What This Air Spring Does
This is a drive axle air spring, not a trailer or steer position bag. It carries load on the rear suspension of PACCAR conventional tractors built with Air Leaf or Air Trac. The bellows rolls over a composite piston instead of folding on a convoluted bead, which is what makes it a reversible-sleeve design rather than a two or three convolution bag.
Dimensions on the aftermarket unit run roughly 18.0 inches extended and 7.5 inches collapsed, with a 9.0 inch top plate. Those three figures are what you check first against the old bag. If your extended height or plate diameter is different, you are looking at a different suspension family and this number will not be the one you want.
Failure is usually obvious. Sidewall cracks from ozone and road chemicals, chafe holes where the sleeve has been rubbing a frame rail or hose, or a bead that lets go at the piston after the bag has been run flat. Less obvious: a slow leak that only shows up overnight, leaving one corner down when the driver does a morning walkaround.
Why These Numbers Cross
W01-358-9069, 1R12-069, 9 10-14 P 312, 64274, AS-8312, S-13031, 57009069, AS-0077 and 1003589069C all describe the same physical bag. Air spring manufacturing is concentrated in a handful of bellows plants, and suspension builders, axle makers and distributors each apply their own catalog number to the same assembly. The bellows, piston, plate diameter and stud pattern do not change.
That means the number stamped or printed on your old bag depends on who supplied it originally, not on what the truck needs. A bag pulled from a truck that had suspension work done at a dealer may carry an entirely different number than the one that left the factory. All of them still land on the same replacement.
Cross-reference gets you to the right shelf. It does not confirm fitment. Verify by VIN, by the suspension model tag, or by measuring the old bag and matching the mounting hardware before you order. Two air springs with the same bellows can still differ in stud thread, air port position, or lower mount style.
Before You Order
Read the numbers off the old bag first. They are usually molded into the sleeve or printed on the piston, and they survive better than you would expect once you wire-brush the road film off. If nothing is legible, measure collapsed height with the truck dumped, extended height at ride, and top plate diameter.
Check the mounting while you are under there. Note the top stud arrangement, the air inlet location, and whether the lower mount is a stud, a bolt-through, or a bayonet on the piston. Also look at what killed the old bag. A chafe hole means something is rubbing, and a new bag installed against the same bracket or hose will fail the same way.
W01-358-9069 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to W01-358-9069. 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 |
|---|---|
| ContiTech | 9 10-14 P 312, 64274 |
| Goodyear | 1R12-069 |
| Hendrickson | S-13031 |
| Ridewell | 1003589069C |
| SAF-Holland | 57009069 |
| Triangle | AS-8312 |
| Watson & Chalin | AS-0077 |
Frequently asked questions
Is 1R12-069 the same air spring as W01-358-9069?
Yes, those numbers cross to the same reversible-sleeve drive axle air spring. One is the Firestone catalog number, the other the Goodyear number for the same bellows and piston assembly. Confirm by measuring your old bag and checking the mounting hardware before ordering.
How do I know if my truck has Air Leaf or Air Trac?
Look for a suspension identification tag on the frame rail or hanger bracket. If the tag is gone, your dealer can pull the suspension model from the VIN. This bag is specific to the PACCAR drive axle suspensions, so do not go by truck model alone.
Should I replace both drive axle air springs at once?
Generally yes. Bags on the same axle see the same age, heat cycles and road chemicals, so if one has failed the other is close behind. Replacing in pairs also keeps ride height even side to side, which matters for leveling valve behavior and tire wear.
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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Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.