Genuine ZF Part 1250304384 | 5th Speed Gear (19 Teeth) for ZF Transmissions | Trusted ZF Parts Dealer

Genuine ZF Part 1250304384 | 5th Speed Gear (19 Teeth) for ZF Transmissions | Trusted ZF Parts Dealer

When a heavy-duty gearbox starts making a high-pitched whine in top gear, or if 5th gear begins to slip, the mechanical integrity of the gear teeth is usually the first place to look. The ZF 1250304384 5th Speed Gear is a precision-engineered component designed to handle the immense torque loads typical of ZF-equipped commercial vehicles.

As an experienced ZF parts dealer, we know that using “will-fit” aftermarket gears often leads to premature failure and increased noise. This genuine ZF part features 19 precisely cut teeth and a hardened surface treatment that ensures perfect mesh with the countershaft. Whether you are performing a routine overhaul or an emergency repair, sourcing from an authorized ZF parts supplier ensures that your transmission returns to factory-spec performance.

Technical Specification

• Brand: ZF Transmissions (Genuine OEM)

• Part Number: 1250304384

• Component: 5th Speed Gear

• Tooth Count: 19 Teeth

• Application: ZF Ecosplit / New Ecosplit series (Verify via gearbox Type Plate)

• Material: High-grade forged steel with specialized heat treatment.

• Weight: Standard OEM weight for high-speed rotational stability.

Simple Install Tip:

1. Check the Mating Gear: Never replace the 5th speed gear without inspecting the corresponding gear on the countershaft. If the countershaft gear shows “pitting” or uneven wear, it will quickly destroy your new gear.

2. Inspect Needle Bearings: The 5th gear rotates on a needle roller bearing. Always replace this bearing (and the inner race if applicable) when installing a new gear to prevent radial play and vibration.

3. End-Play Adjustment: After installing the gear train, verify the axial clearance (end-play) using a dial indicator. Incorrect shimming is the #1 cause of gear overheating and premature tooth wear.

4. Clean the Oil Galleries: Ensure that the oil spray nozzles or lubrication holes in the shaft are completely clear. A lack of lubrication at the 19-tooth interface will lead to instant galling under load.

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.