Allison S8610MR

The Allison S8610MR is a high-capacity, fully automatic transmission engineered for severe-duty military tracked vehicles that demand superior torque management, durability, and braking performance. As part of the Specialty “S” Series, the S8610MR combines the military-optimized design of the “M” variant with the integrated hydraulic retarder of the “R” series, making it exceptionally well-suited for heavy tactical vehicles operating in harsh, hilly, or high-load environments.

This 6-speed horizontal-mount transmission is built to handle extremely high input torque while delivering smooth, electronically controlled gear shifts and enhanced braking through its internal retarder. The torque converter with lock-up clutch maximizes fuel efficiency and minimizes drivetrain wear during high-speed operation. Engineered for modularity, thermal resilience, and battlefield serviceability, the S8610MR offers the reliability, diagnostics, and braking control necessary for today’s advanced combat recovery, bridging, and engineering systems.

Key Benefits of the S8610MR Transmission

• Combines high torque capacity with integrated retarder braking for steep or high-load terrain
• Horizontal mounting fits modern low-profile armored hulls
• Modular military design supports fast service and replacement in the field
• Retarder reduces wear on service brakes, improving vehicle safety and longevity
• Adaptive electronic control ensures performance under variable combat or engineering conditions
• Built to endure long-duration missions in extreme environmental and operational stress

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Technical Specifications:

• Model: S8610MR
• Series: Allison Specialty “S” Series
• Transmission Type: Fully automatic planetary transmission with integrated hydraulic retarder
• Mounting Orientation: Horizontal (ideal for compact hulls in tracked vehicles)
• Number of Speeds: 6 forward, 1 reverse
• Torque Converter: Heavy-duty hydrodynamic unit with lock-up clutch
• Integrated Retarder: Yes – hydraulic, for auxiliary braking and downhill control
• Maximum Input Torque: Up to 2,500 lb-ft (3,390 Nm)
• Gross Vehicle Weight Rating (GVWR): 120,000–150,000+ lbs (54,400–68,000+ kg), based on application
• Primary Applications:
  • Combat engineering and recovery vehicles
  • Self-propelled artillery and bridging systems
  • Armored tracked logistics and tactical support vehicles
  • Heavy tracked systems requiring controlled descent braking
• Cooling Requirements:
  • Dual-path cooling for transmission and retarder
  • External oil-to-air or oil-to-water heat exchangers required
• Lubrication System: Internal pressurized system with high-efficiency filters
• Oil Specification: Allison TES-295 or TES-668 synthetic ATF
• Electronic Controls:
  • Integrated Allison Transmission Control Module (TCM)
  • Load- and terrain-adaptive shift logic
  • Integrated retarder control with engine braking coordination
• Diagnostics & Monitoring:
  • Compatible with Allison DOC® diagnostic tools
  • Live monitoring of clutch wear, fluid health, temperature, and system faults
• PTO Capability: Optional depending on configuration
• Dry Weight: Approx. 1,900–2,100 lbs (861–953 kg), based on variant
• Construction Features:
  • Reinforced military-spec housing and internal gearing
  • Retarder-equipped output section for braking efficiency
  • Modular service design for field maintenance and part replacement
  • Electronics protected for harsh environments (sealed connectors, EMI resistance)