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Eaton K-4370 Upper and Lower Countershaft (Single PTO) Kit | Endurant HD OEM
Eaton K-4370 Upper & Lower Countershaft (Single PTO) Kit for Endurant HD transmissions. Includes S-3211 upper + S-3210 lower countershaft, thrust washers & snap rings. Direct OEM replacement for Single PTO models EEO-17F112C & EEO-18F112C—global shipping & lifetime warranty. Get your quote today!
Product Details
Eaton K-4370 Upper and Lower Countershaft (Single PTO) Kit – Endurant HD OEM
Factory-direct OEM replacement kit for Eaton Cummins Endurant HD automated transmissions with Single PTO configuration. The K-4370 is the official Upper & Lower Countershaft Service Kit, providing complete replacement countershaft assemblies for Single PTO models. Essential for restoring precise gear engagement, torque capacity, and long-term durability in high-mileage heavy-duty applications.
Why Choose the Eaton K-4370 Countershaft Kit?
- Complete OEM Single PTO service kit – both upper and lower countershafts in one box
- Precision-machined welded countershaft assemblies for perfect gear mesh
- Includes all required thrust washers and snap rings
- Direct fit for Single PTO Endurant HD transmissions
- Restores full torque handling and smooth shifting
- 28 years of OEM-level manufacturing experience at Volgen Power
Technical Specifications – Complete Kit Contents
| Item # | Description | Part Number | Qty |
|---|---|---|---|
| 1 | Upper Countershaft Assembly | S-3211 | 1 |
| 2 | Lower Countershaft Assembly | S-3210 | 1 |
| 3 | Lower and Upper Countershaft Flat Washer | 10001532 | 2 |
| 4 | Lower and Upper Countershaft Snap Ring | 4302082 | 2 |
Kit Weight: Approx. 70 lbs (31.8 kg) • Note: Countershaft Bearing Kit (K-4652 or K-4484) and Lube Tube Kits (K-4384 / K-4386) are sold separately and recommended for complete service.
Vehicle & Transmission Compatibility
Designed exclusively for Eaton Endurant HD Single PTO models:
| Transmission Models | Application Notes |
|---|---|
| EEO-17F112C / EEO-17F112C-XD | 17-speed Endurant HD Single PTO |
| EEO-18F112C | 18-speed Endurant HD Single PTO |
Popular Applications: Freightliner Cascadia, Peterbilt 579/567, Kenworth T680, International LT – Single PTO configurations paired with Cummins X15 engines.
Important Caution: Converting between Single PTO and Dual PTO transmissions voids the Eaton Cummins warranty and may cause component damage. This K-4370 kit is for Single PTO only (upper countershaft S-3211). For Dual PTO models use K-4371 (upper countershaft S-3212).
Installation Highlights
Requires main housing access (transmission removal recommended). Replace both countershaft assemblies as a set with new thrust washers and snap rings. Always install new countershaft bearings (K-4652 Hard Lock recommended) and perform main shaft end-play adjustment if the clutch/main housing was disturbed. Total service time: 8–12 hours. Reference Eaton Endurant HD Service Manual TRSM0950.
Why Buy from Volgen Power?
- 100% genuine OEM specification – direct from the Eaton Cummins supply chain
- Factory direct pricing – up to 40% lower than dealerships
- Lifetime warranty on all transmission components
- Fast global shipping from China + USA warehouse stock
- Trusted by fleets in 70+ countries since 1996
- Full technical support & PTO configuration guidance
Frequently Asked Questions
What is the difference between K-4370 and K-4371?
K-4370 is for Single PTO models (upper countershaft S-3211). K-4371 is for Dual PTO models (upper countershaft S-3212). Converting between PTO types voids warranty.
Is this kit compatible with Hard Lock Bearing Design?
Yes – it works with both original and Hard Lock countershaft bearings (K-4652 recommended for 2022+ units).
Should I replace the bearings and lube tubes at the same time?
Yes – we strongly recommend installing Countershaft Bearing Kit K-4652 and both Upper/Lower Lube Tube Kits (K-4384 + K-4386) for a complete refresh.
Do I need special tools for installation?
Standard service tools plus countershaft bearing installation tools are required. Full procedure in TRSM0950.
What is your warranty on this kit?
Lifetime warranty against manufacturing defects when installed correctly.
Need the Dual PTO version instead?
VIEW K-4371 DUAL PTO KIT →
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