his ZF Transmission Synchronizer Ring (Part Number: 1297 333 137) is a direct replacement engineered to restore smooth shifting performance in ZF Ecosplit transmissions.

Unlike cheaper aftermarket alternatives that may crack under heat or lose friction coating prematurely, our synchronizer rings are manufactured to strict OEM tolerances. They are designed to handle the high torque output of Sinotruk engines, ensuring that gear changes remains crisp and noise-free, even under heavy loads.

Technical Specifications

Part Name: Synchronizer Ring / Blocking Ring
OEM Reference: 1297 333 137 (Also compatible with interchangeable ZF numbers)
Application Category: Sinotruk Spare Parts > Transmission System
Gearbox Compatibility: Fits ZF 16S Series (e.g., 16S151, 16S181, 16S221)
Material Construction: Forged Steel with Molybdenum coating for superior friction coefficient and heat resistance.
Surface Treatment: Shot-peened for increased fatigue strength.
Net Weight: 0.35 kg
Installation: Direct fit for the synchronization assembly (Check service manual for specific gear position).

FAQ Section :

Q: How do I know if this synchronizer ring fits my Sinotruk model?
- A: This part (1297 333 137) is standard for ZF 16S gearboxes used in most Sinotruk HOWO and A7 trucks. However, please send us your gearbox nameplate picture to confirm compatibility before ordering.
Q: Do you supply other Sinotruk spare parts for the transmission?
- A: Yes, we offer a full range of Sinotruk spare parts, including input shafts, bearings, and complete gearbox assemblies