Spring Bag – Replaces W01-358-8864 / WA01-8864C
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 your truck’s suspension performance with the High Soar Air Spring Bag for Peterbilt & Kenworth, engineered as a heavy-duty replacement for selected OEM and aftermarket air ride systems. This suspension air spring is designed to replace popular reference numbers W01-358-8864 and WA01-8864C used on selected Peterbilt and Kenworth trucks.
Built from imported high-density rubber with multi-ply bellows and a reinforced piston, this air spring exceeds typical OEM requirements. The robust construction delivers greater durability, better load support and longer service life compared with many standard air suspension bags, helping your truck maintain the proper ride height and stability under load.
By effectively absorbing shocks and vibration, the High Soar air spring bag reduces harsh impacts transmitted to the frame and cab. This improves ride comfort, driver fatigue and braking stability, making it a smart choice when the original air bag is leaking, cracked or worn.
- Designed for Peterbilt & Kenworth trucks – fits suspensions using cross reference numbers W01-358-8864 and WA01-8864C (match to existing part number before purchase).
- Premium quality air ride – high-density rubber bellows and a strong piston/base design provide excellent load capacity and long service life.
- Safety & comfort – air spring bags help reduce physical collision impact on passengers, absorb vibration and support more controlled braking.
- Better driving experience – smoother ride, reduced bounce and more stable handling when loaded or empty.
- Easy installation – designed as a direct replacement when correctly matched by part number; no major modifications required in typical applications.
- Warranty-backed – includes a 1-year warranty and 100% quality assurance for added peace of mind.
Key air spring components:
- Piston – lower section of the air spring, made from aluminium, steel or composite plastic. Provides the lower mounting arrangement using threaded holes or studs.
- Girdle hoop (centre ring) – ring located between the convolutions of a convoluted-type air spring that helps maintain shape and stability.
- Bellows – the core of the air spring, consisting of multiple plies: an inner layer, two plies of cord-reinforced fabric and an outer protective layer for strength and flexibility.
- Bumper (bump stop) – solid moulded rubber fail-safe device used on many suspension applications to help protect the vehicle and suspension in the event of sudden air pressure loss.
Fitment reminder:
- This is not a universal air spring.
- Always confirm the part number on your original air bag or suspension specification before ordering.
- Only purchase if your existing air spring matches one of these numbers: W01-358-8864 or WA01-8864C.
- If you are unsure, consult your mechanic or parts manager to verify compatibility.
| Brand | High Soar |
|---|---|
| Part Type | Suspension Air Spring Bag / Air Ride |
| Vehicle Make | Peterbilt & Kenworth trucks (using listed cross reference numbers) |
| Cross Reference |
W01-358-8864 WA01-8864C Cross numbers are for reference only – verify details before purchase. |
| Application Position | Suspension air spring (air ride bag) |
| Material | High-density multi-ply rubber bellows with reinforced piston & |