Description
The Monroe 65408 is a Gas-Magnum 65 monotube, nitrogen-charged rear shock absorber for Class 6-8 Freightliner trucks running airliner rolling-lobe air suspension. The 1-3/4″ bore and extended hydraulic lockout deliver consistent damping under high-mileage severe-service loads while preventing air-bag over-extension. Replaces Freightliner 1613947000, Gabriel 85319 / 89428, and Meritor M85319 / M89428.
Signs You Need a New Shock Absorber
- Excessive bouncing or swaying of the rear axle
- Poor handling and reduced steering response
- Uneven or cupped tire wear patterns
- Visible oil leaking from the shock body
- Harsh ride quality or bottoming out over bumps
- Air bag over-extension or damage
Specifications
| Manufacturer | Monroe |
|---|---|
| Part Number | 65408 |
| Product Line | Gas-Magnum 65 |
| Part Type | Shock Absorber |
| Position | Rear |
| Gas Charge | Nitrogen |
| Internal Design | Monotube |
| Bore Size | 1-3/4″ (44.5 mm) |
| Reserve Tube | 2-3/8″ |
| Extended Length | 21.75″ (552 mm) |
| Compressed Length | 14.125″ (359 mm) |
| Travel | 7.625″ |
| Upper Mount | Stem |
| Lower Mount | Loop Bushing — 3/4″ Sleeve ID x 2-3/4″ OAL |
| Hydraulic Lockout | Yes (Extended) |
| Dust Shield | Yes (Metal) |
| Parts Pack | P01482 (included) |
| Finish | Black Painted |
Cross References
This shock replaces or is equivalent to the following part numbers:
- Freightliner: 1613947000, 6813260400
- Gabriel: 85319, 89428
- Meritor: M85319, M89428
- Sachs: 316306
- Neway: 57365408
- Volvo / GM: 3919953
- Navistar / International: AMS650408
- Mack: 650408
- Paccar Parts: 680473
- Haldex: SA65408
- Automann: A85319
- KYB: 345617
- NAPA: 65408
- FCS: F343375, F346601, F347274
- Bulldog HD: HD12150064
- Alliance: ABPN32G900073, ABPN32O900073, ABPN32G900016, ABPN32O900016
- Dayton Parts: 44185319
- Power10 Parts: SSA-85319
- Euclid: M89428
Applications
This rear shock fits Freightliner Class 6-8 trucks with airliner rolling-lobe air suspension:
- Freightliner FLB (1994–1999, 2002)
- Freightliner FLC112 (1985–2001)
- Freightliner FLC120 (1981–1988, 1991)
- Freightliner FLD112 (1991–2007)
- Freightliner FLD120 (1988–2011)
- Freightliner M2 112 (2003–2010)
Gas-Magnum 65 Features
- Nitrogen Gas Charge: Reduces aeration and foaming for consistent damping control.
- 10-Stage Valving: Vehicle-specific tuning across the travel range.
- Large 1-3/4″ Bore: Built for high-mileage severe service.
- Extended Hydraulic Lockout: Prevents over-extension of air bags and seal damage.
- Heavy-Duty Nitrocarburized Rod: 15,000 lb tensile strength.
- PTFE-Coated Rod Bearing: Reduces rod-to-guide friction.
- 360° Arc Welds and Shouldered/Bonded Bushings: Built for structural integrity and bushing retention.
Sold individually — replace shocks in pairs for balanced handling. The 65408 fits airliner rolling-lobe spring air suspensions; for convoluted spring air suspension use Monroe 65407 instead. Verify your rear suspension type and mounting configuration before ordering.
