Dana/Spicer DSP40-293

The Dana Spicer DSP40 series is a family of heavy-duty, tandem-drive axle differentials engineered for long-haul, regional haul, and vocational Class 8 truck applications. Designed to deliver exceptional reliability, fuel efficiency, and performance under demanding road conditions, the DSP40 series is part of Dana’s proven portfolio of drivetrain solutions and is widely trusted by OEMs and fleet operators across North America.

With a 40,000-lb gross axle weight rating (GAWR) and modular design architecture, the DSP40 series is optimized for ease of service, durability, and adaptability across various truck configurations. Its advanced gearing and differential designs provide smooth torque delivery, reduced noise and vibration, and enhanced efficiency at highway speeds.

Performance Features

• High-Efficiency Hypoid Gearing: Provides optimal torque delivery and reduced drivetrain drag, improving fuel economy in over-the-road applications.
• Durable Construction: Designed to withstand high torque loads from modern diesel engines and automated manual transmissions (AMTs).
• Optional DCDL: Improves traction in off-road or low-traction conditions by mechanically locking axle shafts together when needed.
• Precision Manufacturing: All gears and carriers are machined to tight tolerances for quiet operation and long service life.
• Modular Carrier Design: Allows for faster field service and easier overhauls, reducing downtime.

Service & Maintenance

• Oil Change Interval:
  • Conventional Oil: ~250,000 miles (with filtration and regular service checks)
  • Synthetic Oil: Up to 500,000 miles (under optimal conditions)
• Vent System: Integrated pressure-relief vent to maintain internal pressure and protect seals
• Replacement Parts Availability: Wide parts coverage including ring & pinion sets, yokes, seals, bearings, and complete carrier rebuild kits

Applications

The Dana DSP40 is engineered for use in:

• Long-haul highway tractors
• Regional delivery trucks
• Dump trucks and construction vehicles
• Tankers and bulk haulers
• Logging and off-highway vocational trucks

Its flexible configuration and wide range of gear ratios make it a preferred choice for fleets prioritizing durability, ease of maintenance, and fuel efficiency.

Technical Specifications:

• Model Series: Dana Spicer DSP40
• Axle Type: Tandem-drive axle
• GAWR (Gross Axle Weight Rating): 40,000 lbs (18,143 kg)
• Carrier Design: Forward-mounted carrier with hypoid gearing
• Axle Housing Options:
  • Standard (steel)
  • Severe-service
  • Lightweight (available for weight-sensitive applications)
• Available Ratios: 2.47 to 6.14 (commonly used: 3.08, 3.36, 3.55, 3.73, 4.10)
• Differential Type:
  • Standard open differential
  • Optional Power Divider (Inter-axle differential lock)
  • Optional Driver-Controlled Locking Differential (DCDL)
• Input Yoke Options: 1710, 1760, SPL250, SPL170, SPL140
• Lubrication: Standard oil-lubricated; synthetic oil recommended for extended service
• Mounting: 11-inch ring gear design with replaceable input seals and bearings

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800-621-3914

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