Dana / Spicer DSP40-488

Dana / Spicer DSP40-488 Differential
DSP40488GTP

The Dana Spicer DSP40 is a robust, heavy-duty tandem-drive axle system engineered for Class 8 commercial vehicles. With a 40,000 lb gross axle weight rating (GAWR), it’s tailored for long-haul, regional haul, and vocational truck operations. Trusted by OEMs and fleets, the DSP40 combines rugged durability, high-efficiency gearing, and modular serviceability to deliver exceptional performance and uptime on demanding road conditions.

Key Features

• Heavy-duty capacity: Supports up to 40,000 lb GAWR, ideal for demanding applications such as long-haul tractors, dump trucks, and tankers.
• Hypoid gearing: Engineered with precision hypoid gears to maximize torque transmission while minimizing noise and friction.
• Modular design: Simplifies maintenance and repair with replaceable carriers, seals, bearings, and ring‑and‑pinion sets.
• Optional configurations: Available with inter-axle differential lock (power divider) or driver-controlled differential lock; supports wide range of gear ratios (approx. 2.47–6.14).
• Oil systems: Equipped with standard oil lubrication, with optional synthetic oil compatibility for extended drain intervals.

Technical Specifications

• GAWR: 40,000 lb (18,144 kg) per tandem axle
• Ring gear diameter: 15.40″ – 15.75″ hypoid gear set
• Spline count: 41‑spline carrier assemblies (e.g., DSP40342CF, DSP40355CF)
• Available gear ratios: Common ratios include 3.08, 3.36, 3.55, 3.73, 4.10, 4.56, etc.
• Differential types:
  • Standard open differential
  • Optional: Power Divider (inter‑axle lock) or Driver-Controlled Lock (DCDL)
• Carrier options: Steel or optional lightweight/severe-service housings; various input yokes (1710, 1760, SPL-type)