7×43 Tooth Ratio Final Drive Gear Set ISO/TS16949 Certified Crown Wheel & Pinion with No Minimum Order Quantity for ISUZU NPR66 NKR57 4HF1
| Tooth Ratio: | 7×43 | Reduction Ratio: | 6.14:1 |
| Material: | Alloy Steel | Net Weight: | 10.7 Kg |
| Backlash: | 0.13-0.18 Mm | Position: | Rear Axle Differential |
| High Light: | 7×43 Tooth Ratio Final Drive Gear Set,ISO/TS16949 Certified Crown Wheel & Pinion,No Minimum Order Quantity Differential Gear Set |
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The Final Drive Gear Set (Crown Wheel & Pinion / Differential Gear Set) with OEM numbers 8-97035455-0 / 8970354550 is a verified direct-fit replacement for ISUZU NPR66, NKR57, and 100P trucks equipped with the 4HF1 diesel engine. As a core component of the rear axle differential, this matched crown wheel and pinion set reduces and redirects rotational power from the propeller shaft to the wheels, enabling vehicle drive and torque multiplication.
This gear set features a 7 × 43 tooth ratio (7-tooth pinion / 43-tooth crown wheel), delivering a total reduction ratio of approximately 6.14:1, suitable for older ISUZU NPR models (1992–1999). When gear teeth wear, pit, or fracture, it causes rear axle noise, weak drive, or vehicle immobility. Timely replacement restores proper differential operation.
| Part Number | 8-97035455-0 / 8970354550 | Product Name | Final Drive Gear Set (Crown Wheel & Pinion) |
|---|---|---|---|
| Car Model | NPR66 / NKR57 | Engine Model | 4HF1 |
| Condition | 100% Brand New | Size | Standard |
| Weight | Standard (approx. 10.7 kg) | Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe | Package | Neutral Packing or Made as Requested |
| Material | High-strength alloy steel & precision bearings | Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement | Quality Standard | OEM equivalent / ISO quality control |
| Brand | Model | Series | Engine | Note |
|---|---|---|---|---|
| ISUZU | NPR66 | ELF / N-Series | 4HF1 | Final drive gear set (crown wheel & pinion) |
| ISUZU | NKR57 | ELF / N-Series | 4HF1 | Final drive gear set (crown wheel & pinion) |
| ISUZU | NKR 2.75T | NKR Series | — | Final drive gear set (crown wheel & pinion) |
| ISUZU | 100P | N-Series | 4HF1 | Final drive gear set (crown wheel & pinion) |
| ISUZU | NPR old model (92–99) | NPR Series | 4HF1 | Final drive gear set (crown wheel & pinion) |
- Tooth Ratio Confirmation: This product is a 7 × 43 tooth ratio final drive gear set. ISUZU rear axles have multiple ratio configurations (e.g., 7×41, 7×39, 6×37). Confirm the original differential tooth ratio before ordering.
- Differential Assembly Number Confirmation: This gear set matches differential assembly number 8-97320103-0 / 8973201030. Verify the original differential assembly number before installation.
- Pre-Installation Verification: Please provide the VIN or original differential assembly number for precise fitment confirmation.
| Feature | Benefit & Verification Signal |
|---|---|
| 7×43 Precision Tooth Ratio | Tooth ratio precisely matches original differential specification, ensuring correct drive force and vehicle speed matching — verified against safrenos.com product specification (7×43). |
| Alloy Steel Construction | High-strength alloy steel material, heat-treated for withstanding high torque loads in the differential; wear-resistant and durable — per industry-standard differential gear material specifications. |
| Matched Crown Wheel & Pinion Set | Supplied as a complete matched set, ensuring tooth mesh accuracy and smooth transmission — per product type description (Final Drive Gear Set). |
| ISO/TS16949 QMS Certified | Manufacturer quality management system meets automotive industry standards — per ecer.com product certification information (IZUMI brand). |
| No Minimum Order Quantity | No MOQ requirement, supporting trial orders and urgent repair procurement — per ecer.com supplier policy. |
| 15-Day Fast Delivery | Delivery within 15 days, meeting urgent repair needs — per dutch.isuzu-truckspares.com shipping policy. |
| QC Item | Verification Method |
|---|---|
| Tooth Profile Accuracy Inspection | Gear measuring instrument — verifies tooth profile, pitch, and pressure angle meet OEM standards. |
| Tooth Surface Hardness Test | Hardness tester — verifies carburized and hardened tooth surface hardness meets wear-resistant design requirements. |
| Dimensional Accuracy Inspection | CMM coordinate measurement — ensures mounting dimensions and spline fit meet standards. |
| Matched Meshing Test | Meshing test — verifies crown wheel and pinion mesh clearance and contact pattern meet requirements. |
| Appearance & Packaging Inspection | 100% visual inspection — no cracks, burrs, or rust; packaging meets transport requirements. |
Certification: The manufacturer holds ISO/TS16949 automotive quality management system certification. Products undergo 100% testing before shipment.
Final drive gear set replacement involves rear axle differential disassembly and precision adjustment. Professional installation by a qualified technician using specialized tools is strongly recommended. Gear mesh clearance and contact pattern adjustment must be performed after installation. Improper installation will cause rapid gear wear or noise.
- Lift vehicle: Safely lift the vehicle, remove the propeller shaft and rear wheels.
- Remove differential: Remove the rear axle housing cover, extract the differential assembly.
- Remove old gears: Use specialized tools to remove the old crown wheel and pinion, then clean the differential housing.
- Install new pinion: Install the new pinion into the differential housing, adjust bearing preload and pinion depth.
- Install new crown wheel: Install the new crown wheel onto the differential case, tighten fixing bolts to specified torque.
- Adjust mesh: Use red lead paste to check the tooth contact pattern, adjust backlash to the specified range (reference: 0.13–0.18 mm).
- Reassemble differential: Reinstall the differential assembly, fill with the specified amount of differential oil.
- Road test: Perform a road test, check the rear axle for noise or leakage, and confirm proper drive.
- Every 20,000 km or 12 months: Check differential oil level and quality; replace if necessary.
- Every 50,000 km: Check the rear axle for abnormal noise and leakage signs.
- When rear axle noise, weak drive, or leakage is detected: Inspect gear wear promptly and replace the gear set if necessary.
ISUZU Final Drive Gear Set 8-97035455-0 / 8970354550 — 7×43 Crown Wheel & Pinion Set
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