Genuine ZF Synchronizer Ring 1238304420 – Premium ZF Transmission Parts for Smooth Shifting
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- In-stock availability for urgent repairs.
- Free technical guidance on installation and compatibility
- P/N:1238304420
Genuine ZF Synchronizer Ring 1238304420 – Premium ZF Transmission Parts for Smooth Shifting
Technical Specification
The ZF part 1238304420 is a vital Synchronizer Ring (also known as a Synchro Ring) engineered to match the speed of the gear and the shaft during shifting.
| Feature | Technical Data |
| Product Name | Synchronizer Ring / Synchro Ring |
| Part Number | 1238304420 / 1238.304.420 |
| Brand Compatibility | ZF (Genuine / OEM Replacement) |
| Material | High-Strength Friction Brass Alloy |
| Gearbox Models | ZF S5-42, S6-36, S6-80, S6-90 Series |
| Vehicle Application | Mercedes-Benz, MAN, IVECO, DAF, Renault |
| Outer Diameter | 110mm – 115mm |
| Weight | 0.28 kg |
Simple Install Tips
Proper installation is key to extending the life of your ZF transmission parts. Follow these expert steps:
Pre-Installation Soak: Before installing the ZF part 1238304420, soak the synchronizer ring in clean transmission oil (ZF-recommended oil) for at least 30 minutes. This prevents “dry friction” during the first gear change.
Inspect the Friction Surface: Check the internal taper of the ring for any imperfections. Ensure the mating gear cone is also smooth and free of scoring.
Check the “Gap” (Clearance): Use a feeler gauge to measure the clearance between the synchronizer ring and the gear. If the gap is below ZF service limits (usually < 0.8mm), the ring or gear must be replaced.
Clean the Hub: Ensure the ZF parts dealer provided the correct matching hub. Clean the teeth of the synchronizer hub (1238304520 or similar) to allow the ring to move freely without sticking.
Alignment: Align the notches on the ring with the synchronizer stones (dogs) in the hub assembly. Forcing it into the wrong position will damage the brass teeth immediately.
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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