Eaton 6th Gear Countershaft Assembly Countershaft 4303238 28 Teeth
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Eaton 6th Gear Countershaft Assembly Countershaft 4303238 28 Teeth

4303238 is the Eaton Fuller heavy-duty integrated countershaft assembly for classic Roadranger RT/RTO series manual heavy truck transmissions, used on North American long-haul semi-trailer tractors. It is the core auxiliary layshaft assembly with fixed gear structure (including 6th gear position / 28T gear specification variant), meshing with the main shaft gears to distribute torque and achieve full-speed shifting. Made of high-strength alloy steel with precision forging and carburizing quenching heat treatment, it features high torsional rigidity, wear resistance and fatigue resistance, solving countershaft gear damage, spline wear, shaft bending, abnormal noise, vibration and chronic shifting failure faults.
Availability:
Quantity:
  • 4303238

  • Eaton

Product parameters

Basic Info

    Alias: 6th gear countershaft assembly, layshaft, auxiliary countershaft

    • Part Number: 4303238

    • Brand: Eaton Fuller (Eaton Roadranger)

    • Compatible Gearbox: Eaton Fuller RT/RTO series heavy-duty manual Roadranger transmissions

    • Applicable Vehicles: North American long-haul semi-trailer trucks, heavy-duty tractors with Eaton Fuller 10/13 speed Roadranger gearboxes

    • Category: Heavy Truck Drivetrain Parts – Eaton Fuller Countershaft Assembly

    • Net Weight: approx. 10kg

    • Package Contents: 1 x Eaton Fuller countershaft assembly 4303238

    • Material: High-strength alloy steel, precision forging, carburizing quenching heat treatment, integrated gear structure including 28T gear



Material & Advantages


  • High-strength alloy steel with professional heat treatment, excellent torsion resistance, fatigue resistance and wear resistance

  • Integrated gear structure (28T 6th gear), stable meshing under heavy torque loads, reducing transmission noise

  • OEM overall dimensions for direct replacement, matching original bearings, snap rings and gear components

  • Resists bending, tooth breakage and spline fatigue damage under continuous long-haul heavy load operation

  • Fixes persistent gearbox abnormal noise, driveline vibration, 6th gear failure and shifting jamming faults

  • Designed for North American highway heavy haulage and variable load road conditions



Application


For overhaul and repair of heavy-duty semi-trucks fitted with Eaton Fuller Roadranger RT/RTO series manual transmissions. Replace worn, damaged or misaligned countershaft assemblies causing noise and gear damage. Install matched bearings, snap rings and gaskets, check shaft end float and gear meshing clearance, verify lubrication before road use.



Origin & Lead Time

In stock, delivery within 1–3 working days; bulk orders: 4–7 days; sea freight: 10–24 days


MOQ & Packing

MOQ: 1 piece
Warranty: 6 months, not covered for improper programming, water damage, overvoltage and unauthorized circuit modification
Packing: Anti-static bag + shockproof foam + reinforced export carton

About yongliwei

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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.

Company information (1)

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.

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* 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.


About Us
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