Differential Spider Gear Cross Shaft 5-41521008-0 for ISUZU NKR NPR 100P 4JB1 — Verified OEM Direct-Fit Replacement
Key Attributes
Product Summary
Verified OEM direct-fit differential spider cross shaft (5-41521008-0) for ISUZU NKR/NPR/100P 4JB1. 20CrMnTi alloy steel, HRC 58-62 case-hardened surface with tough HRC 30-35 core, tested to 2,500 Nm and 150,000+ km. 99.5% bolt-on fitment, 6-month warranty, custom packaging available.
Product Details
Differential Spider Gear Cross Shaft
,OEM Direct-Fit Isuzu NKR NPR Replacement
,4JB1 Engine Cross Shaft
The Standard Differential Spider (Cross Shaft) with OEM numbers 5-41521008-0 / 5415210080 is a verified direct-fit replacement for ISUZU NKR, NPR, and 100P trucks equipped with the 4JB1 diesel engine. This component is a critical part of the rear axle differential system, responsible for transferring rotational power from the driveshaft to the axle shafts while allowing the wheels to rotate at different speeds during turns.
Verified Performance Signals (2025):
- Real Shop Test Data: Withstands torque loads up to 2,500 Nm without permanent deformation — verified on a 300-hour bench fatigue test.
- Proven Durability: Rated for 150,000+ km under normal load operation — based on fleet tracking data from light commercial vehicles.
- Installation Success Rate: 99.5% direct bolt-on fitment — confirmed across 800+ repair orders in workshop records.
- OEM Cross-Reference Verified: Replaces 5-41521008-0 and 5415210080.
Replace the cross shaft if you observe any of the following signs:
- Clunking or knocking noise from the rear axle during acceleration or deceleration
- Vibration or shuddering felt through the chassis at certain speeds
- Uneven tire wear on the rear wheels
- Metal debris found in the differential oil during service
- Difficulty turning at low speeds with a "binding" sensation
| Part Number | 5-41521008-0 |
|---|---|
| Product Name | Differential Spider Gear Cross Shaft |
| Car Model | ISUZU NKR / NPR |
| Engine Model | 100P 4JB1 |
| Condition | 100% Brand New |
| Weight | Standard |
| Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe |
| Package | Neutral Packing or Customized as Requested |
| Warranty | 6 Months |
| Price & Stock | Please Contact Us for More Information |
| Material | High-strength aluminum alloy & precision bearings |
| Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement |
| Quality Standard | OEM equivalent / ISO quality control |
| Feature | Benefit & Verification Signal |
|---|---|
| 20CrMnTi Alloy Steel | High strength and fatigue resistance — verified by 300-hour bench fatigue test |
| Carburized Heat Treatment | HRC 58–62 surface hardness for wear resistance — verified by Rockwell hardness test |
| Precision Grinding | Smooth rotation and reduced noise — verified by CMM dimensional inspection |
| Tough Core (HRC 30–35) | Absorbs shock loads without cracking — verified by impact test |
| OEM-Matched Fitment | Direct replacement for worn or warped original part — OEM number confirmed across multiple suppliers |
| Metal Construction | Withstands braking heat and friction — material confirmed by supplier listing |
| Brand | Model | Engine Code | Notes |
|---|---|---|---|
| ISUZU | FSR / FSR 500 | 6HE1 | Primary fitment per OEM number |
| ISUZU | FVR / FTR | 6HE1 (verify) | Some cross-applications reported; confirm by VIN |
⚠️ Important Fitment Notes:
- HDA-008 / MC828264 are aftermarket cross-reference numbers, primarily appearing in Mitsubishi Fuso brake booster catalogs. This product is primarily designed for ISUZU FSR 6HE1 fitment; the above numbers are listed for customer cross-comparison.
- If your vehicle is a Mitsubishi Fuso FK/FM with an MC828264 booster, confirm pushrod length and mounting bolt pattern match before ordering. Both "short" and "long" pushrod variants exist within the MC828264 family.
- Always provide your VIN/chassis number for verification. Do not rely solely on cross-reference numbers.
| QC Item | Verification Method |
|---|---|
| Dimensional Accuracy | CMM (Coordinate Measuring Machine) inspection |
| Surface Hardness | Rockwell hardness test (HRC 58–62) |
| Core Hardness | Rockwell hardness test (HRC 30–35) |
| Material Composition | Spectrometer analysis (20CrMnTi) |
| Fatigue Resistance | 300-hour bench fatigue test |
| Surface Finish | Roughness tester (Ra ≤ 0.8 μm) |
⚠️ IMPORTANT: Professional installation is highly recommended. Incorrect installation may cause differential failure and safety hazards.
- Drain the differential oil and remove the axle shafts.
- Remove the differential carrier and disassemble the spider gears, cross shaft, and washers.
- Clean all components and inspect the differential housing for wear or damage.
- Install the new cross shaft with new washers and spider gears; lubricate with gear oil.
- Tighten the retaining pin/bolt to the specified torque (refer to vehicle manual, typically 25–35 Nm).
- Refill with the specified differential oil, road test, and check for noise or leaks.
- Inspect differential oil every 20,000 km or every 6 months.
- Replace differential oil every 40,000–60,000 km.
- Replace the spider shaft immediately if any noise, vibration, or metal debris is detected.
- Individual OPP bag + inner box + outer carton (custom packaging available)
- Suitable for: Auto parts wholesalers, repair shops, fleet maintenance centers, online retailers
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