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High-Strength Alloy Steel Transmission Shaft with Precision Case-Hardening for ISUZU NKR 4JB1 - OEM Direct-Fit Replacement

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High-Strength Alloy Steel Transmission Shaft with Precision Case-Hardening for ISUZU NKR 4JB1 - OEM Direct-Fit Replacement

MOQ:	2 buah
harga:	negotiable
Kemasan Standar:	Paket Netral atau sebagai permintaan pelanggan
Periode pengiriman:	5-8 Hari Kerja
Metode Pembayaran:	T/T, Western Union
Kapasitas pasokan:	10.000 buah/bulan

Informasi detil

Deskripsi Produk

Informasi detil

Tempat asal

Nama merek

Sertifikasi

ISO/TS16949

Nomor model

ISUZU NKR 4JB1

Bahan:

20crmnti baja paduan

Kekerasan Permukaan:

HRC 58–62

Kekerasan Inti:

HRC 30–40

Tipe Splin:

24T atau 28T

Diameter Jurnal Bantalan:

Depan Ø 35mm, belakang Ø 30mm

Panjang Keseluruhan:

350–450mm

Toleransi Kelurusan:

≤ 0,05mm

Kapasitas torsi:

450 N·m terus menerus / puncak 650 N·m

Menyoroti:

ISUZU NKR 4JB1 transmission shaft

high-strength alloy steel driveshaft

OEM direct-fit ISUZU truck parts

Deskripsi Produk

Transmission Shaft 8-97368837-0 For ISUZU NKR 4JB1 — Main Shaft Assembly 8973688370

The Transmission Shaft (Main Shaft / Output Shaft) with OEM numbers 8-97368837-0 and 8973688370 is a verified direct-fit replacement for the ISUZU NKR series light-duty trucks equipped with the 4JB1 2.8L diesel engine and a manual transmission (commonly MSB-5S, MYY-5S, or MSG-5A). This shaft is a critical rotating component inside the gearbox, responsible for transmitting torque from the transmission to the driveshaft and ultimately to the wheels.

The main shaft carries the speed gears, synchronizer hubs, and bearings. It must withstand high torsional loads, bending stresses, and constant gear meshing forces. A worn, bent, or broken transmission shaft causes gear slippage, inability to engage gears, unusual grinding noises, vibration under load, and eventual transmission failure. This OE‑spec replacement shaft is manufactured from high‑strength alloy steel, heat‑treated to achieve the necessary hardness and toughness, and precision‑ground to exact factory tolerances, ensuring smooth power transfer and reliable gearbox operation.

Material & Heat Treatment Verification - Made of 20CrMnTi or equivalent alloy steel, carburized and quenched, surface hardness HRC 58–62, core hardness HRC 30–40 — verified by third‑party metallurgical report.
Dimensional Accuracy - Ground to ISO 7 tolerance class (or equivalent). Critical bearing seat concentricity within 0.02mm, spline profile go/no‑go gauge passed — CMM inspection available.
Load Capacity Tested - Rated torque capacity: 450 N·m (continuous) / 650 N·m (peak) — suitable for 4JB1 engine output (max torque ~230 N·m) with safety margin.
Proven Durability - Rated service life: 300,000 km under normal driving conditions — based on fleet tracking of 25+ ISUZU NKR trucks.
OEM Cross‑Reference Verified - Replaces ISUZU original part numbers: 8-97368837-0, 8973688370. Also known as 8-97368837-1 (supersession).

Part Number:	8-97368837-0 8973688370	Product Name:	Transmission Shaft
Car Model:	ISUZU NKR	Engine Model:	ISUZU 4JB1
Condition:	100% Brand New	Size:	Standard
Weight:	Standard	Origin:	China Mainland
Main Market:	Middle East, Asia, Africa, South America, North America & Europe	Package:	Neutral Packing Or Make It As Requested
Material:	High-strength aluminum alloy & precision bearings	Cooling Type:	Engine coolant circulation
Installation:	Direct OEM replacement	Quality Standard:	OEM equivalent / ISO quality control

Vehicle & Gearbox Compatibility

Compatible Vehicle Models

ISUZU NKR (all variants: NKR55, NKR57, NKR59, NKR69) with 4JB1 naturally aspirated or turbo diesel
Also fits some ISUZU NPR with 4JB1 (check gearbox model)
May fit ISUZU Faster / KB pickups with 4JB1 and same transmission

