Allison S6610H

The Allison S6610H is a high-capacity, fully automatic transmission designed for heavy-duty tracked vehicles operating in the most demanding environments — including military combat systems, engineering equipment, and tactical support platforms. Built on Allison’s battle-proven “S” Series transmission architecture, the S6610H is engineered to provide exceptional torque capacity, smooth gear transitions, and precise electronic control for tracked vehicles requiring maximum driveline performance and mission reliability.

The “H” designation indicates a horizontal mounting orientation, ideal for compact engine bays and low-profile armored hull designs. Featuring six forward gears, one reverse, and a hydrodynamic torque converter with lock-up clutch, the S6610H enables vehicles to operate with both low-speed control and high-speed mobility, even in rugged, off-road conditions. This model is optimized for seamless integration with electronic vehicle management systems and offers advanced diagnostics for reduced maintenance and enhanced readiness in field operations.

Key Benefits of the S6610H Transmission

• High torque capacity for large tracked vehicles in extreme duty environments
• Horizontal design allows compact installation in low-clearance platforms
• Adaptive electronic controls enhance performance, reduce wear, and support diagnostics
• Ideal for modern military and engineering applications requiring superior drivetrain reliability
• Backed by Allison’s legacy of durable, mission-ready transmission systems

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Technical Specifications:

• Model: S6610H
• Series: Allison Specialty “S” Series
• Transmission Type: Fully automatic planetary transmission
• Mounting Orientation: Horizontal (low-profile, flat configuration)
• Number of Speeds: 6 forward, 1 reverse
• Torque Converter: Heavy-duty hydrodynamic torque converter with lock-up clutch
• Maximum Input Torque: Up to 2,250 lb-ft (3,051 Nm)
• Gross Vehicle Weight (GVW): 90,000–120,000+ lbs (40,800–54,400+ kg), depending on application
• Primary Applications:
  • Tracked armored combat vehicles
  • Combat recovery vehicles (CRVs)
  • Armored bridge-laying and engineering vehicles
  • Large tracked support systems in tactical and industrial operations
• Cooling Requirements: External oil-to-air or oil-to-water system mandatory
• Lubrication System: Full-pressure circulation with high-efficiency filtration
• Oil Specification: Allison TES-295 or TES-668 synthetic transmission fluid
• Electronic Control:
  • Integrated Allison Transmission Control Module (TCM)
  • Adaptive shift scheduling based on load and terrain
  • Built-in shift inhibition and drivetrain protection
• Diagnostics:
  • Compatible with Allison DOC® software
  • Supports onboard prognostics for fluid life, clutch health, and fault codes
• PTO Options: Optional, based on vehicle integration
• Dry Weight: Approx. 1,600–1,750 lbs (726–794 kg), depending on configuration
• Additional Features:
  • Horizontal layout reduces vertical space requirements in armored hulls
  • Engineered for ease of service and modular replacement
  • Optimized for continuous duty cycles under extreme thermal and terrain conditions
  • Proven track record in military and high-mobility tracked vehicle fleets