Industry-Verified Manufacturing Data (2026)

Rear Differential

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Rear Differential used in the Motor Vehicle Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Rear Differential is characterized by the integration of Differential Case and Ring Gear. In industrial production environments, manufacturers listed on CNFX commonly emphasize Cast Iron construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A mechanical device in the drivetrain that splits torque between the rear wheels while allowing them to rotate at different speeds.

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Product Specifications

Technical details and manufacturing context for Rear Differential

Definition
The rear differential is a critical component of an All-wheel Drive System, located at the rear axle. It receives rotational power from the transmission via the driveshaft and distributes it to the rear wheels. Its primary function is to allow the two rear wheels to rotate at different speeds, which is essential when turning, as the outer wheel travels a longer path than the inner wheel. This prevents tire scrubbing, reduces wear, and improves vehicle handling and stability.
Working Principle
The differential uses a set of gears (typically a ring gear, pinion gear, and spider/side gears) housed within a differential case. Input torque from the driveshaft rotates the ring gear, which turns the differential case. Inside, the spider gears (or planetary gears) are mounted on a carrier attached to the case. These spider gears mesh with two side gears, each connected to an axle shaft leading to a wheel. When driving straight, the case, spider gears, and side gears rotate as a single unit, delivering equal torque to both wheels. During a turn, the spider gears rotate on their own axes, allowing the side gears (and thus the wheels) to rotate at different speeds while still transmitting torque.
Common Materials
Cast Iron, Alloy Steel
Technical Parameters
  • Ring gear diameter, a key dimension affecting torque capacity and gear ratio. (mm) Per Request
Components / BOM
  • Differential Case
    The main housing that contains the differential gears and rotates with the ring gear to transmit power.
    Material: Cast Iron or Aluminum Alloy
  • Ring Gear
    A large gear bolted to the differential case; driven by the pinion gear from the driveshaft to provide input rotation.
    Material: Hardened Alloy Steel
  • Pinion Gear
    A small gear meshed with the ring gear; connected to the driveshaft to transfer power into the differential.
    Material: Hardened Alloy Steel
  • Spider Gears (Planetary Gears)
    Set of small gears mounted on a carrier inside the case; they rotate to allow the side gears (and wheels) to turn at different speeds.
    Material: Hardened Alloy Steel
  • Side Gears (Sun Gears)
    Two gears meshed with the spider gears; each is splined to an axle shaft to drive a rear wheel.
    Material: Hardened Alloy Steel
Engineering Reasoning
0-150°C operating temperature, 0-300 N·m torque input, 0-5000 rpm input speed
Gear tooth surface temperature exceeding 250°C causes loss of surface hardness (HRC < 45), bearing cage deformation at 180°C, lubricant viscosity breakdown at 150°C
Design Rationale: Thermal fatigue from cyclic Hertzian contact stresses exceeding 1.2 GPa at gear mesh interfaces, combined with lubricant film thickness reduction below 0.1 μm at boundary lubrication conditions
Risk Mitigation (FMEA)
Trigger Insufficient lubricant film thickness (λ < 1.0) at gear tooth interface
Mode: Micropitting and spalling on hypoid gear teeth surfaces
Strategy: Implement forced lubrication system with 0.15 MPa minimum pressure and ISO VG 75-90 synthetic gear oil with EP additives
Trigger Axial preload loss in tapered roller bearings exceeding 0.05 mm clearance
Mode: Bearing skidding and cage fracture during torque reversal events
Strategy: Design with interference fit bearing seats (H7/s6 tolerance) and Belleville washer preload system maintaining 200-400 N axial force

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Rear Differential.

Rear Diff heavy duty rear differential for trucks performance rear differential upgrade rear differential replacement cost alloy steel differential gears cast iron differential housing

Applied To / Applications

This component is essential for the following industrial systems and equipment:

All-wheel Drive System
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0-5 bar (internal lubrication pressure)
other spec: Maximum torque capacity: 500-5000 Nm (model dependent), Maximum input speed: 6000 RPM
temperature: -40°C to 120°C
Media Compatibility
✓ Automotive gear oil (SAE 75W-90) ✓ Synthetic differential fluid ✓ Heavy-duty hypoid gear lubricant
Unsuitable: High-particulate slurry environments (e.g., mining mud, abrasive industrial slurries)
Sizing Data Required
  • Vehicle weight and axle load rating
  • Engine torque output and gear ratio
  • Intended application (road, off-road, racing, towing)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Gear tooth pitting and spalling
Cause: Inadequate lubrication leading to metal-to-metal contact, contamination from wear particles, or excessive loading beyond design limits causing surface fatigue
Bearing failure
Cause: Lubrication breakdown (thermal degradation or moisture contamination), improper preload adjustment, or seal failure allowing contamination ingress
Maintenance Indicators
  • Whining or howling noise during acceleration/deceleration indicating gear wear or improper backlash
  • Fluid leaks around differential housing or axle seals, often accompanied by burnt oil smell
Engineering Tips
  • Implement strict lubrication management: Use manufacturer-specified gear oil with proper viscosity and additive packages, maintain correct fluid levels, and perform oil analysis at regular intervals to monitor wear metals and contamination
  • Establish vibration monitoring program: Install accelerometers on differential housing to detect early bearing defects and gear mesh issues through frequency analysis, enabling predictive maintenance before catastrophic failure

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 Quality Management Systems ISO 16281:2008 Calculation of Load Capacity of Spur and Helical Gears DIN 3962 Tolerances for Cylindrical Gear Teeth
Manufacturing Precision
  • Bore Diameter: +/-0.025mm
  • Gear Backlash: 0.10-0.15mm
Quality Inspection
  • Magnetic Particle Inspection for Cracks
  • Gear Mesh Pattern Analysis

Factories Producing Rear Differential

Verified manufacturers with capability to produce this product in China

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✓ 96% Supplier Capability Match Found

S Sourcing Manager from Australia Jan 16, 2026
★★★★★
"Found 24+ suppliers for Rear Differential on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
P Procurement Specialist from Singapore Jan 13, 2026
★★★★☆
"The technical documentation for this Rear Differential is very thorough, especially regarding technical reliability. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Germany Jan 10, 2026
★★★★★
"Reliable performance in harsh Motor Vehicle Manufacturing environments. No issues with the Rear Differential so far."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

7 sourcing managers are analyzing this specification now. Last inquiry for Rear Differential from India (33m ago).

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Frequently Asked Questions

What is the purpose of a rear differential in a vehicle?

The rear differential splits engine torque between the rear wheels while allowing them to rotate at different speeds, which is essential for smooth turning and traction on varied surfaces.

What materials are used in manufacturing this rear differential?

This rear differential is constructed from high-strength cast iron for the housing and alloy steel for the gears, ensuring durability, heat resistance, and long-term performance under stress.

How often should a rear differential be serviced or replaced?

Service intervals vary by vehicle use, but generally, differential fluid should be changed every 30,000 to 60,000 miles. Replacement may be needed if there's noise, vibration, or damage to components like gears or the case.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Motor Vehicle Manufacturing sector.

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