Compatible Transmissions (confirm with your vehicle)

MSB-5S (5‑speed, most common)
MYY-5S (5‑speed, heavy duty)
MSG-5A (5‑speed, later models)
Not compatible with 6‑speed or automatic transmissions

Features & Benefits

Feature	Benefit + Verification Signal
High‑strength alloy steel (20CrMnTi)	Withstands high torque — prevents twisting or breakage under heavy loads or sudden clutch engagement. Verified by tensile test (≥ 1000 MPa).
Precision case‑hardening (HRC 58‑62)	Wear‑resistant journal and spline surfaces — resists fretting and spline wear even after 300k km. Hardness profile verified by micro‑hardness tester.
Ground to tight tolerances (≤0.02mm concentricity)	Smooth bearing fit and low vibration — extends bearing and seal life. CMM inspection certificate available per batch.
Straightness ≤0.05mm	No gear whine or rumble — ensures even gear mesh contact. Straightness verified on precision centers with dial gauge.
Magnetic particle inspected	No hidden cracks — 100% of shafts MPI tested to ASTM E709. Cracks as small as 0.5mm detected and rejected.
OEM replacement fit	Direct bolt‑in — matches original spline count, length, and bearing seats. Verified against ISUZU factory drawings.
ISO 9001:2015 manufacturing facility	Consistent quality — each batch traceable with material and process certificates.

Quality Control & Verification

QC Item	Verification Method
Material composition	Spectrometer analysis per batch (C, Mn, Cr, Ti content)
Hardness (surface & core)	Rockwell hardness tester on sample from each heat treatment batch
Case depth	Micro‑hardness traverse from surface inward (0.8‑1.2mm required)
Dimensional inspection	CMM for length, diameter, concentricity; spline go/no‑go gauge
Straightness	Rotating on centers with dial indicator; maximum runout 0.05mm
Surface finish (Ra)	Profilometer on bearing journals — ≤0.4 µm Ra
Magnetic particle inspection	Wet fluorescent MPI on 100% of production (ASTM E709)
Torque to failure (destructive sample)	Occasional batch sample twisted in torsion tester to validate strength margin.

Installation & Maintenance Recommendations

⚠️ Important: Transmission shaft replacement requires complete disassembly of the gearbox. This is a specialized job for experienced transmission technicians.

Before installation:

Verify correct shaft: Count splines, measure length and bearing journal diameters on your old shaft before ordering.
Inspect mating gears and synchronizers: If the old shaft failed (e.g., broken spline, worn journal), also check the gears that run on that shaft for damage.
Replace all bearings and seals while the transmission is open — standard practice.
Prepare shims / adjusting washers if needed for bearing preload (varies by transmission).

Installation steps (high‑level, for professionals):

Remove transmission from vehicle.
Disassemble gearbox housing (reverse, intermediate, mainshaft).
Remove old main shaft with gears and synchronizers.
Press off old gears and bearings from the old shaft (if reusable).
Compare new shaft length, spline, and bearing positions.
Install gears, synchronizers, and new bearings onto new shaft (use press for bearings, avoid hammering).
Reassemble transmission with new gaskets and seals.
Adjust bearing preload using shims (refer to ISUZU workshop manual).
Refill with GL-4 80W‑90 gear oil (approx. 2.5‑3.0 L for NKR gearbox).
Road test: check for smooth shifting, no abnormal noise, and no oil leaks.

Troubleshooting after replacement:

Difficulty shifting gears: Incorrect shaft length or damaged synchronizers — recheck.
Vibration or whine: Shaft not straight or bearing preload incorrect — re‑inspect.
Leak at shaft seal: Seal damaged during installation or shaft surface scratched — replace seal.

Maintenance schedule:

Change gear oil every 50,000 km to keep shaft and gears lubricated.
If shaft is replaced, always replace transmission front and rear seals.

Packaging & Supply

Individual shaft wrapped in anti‑rust oil and VCI paper, placed in foam‑lined carton
Plastic caps on spline ends to prevent damage
Bulk wholesale: 10 shafts per master carton with dividers
Suitable for: ISUZU truck transmission rebuild shops, fleet maintenance workshops, gearbox parts distributors

Shipping dimensions: Approx. 50*15*10 cm, weight approx. 3–5 kg

Inquiry Call‑to‑Action

For Transmission Main Shaft 8-97368837-0 / 8973688370 for ISUZU NKR 4JB1:

✔️ Wholesale price for transmission rebuild shops and distributors
✔️ Single unit sample (verify fitment)
✔️ Bulk order discount & custom packaging
✔️ Material certificate & MPI test report

Please provide your quantity, destination port, and vehicle details (NKR model, year, transmission type/MSB-5S, and a photo of the old shaft if possible). We can confirm fitment before shipping.

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High-Strength Alloy Steel Transmission Shaft with Precision Case-Hardening for ISUZU NKR 4JB1 - OEM Direct-Fit Replacement

MOQ:	2 buah
harga:	negotiable
Kemasan Standar:	Paket Netral atau sebagai permintaan pelanggan
Periode pengiriman:	5-8 Hari Kerja
Metode Pembayaran:	T/T, Western Union
Kapasitas pasokan:	10.000 buah/bulan

Informasi detil

Deskripsi Produk

Informasi detil

Tempat asal

Cina

Nama merek

YIMI

Sertifikasi

ISO/TS16949

Nomor model

ISUZU NKR 4JB1

Bahan:

20crmnti baja paduan

Kekerasan Permukaan:

HRC 58–62

Kekerasan Inti:

HRC 30–40

Tipe Splin:

24T atau 28T

Diameter Jurnal Bantalan:

Depan Ø 35mm, belakang Ø 30mm

Panjang Keseluruhan:

350–450mm

Toleransi Kelurusan:

≤ 0,05mm

Kapasitas torsi:

450 N·m terus menerus / puncak 650 N·m

Kuantitas min Order:

2 buah

Harga:

negotiable

Kemasan rincian:

Paket Netral atau sebagai permintaan pelanggan

Waktu pengiriman:

5-8 Hari Kerja

Syarat-syarat pembayaran:

T/T, Western Union

Menyediakan kemampuan:

10.000 buah/bulan

Menyoroti

ISUZU NKR 4JB1 transmission shaft

high-strength alloy steel driveshaft

OEM direct-fit ISUZU truck parts

Deskripsi Produk

Transmission Shaft 8-97368837-0 For ISUZU NKR 4JB1 — Main Shaft Assembly 8973688370

Material & Heat Treatment Verification - Made of 20CrMnTi or equivalent alloy steel, carburized and quenched, surface hardness HRC 58–62, core hardness HRC 30–40 — verified by third‑party metallurgical report.
Dimensional Accuracy - Ground to ISO 7 tolerance class (or equivalent). Critical bearing seat concentricity within 0.02mm, spline profile go/no‑go gauge passed — CMM inspection available.
Load Capacity Tested - Rated torque capacity: 450 N·m (continuous) / 650 N·m (peak) — suitable for 4JB1 engine output (max torque ~230 N·m) with safety margin.
Proven Durability - Rated service life: 300,000 km under normal driving conditions — based on fleet tracking of 25+ ISUZU NKR trucks.
OEM Cross‑Reference Verified - Replaces ISUZU original part numbers: 8-97368837-0, 8973688370. Also known as 8-97368837-1 (supersession).

Part Number:	8-97368837-0 8973688370	Product Name:	Transmission Shaft
Car Model:	ISUZU NKR	Engine Model:	ISUZU 4JB1
Condition:	100% Brand New	Size:	Standard
Weight:	Standard	Origin:	China Mainland
Main Market:	Middle East, Asia, Africa, South America, North America & Europe	Package:	Neutral Packing Or Make It As Requested
Material:	High-strength aluminum alloy & precision bearings	Cooling Type:	Engine coolant circulation
Installation:	Direct OEM replacement	Quality Standard:	OEM equivalent / ISO quality control

Vehicle & Gearbox Compatibility

Compatible Vehicle Models

ISUZU NKR (all variants: NKR55, NKR57, NKR59, NKR69) with 4JB1 naturally aspirated or turbo diesel
Also fits some ISUZU NPR with 4JB1 (check gearbox model)
May fit ISUZU Faster / KB pickups with 4JB1 and same transmission

Compatible Transmissions (confirm with your vehicle)

MSB-5S (5‑speed, most common)
MYY-5S (5‑speed, heavy duty)
MSG-5A (5‑speed, later models)
Not compatible with 6‑speed or automatic transmissions

Features & Benefits

Feature	Benefit + Verification Signal
High‑strength alloy steel (20CrMnTi)	Withstands high torque — prevents twisting or breakage under heavy loads or sudden clutch engagement. Verified by tensile test (≥ 1000 MPa).
Precision case‑hardening (HRC 58‑62)	Wear‑resistant journal and spline surfaces — resists fretting and spline wear even after 300k km. Hardness profile verified by micro‑hardness tester.
Ground to tight tolerances (≤0.02mm concentricity)	Smooth bearing fit and low vibration — extends bearing and seal life. CMM inspection certificate available per batch.
Straightness ≤0.05mm	No gear whine or rumble — ensures even gear mesh contact. Straightness verified on precision centers with dial gauge.
Magnetic particle inspected	No hidden cracks — 100% of shafts MPI tested to ASTM E709. Cracks as small as 0.5mm detected and rejected.
OEM replacement fit	Direct bolt‑in — matches original spline count, length, and bearing seats. Verified against ISUZU factory drawings.
ISO 9001:2015 manufacturing facility	Consistent quality — each batch traceable with material and process certificates.

Quality Control & Verification

QC Item	Verification Method
Material composition	Spectrometer analysis per batch (C, Mn, Cr, Ti content)
Hardness (surface & core)	Rockwell hardness tester on sample from each heat treatment batch
Case depth	Micro‑hardness traverse from surface inward (0.8‑1.2mm required)
Dimensional inspection	CMM for length, diameter, concentricity; spline go/no‑go gauge
Straightness	Rotating on centers with dial indicator; maximum runout 0.05mm
Surface finish (Ra)	Profilometer on bearing journals — ≤0.4 µm Ra
Magnetic particle inspection	Wet fluorescent MPI on 100% of production (ASTM E709)
Torque to failure (destructive sample)	Occasional batch sample twisted in torsion tester to validate strength margin.

Installation & Maintenance Recommendations

⚠️ Important: Transmission shaft replacement requires complete disassembly of the gearbox. This is a specialized job for experienced transmission technicians.

Before installation:

Verify correct shaft: Count splines, measure length and bearing journal diameters on your old shaft before ordering.
Inspect mating gears and synchronizers: If the old shaft failed (e.g., broken spline, worn journal), also check the gears that run on that shaft for damage.
Replace all bearings and seals while the transmission is open — standard practice.
Prepare shims / adjusting washers if needed for bearing preload (varies by transmission).

Installation steps (high‑level, for professionals):

Remove transmission from vehicle.
Disassemble gearbox housing (reverse, intermediate, mainshaft).
Remove old main shaft with gears and synchronizers.
Press off old gears and bearings from the old shaft (if reusable).
Compare new shaft length, spline, and bearing positions.
Install gears, synchronizers, and new bearings onto new shaft (use press for bearings, avoid hammering).
Reassemble transmission with new gaskets and seals.
Adjust bearing preload using shims (refer to ISUZU workshop manual).
Refill with GL-4 80W‑90 gear oil (approx. 2.5‑3.0 L for NKR gearbox).
Road test: check for smooth shifting, no abnormal noise, and no oil leaks.

Troubleshooting after replacement:

Difficulty shifting gears: Incorrect shaft length or damaged synchronizers — recheck.
Vibration or whine: Shaft not straight or bearing preload incorrect — re‑inspect.
Leak at shaft seal: Seal damaged during installation or shaft surface scratched — replace seal.

Maintenance schedule:

Change gear oil every 50,000 km to keep shaft and gears lubricated.
If shaft is replaced, always replace transmission front and rear seals.

Packaging & Supply

Individual shaft wrapped in anti‑rust oil and VCI paper, placed in foam‑lined carton
Plastic caps on spline ends to prevent damage
Bulk wholesale: 10 shafts per master carton with dividers
Suitable for: ISUZU truck transmission rebuild shops, fleet maintenance workshops, gearbox parts distributors

Shipping dimensions: Approx. 50*15*10 cm, weight approx. 3–5 kg

Inquiry Call‑to‑Action

For Transmission Main Shaft 8-97368837-0 / 8973688370 for ISUZU NKR 4JB1:

✔️ Wholesale price for transmission rebuild shops and distributors
✔️ Single unit sample (verify fitment)
✔️ Bulk order discount & custom packaging
✔️ Material certificate & MPI test report

Please provide your quantity, destination port, and vehicle details (NKR model, year, transmission type/MSB-5S, and a photo of the old shaft if possible). We can confirm fitment before shipping.

Tag: