What This Air Spring Is
This is a reversible-sleeve air spring with a composite piston, built for the drive-axle position on the Kenworth Airglide 200 rear suspension. Extended height is 11.0 inches, compressed height is 3.9 inches. The top plate measures 9.0 inches and mounts with studs. The bellows callout on the Firestone side of the family is 1T15LA-1.
Reversible-sleeve springs work differently from convoluted bags. The rubber sleeve rolls down over the piston as the axle travels up, so the spring rate stays flat through most of the stroke. That is what keeps ride height steady under a swinging load. It also means the piston diameter and top plate pattern have to match, not just the overall height.
PartStop lists this as an aftermarket direct replacement. It is not an OEM part and we are not affiliated with, endorsed by, or authorised by Kenworth, Firestone, Goodyear, ContiTech, or any other manufacturer. Their numbers appear here so you can identify the part you already have.
Why These Numbers Cross
Air spring numbering is fragmented because the same physical assembly gets sold by the bag maker, the suspension maker, the truck OEM, and the aftermarket house. W01-358-9622 is the Firestone Airide catalogue number. Goodyear lists the same envelope as 1R11-221. ContiTech carries 65367 and 68359, with 9 9-9 P 537 showing up as an alternate ContiTech callout on the same family.
Kenworth sells it under K303-22 because the Airglide 200 was their suspension and they stocked the service part under a truck-side number. Automann 1DK20G and Torque TR9622 are aftermarket equivalents. Torque's number is a straight tail-end match to the Firestone digits, which is a common convention and a useful clue when you are sorting a mixed shelf.
What makes them cross is geometry, not branding: same bellows profile, same 11.0 inch extended and 3.9 inch compressed height, same 9.0 inch stud-mount top plate, same piston. If a number you have in hand matches on those four points, you are almost certainly looking at the same spring. Confirm against the number stamped or moulded on the old bag.
Checks Before You Order
Pull the old spring and read it. The label on a reversible-sleeve bag sits on the top plate or on the sleeve near the girdle hoop, and it is usually legible even when the rubber is shot. That number beats any catalogue lookup. If the label is gone, measure extended height, compressed height, top plate diameter, and count and locate the studs and the air port.
Also confirm you actually have Airglide 200 and not a different Kenworth rear suspension, and check ride height at the axle before you condemn the bag. A spring that will not hold height can be a leaking bellows, a cracked piston, a stuck height control valve, or a broken linkage. Cross-reference is a starting point only — verify fitment by VIN or by the number on the part you removed.
W01-358-9622 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to W01-358-9622. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Automann | 1DK20G |
| ContiTech | 65367, 68359, 9 9-9 P 537 |
| Firestone | 1T15LA-1 |
| Goodyear | 1R11-221 |
| Kenworth | K303-22 |
| Torque | TR9622 |
Frequently asked questions
Is K303-22 the same air spring as W01-358-9622?
They are listed as equivalents for the Kenworth Airglide 200 drive-axle position. K303-22 is the truck-side service number and W01-358-9622 is the Firestone Airide number for the same reversible-sleeve assembly. Confirm the number on your old bag or check by VIN before ordering, since suspension configurations changed across builds.
How do I know if my air bag is bad or if it's the height control valve?
Air the system up and spray soapy water around the bellows, the girdle hoop, and the air port. Steady bubbles mean the bag is leaking. If the bag holds but the truck still sits low or high on one side, look at the height control valve and its linkage arm — a bent or disconnected arm will keep the valve from calling for air.
What measurements should I take off the old spring?
Extended height, compressed height, top plate diameter, stud pattern, and air port location. This spring is 11.0 inches extended, 3.9 inches compressed, with a 9.0 inch stud-mount top plate. If your old unit does not match those numbers, you have a different spring and the cross-reference does not apply.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
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