Basic Info

• OE Part No.: 1358 302 203

• Cross Reference OE: MAN 81323020241, DAF 2134088, Iveco 42578961

• Product Type: Mainshaft Constant Mesh Gear / K2 Gear

• Brand: ZF OEM Matching Replacement Spare Parts

• Compatible Gearbox: ZF 12TRAXON 12TX2420 / 12TX2620 / 12TX2820 AMT 12-speed transmission

• Applicable Vehicles: Sinotruk Sitrak, FAW J7, MAN TGX, DAF XF, Iveco Stralis heavy haul tractors

• Material: 20CrMnTi alloy steel, integral forging, carburized quenching + precision tooth grinding

• Net Weight: approx 2.77kg

• Tooth Count: 40 teeth

• Internal Structure: Inner involute splines for mainshaft fitting

• Max Matching Input Torque: 2800 N·m

• Function: Constant mesh power transmission for intermediate & high gears, stable torque delivery during automatic shifting

• Category: Heavy Truck ZF 12TRAXON AMT Transmission Main Shaft Gear Repair Spare Parts

Material & Advantages

1. One-piece forged alloy steel blank with full carburizing quenching, high tooth surface hardness, strong anti-impact and anti-fatigue performance under continuous heavy torque

2. Ultra-precise CNC ground gear teeth, smooth meshing with low noise, uniform stress distribution to avoid local tooth abrasion and point corrosion

3. Strict OEM outer diameter, tooth profile and inner spline dimension, perfect fit original mainshaft without cutting or polishing modification during overhaul

4. Optimized tooth root transition design to reduce stress concentration, effectively prevent tooth breakage under frequent automatic shifting

5. Stable meshing clearance reduces vibration, eliminates abnormal gear grinding noise and extends service life of matched countershaft gear and synchronizer assembly

6. Adapt to long-distance full-load logistics transportation, mountain climbing and frequent start-stop heavy-duty working conditions

Application Scenarios

• Replace pitted, broken-tooth, deformed original constant gear marked 1358 302 203 for ZF 12TRAXON gearbox

• Repair vehicle faults including insufficient power output, abnormal meshing noise, jumping gear and shifting vibration

• Complete main shaft and countershaft disassembly overhaul for heavy truck logistics fleets

• Assemble matched mainshaft, synchronizer assembly and countershaft gear following official ZF assembly standards

Supply & After-sale

• MOQ: 1 piece

• Warranty: 3–6 months (exclude overload operation, poor lubrication, improper installation and natural abrasion aging)

• Packaging: Independent shockproof foam + thick carton sealed packaging to prevent tooth collision damage

• Remarks: Confirm gearbox model 12TX series before order placement to guarantee matching accuracy

Gearboxes assembly include brand ZF, Eaton, FAST, Allison, DONGFENG, DC, Benz, volvo, HOWO, WLY etc. Gearboxes parts includegear, synchronizer, PTO, housing, bearings, shaft, top cover, sensors, wireness, repair kits... etc.

Our products have been exported to more than 50 countries and regions such as Korea, Chile, Russia, Kazakhstan, USA, Ecuador, Turkey, Iran, Africa, Latin America, etc., and have been unanimously recognized by customers.

In the future, we will be committed to creating higher-end quality and more intimate service. And a more comfortable customer experience to build Yongliwei company into an auto parts supplier with excellent corporate culture, scientific development concept and continuous innovation ability.

Shiyan Yongliwei Industry and Trading Co., Ltd. is a modern enterprise integrating design, development, production and sales of gearbox assembly and gearbox parts.

Our company was founded in Hubei province, China, and has been specialized the truck gearboxes in Chinese offline market for 21 years .Our parts are the leader of gearboxes area in the China now.

Our company was set up in the largest truck parts production base in the world –Shiyan city, Hubei, China, to meet the demand for products in the Asia and South American markets, a professional international trade sales team was born in Hubei in 2021.

Shiyan Yongliwei is focusing on creating high quality, high technology and high standard gearboxes and its parts.

* 8000 square meters of large warehouse.

* A number of maritime, land, air transport international logistics companies work closely together.

* To provide you with convenient, fast and low-cost e-commerce one-stop service.