Description
Automann AB1DK23P-9966 rolling lobe air spring for Reyco Granning 240AR drive-axle air-ride suspensions, used on Class A diesel-pusher motorhomes, commercial buses, and heavy on-highway trucks. Direct aftermarket replacement for Firestone W01-358-9966 (1T15M-7.5 bellows) and Reyco 20124-01 / -02 / -12. Plastic 1-bolt piston with internal jounce bumper, rated 7,500 lb at 100 PSI.
Signs You Need a New Air Spring
- Coach or chassis sitting lower than normal or uneven ride height
- Visible cracks, dry rot, or chafing on the rubber bellows
- Audible air leak at the bellows or top plate
- Excessive bounce or harsh ride under load
- Suspension dump / refill cycles run more frequently than normal
Specifications
| Manufacturer | Automann |
|---|---|
| Part Number | AB1DK23P-9966 |
| Part Type | Rolling Lobe Air Spring |
| Design Height | 11.00 in |
| Extended / Compressed Height | 22.10 in / 7.60 in |
| Maximum Diameter | 12.60 in |
| Top Plate | 9.00 in dia, 2 studs at 5.50 in C-to-C |
| Bottom Plate | 10.00 in dia, 1-bolt plastic |
| Internal Bumper | Yes |
| Load Rating @ 80 PSI | 5,900 lb |
| Load Rating @ 100 PSI | 7,500 lb |
| Firestone Bellows | 1T15M-7.5 |
Cross References
This part replaces or is equivalent to the following part numbers:
- Firestone: W01-358-9966, W01-755-9966, 9966
- Reyco Granning: 20124-01, 20124-01A, 20124-01K, 20124-02, 20124-12
- Spartan Chassis: 1919-DD4-001
- ContiTech: 64668
- World American: WA01-9966C
Applications
This rolling lobe air spring fits drive-axle air suspensions originally specified with any of the cross-referenced part numbers, including:
- Reyco Granning 240AR drive-axle air suspensions
- Spartan Mountain Master motorhome chassis
- Class A diesel-pusher motorhomes
- Commercial bus chassis
- Heavy-duty on-highway trucks specified with W01-358-9966
Note: May require a 1/2″ to 1/4″ NPT adapter depending on application. Verify air fitting size and mounting configuration before ordering to confirm fitment.
