Trunnion 338‑1845 – 4" Shaft × 4" Spring – Fits Mack Rear Heavy‑Duty Suspension

The Mack Rear Trunnion Assembly (4″ diameter) is a heavy-duty suspension component designed to support the rear spring beam and manage articulation in tandem axle configurations. This complete assembly is engineered to OEM standards for strength, durability, and longevity in severe-duty vocational and fleet applications.

OEM Cross References:
3381845, 131604L, M1117, 39QK325, 39QK325M, R303645

Key Features:
• Application: Mack tandem axle rear suspension systems
• Supports rear spring beam and allows proper articulation
• Heavy-duty construction for extreme load environments
• Precision-engineered to OEM specifications
• Direct replacement for multiple Mack part numbers