Allison S6610M

The Allison S6610M is a heavy-duty, fully automatic transmission designed for the most demanding tracked military and industrial vehicles requiring extreme durability, high torque capacity, and advanced electronic shift control. As a member of Allison’s proven “S” Series, the S6610M is engineered for high-mass tracked platforms such as combat recovery vehicles, bridge layers, engineering support vehicles, and other military-grade tactical systems.

The “M” designation refers to its military-optimized configuration, offering battlefield-grade performance in extreme conditions including mud, sand, steep gradients, and heavy payloads. With six forward speeds, one reverse, and a lock-up torque converter, the S6610M delivers superior power transfer, fuel efficiency, and terrain-adaptive control. Its horizontal mounting orientation makes it ideal for integration in low-clearance armored hulls, while the integrated electronic control module allows for intelligent, protective shifting and real-time diagnostics.

This transmission is purpose-built for scenarios that demand long-duration torque delivery, rugged shock resistance, and modular serviceability — key advantages for military fleets operating in combat zones or remote environments.

Key Benefits of the S6610M Transmission

• High torque capacity for extreme-duty tracked platforms
• Proven reliability in military combat and support vehicle fleets
• Low-profile horizontal design simplifies installation in armored chassis
• Electronic control system improves fuel efficiency and driveline safety
• Built for sustained power delivery and reduced wear under heavy loads

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Technical Specifications:

• Model: S6610M
• Series: Allison Specialty “S” Series
• Transmission Type: Fully automatic planetary transmission
• Mounting Orientation: Horizontal (compact, low-profile layout)
• Number of Speeds: 6 forward, 1 reverse
• Torque Converter: Heavy-duty hydrodynamic unit with lock-up clutch
• Maximum Input Torque: Up to 2,250 lb-ft (3,051 Nm)
• Gross Vehicle Weight Rating (GVWR): 90,000–120,000+ lbs (40,800–54,400+ kg), depending on application
• Primary Applications:
  • Armored tracked military vehicles
  • Combat engineer and mine-clearance vehicles
  • Armored bridge layers
  • Heavy tracked logistics and support vehicles
• Retarder: Not included (available in “HR” variant)
• Cooling System: Requires external oil-to-air or oil-to-water cooling system
• Lubrication: Internal pressure-lubricated system with high-efficiency filtration
• Oil Specification: Allison-approved TES-295 or TES-668 synthetic ATF
• Electronic Controls:
  • Integrated Allison TCM (Transmission Control Module)
  • Shift inhibition and protective shift scheduling
  • Load- and terrain-adaptive control logic
• Diagnostics & Monitoring:
  • Compatible with Allison DOC® diagnostic software
  • Monitors fluid life, clutch wear, and fault codes in real time
• PTO Capability: Optional, depending on vehicle integration
• Dry Weight: Approx. 1,600–1,700 lbs (726–771 kg), depending on specific configuration
• Construction Features:
  • Military-grade materials for durability and thermal resistance
  • Modular, serviceable architecture for faster field maintenance
  • Sealed electronics for harsh environment protection
  • Horizontal layout optimized for armored vehicle hull integration