What This Air Spring Does
This is a cab/sleeper air spring, not a chassis or drive axle bag. It sits between the cab mount bracket and the frame and carries only the weight of the cab or bunk. Its job is ride isolation for the driver compartment, keeping road input and driveline vibration out of the seat, the floor and the sleeper.
The design is a reversible sleeve: a rubber bellows rolls over a piston rather than folding like a convoluted bag. That gives a soft, progressive rate over short travel. Published dimensions are 6.25 in. diameter, 2.4 in. compressed height and 7.56 in. extended height. Check your old bag against those numbers before you order.
Position matters when you order. A truck can run cab bags and sleeper bags of different heights on the same chassis. Pull the number off the crimped plate or the sleeve of the unit you are replacing and match it, rather than assuming both corners take the same part.
Why These Numbers Cross
W02-358-7007 is the Firestone catalog number for this style. Mack listed the same physical bag under 227QS34 and later 25166846 for its cab and sleeper suspension. Goodyear built the equivalent under 1S6-067, with 1S4-067 showing up in the same interchange family. Same envelope, same mounting hardware pattern, same working height range.
The aftermarket numbers follow the same logic. Torque TR7007, Meritor FS7007, Automann ABSZ70-7007 and Airstar 103.01.7007 all carry the 7007 or 067 suffix that traces back to the original style designation. Suppliers keep that suffix precisely so a parts counter can walk from one brand to another without a dimensional catalog.
These numbers are listed for identification only. PartStop is an independent aftermarket supplier and is not affiliated with, endorsed by, or authorized by Firestone, Mack, Goodyear, Meritor, Automann, Torque or Airstar. A cross-reference is a starting point. Confirm fit by VIN or by the number stamped on the bag you are pulling off.
Failure Signs And Install Checks
Cab bags usually die from age and ozone cracking at the sleeve fold, not from overload. Look for a cab that settles overnight, a bunk that leans to one side, or a rattle over expansion joints that was not there last year. Soap the air fitting and the crimp ring with the engine running to find slow leaks.
Before you swap, inspect the piston and the top plate for corrosion and check the cab leveling valve and its linkage. A worn valve or a bent arm will kill a new bag's ride quality and can cause a repeat sag that gets blamed on the air spring. Replace any hardened or cracked air line while the area is open.
W02-358-7007 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to W02-358-7007. 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 |
|---|---|
| Airstar | 103.01.7007 |
| Automann | ABSZ70-7007 |
| Goodyear | 1S6-067, 1S4-067 |
| Mack | 227QS34, 25166846 |
| Meritor | FS7007 |
| Torque | TR7007 |
Frequently asked questions
Is 227QS34 the same bag as 25166846?
Both Mack numbers appear in the same interchange group for this cab air spring, with 25166846 being the later listing. They share the 6.25 in. reversible-sleeve envelope. Verify by comparing the compressed and extended heights and the mount hardware on the unit you removed before ordering.
Do I have to replace cab air springs in pairs?
You do not have to, but it is common shop practice. If one bag has cracked from age, the other side is the same age and usually not far behind. Replacing both keeps the cab sitting level and saves a second teardown later.
How do I confirm this fits my Mack before ordering?
We cannot promise fitment from a model name alone. Read the number off the old air spring, or verify the application by VIN with your dealer or parts source. If the old bag is unreadable, measure diameter, compressed height and extended height and compare to the 6.25 in., 2.4 in. and 7.56 in. figures listed for this part.
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.