What This Air Spring Does
This is a rolling-lobe, reversible-sleeve air spring for the drive axle on Peterbilt tractors with the Low Air Leaf rear suspension. The bellows rolls over a composite plastic piston instead of folding like a convoluted bag. That design gives a longer stroke and a softer ride at highway load, which is why the Low Air Leaf uses it rather than a two- or three-ply convoluted spring.
Key dimensions on the PartStop unit: 23.5 in extended height, 6.7 in compressed, 10.25 in maximum diameter, and a 9.00 in top plate. The top is a stud-style bead plate. Those numbers matter more than the label on the old bag — if the extended height or plate diameter is different, you are looking at a different spring family.
Construction is multi-ply natural rubber bellows with a composite piston. This is a premium quality aftermarket part sold under the PartStop brand and carries a 6+ month warranty. It is not sold as, or affiliated with, any original equipment manufacturer.
Why These Numbers Cross
Air springs get catalogued by physical envelope and mounting hardware, not by truck model. W01-358-8852, Goodyear 1R12-568, ContiTech 64339 and 9 10-19 P 472, Meritor FS8852, Automann 1DK23L-8852, Triangle 8472, and Navistar FLTA1R12568 all describe the same reversible-sleeve assembly: same bellows diameter, same stroke range, same stud bead plate, same piston mount.
Peterbilt 03-07887 is the truck-builder number for that same assembly as it was released on the Low Air Leaf suspension. That is the number you will most often find on a Peterbilt parts screen or a service record, while the bellows itself will usually carry the supplier number moulded or stamped into the bead plate.
All numbers above are listed for identification only. They belong to their respective manufacturers, and PartStop is not authorised or endorsed by any of them. Use the list to confirm you are shopping the right air spring family, then verify against the part in your hand.
Check Before You Order
Pull the old spring and read the bead plate. Measure the top plate diameter and the stud pattern, then measure ride height at the axle with the suspension aired up. A Peterbilt built as a 379, 378, 385, 367, 389, 567 or 579 can leave the plant with more than one rear suspension, so the model badge alone does not settle it.
Cross-reference is a starting point, not a fitment promise. Confirm by VIN through a dealer parts system or by the number stamped on the spring you removed. If the old bag is shredded and unreadable, measure the mounting bracket spacing and the collapsed height before you commit.
W01-358-8852 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to W01-358-8852. 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 | 1DK23L-8852 |
| ContiTech | 64339, 9 10-19 P 472 |
| Goodyear | 1R12-568 |
| Meritor | FS8852 |
| Navistar | FLTA1R12568 |
| Peterbilt | 03-07887 |
| Triangle | 8472 |
Frequently asked questions
Is Peterbilt 03-07887 the same air spring as W01-358-8852?
They describe the same reversible-sleeve drive-axle air spring for the Low Air Leaf suspension. 03-07887 is the truck-builder number; W01-358-8852 is the supplier number for the same assembly. Confirm by VIN or by the number on the spring you removed before ordering.
How do I know the air bag is leaking and not a fitting or valve?
Air the system up, shut it down, and spray the bellows, the bead plate seam, and the piston base with soapy water. A bag leak usually shows at a crease or where the sleeve rolls on the piston. If bubbles only show at the port or the leveling valve line, replace the fitting first.
Should I replace both drive-axle air springs at the same time?
Standard shop practice is to replace in pairs on the same axle. Springs age together, and a new bag paired with a worn one can leave the truck sitting unevenly and load the leveling valve. Check the ride height at both sides after the swap and adjust the valve linkage if needed.
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
Need the part, not just the reading?
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.