Differential Assembly for Isuzu Truck 4D31 4D34 with 18-Ton Load Capacity, Ductile Iron Housing, and Case-Hardened Gears

The Differential Assembly is a premium-quality, direct replacement drivetrain component designed for Isuzu medium-duty trucks equipped with 4D31 or 4D34 diesel engines and rated for 18 tons gross vehicle weight.

Function: Distributes engine torque between the left and right wheels while allowing them to rotate at different speeds during cornering. Ensures smooth turning, traction, and drivetrain durability for Isuzu 4D31/4D34 trucks.

• 18-Ton Load Capacity: Engineered for heavy-duty commercial use, withstands high torque and shock loads.
• Precision Gear Set: Hypoid ring and pinion, lapped for quiet operation and full tooth contact.
• Ductile Iron Housing: Superior strength and impact resistance compared to gray cast iron.
• Case-Hardened Gears: HRC 58-62 surface hardness for exceptional wear resistance.
• Pre-Assembled: Saves installation time; includes bearings and seals (no need to press).
• Direct Replacement: Matches OE mounting points and axle shaft splines.
• Restores Drivability: Eliminates noise, vibration, and poor traction.
• Cost-Effective: Affordable alternative to genuine Isuzu differentials.

This differential is designed for Isuzu trucks with 4D31/4D34 engines and 18-ton GVW rating.

Isuzu Truck Models (typical):

• ISUZU medium-duty trucks (model codes: NPR, NQR, FSR, FTR variants with 4D31/4D34)
• 4D31 engine: 3.6L inline 4 diesel
• 4D34 engine: 3.9L inline 4 turbo diesel

Installation steps (overview):

1. Remove the old differential from the axle housing.
2. Clean the housing and inspect axle tubes for damage.
3. Install new differential assembly with supplied bearings and seals.
4. Adjust side bearing preload using shims.
5. Set ring and pinion backlash to OE specification (typically 0.15-0.25 mm).
6. Verify tooth contact pattern using marking compound.
7. Reinstall axle shafts, fill with gear oil (GL-5, correct viscosity).
8. Road test and check for noise or leaks.

• Gear Metrology: Ring and pinion inspected for tooth profile, lead, and pitch error.
• Hardness Testing: Case depth and core hardness verified.
• Leak Test: Housing pressurized to check for porosity.
• Backlash & Preload Check: Sample assemblies tested for correct gear mesh.
• Magnetic Particle Inspection: Cracks in housing or gears detected.
• Visual Inspection: 100% checked for casting defects or machining errors.
• Packaged Safely: Coated with anti-rust oil, wrapped, boxed with foam supports.

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea