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Genuine ZF 3rd Speed Gear (34 Teeth) for Ecosplit Transmissions – Part No. 1269304139
- 24/7 order processing with DHL/FedEx express options.
- In-stock availability for urgent repairs.
- Free technical guidance on installation and compatibility
- P/N:1269304139
Genuine ZF 3rd Speed Gear (34 Teeth) for Ecosplit Transmissions – Part No. 1269304139


Technical Specification
The ZF 3rd Speed Gear (Part No. 1269304139) is a precision-engineered component designed for high-torque heavy-duty transmissions. Featuring a 34-tooth configuration, this gear is critical for maintaining optimal power transmission ratios and seamless shifting in the ZF Ecosplit and Ecomid series. Manufactured from high-strength case-hardened steel, it is built to withstand extreme mechanical stress in commercial trucking and industrial applications.
| Attribute | Details |
| Brand | ZF (Zahnradfabrik Friedrichshafen) |
| Part Name | Gear 3rd Speed |
| Part Number (P/N) | 1269304139 / 1269 304 139 |
| Tooth Count | 34 Teeth |
| Compatibility | ZF Ecosplit (16S151, 16S181, 16S221, 16S251) |
| Material | High-Grade Case-Hardened Steel |
| Net Weight | 3.245 KG |
| Processing | Precision Forged & Heat Treated |
| Fitment Type | Direct OEM Replacement |
Simple Install Tips
To ensure the longevity of your ZF part 1269304139, follow these professional installation tips:
Synchronizer Inspection: Before fitting the new gear, always check the 3rd/4th gear synchronizer hub and sliding sleeve for wear.A worn synchronizer can cause the new gear to “jump” or grind.
Axial Play Check: Use a feeler gauge to verify the axial clearance after mounting the gear on the main shaft. Incorrect clearance is a leading cause of overheating and premature failure.
Lubrication: Pre-lubricate the gear teeth and internal needle bearings with genuine ZF-Ecofluid or recommended transmission oil to prevent dry-start friction.
Replace Seals: It is best practice to replace the transmission input/output seals and gaskets whenever the gearbox is opened to maintain a leak-free system.
Packaging & Shipping
By Express : Suitable for sample order or <50 KG Fast:3-10 days High shipping cost Door to door service
By Air : Suitable for >50 KG Fast: 3-7 days Lower than express cost Airport to airport service
By Sea: Suitable for >300 KG Lower cost port to port service


As a leading supplier and dealer of ZF parts, we provide genuine components to maintain the integrity and efficiency of your gearbox system. Trust in our expertise and quality assurance to keep your ZF gearbox running smoothly.
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