2019-2023 Ford Ranger 2.3L 4x4 Lariat, XL, XLT HD Upgraded Rear Driveshaft. Replaces OEM KB3Z-4R602-A; KB3G-4K145-AB; KB3G-4K145-AD; KB3G-4K145-AE; KB3G4K145AB; KB3G4K145AD; KB3G4K145AE; KB3Z4R602A

Upgrade your 2019-2023 Ford Ranger 4×4 with our heavy-duty, HD rear driveshaft — the ultimate replacement for OEM shaft # KB3Z-4R602-A. Designed for Ranger owners who demand strength, performance, and reliability, this HD upgraded rear driveshaft delivers enhanced torque transfer, smooth power delivery, and long-lasting drivetrain durability.

Manufactured by EC Driveline to exacting standards, this rear driveshaft is engineered to outperform the stock KB3Z-4R602-A OEM unit right out of the box. Whether you’re hauling heavy loads, towing, off-roading, or simply driving daily — this upgraded driveshaft ensures your 4×4 Ranger performs as it should under stress.

Key Benefits & Features

• Improved power transfer & throttle response: The upgraded driveshaft significantly improves torque delivery from the transmission to the rear differential — giving you smoother, more direct power under acceleration. This upgrade helps eliminate the inefficiencies and flex common in factory driveshafts, resulting in sharper throttle response and more confident performance.  
• Enhanced durability & heavy-duty reliability: Built with high-strength components and larger, more robust universal joints, this HD driveshaft is engineered to withstand heavy loads, towing, and off-road punishment — far beyond what the standard OEM shaft was built for.  
• Reduced vibration and harshness (NVH): Precision engineering and proper balance reduce unwanted vibrations and driveline noise. Drivers often report a smoother, quieter ride — especially under load or during towing — thanks to the upgraded shaft’s superior construction and balance.  
• Better for towing, off-road, and high-load conditions: If you’re using your Ranger for towing trailers, hauling gear, or traversing rough terrain, this upgrade gives you the strength and resilience required to handle larger torque loads and extreme driving conditions without risking driveline failure.
• Direct fit — bolt-on replacement: This upgraded rear driveshaft replaces the factory KB3Z-4R602-A with no modifications needed. It’s engineered for a straightforward install so your Ranger is back on the road or trail quickly.  

Why Upgrade Your Ford Ranger Driveshaft (KB3Z-4R602-A)?

OEM driveshafts are often built to meet the “average driver” — fine for light commuting and everyday tasks, but prone to stress under high torque, heavy loads, towing, or off-road conditions. Upgrading to a heavy-duty rear driveshaft provides a more robust drivetrain backbone, delivering better performance, longevity, and reliability. For anyone who pushes their Ranger beyond “just driving,” this upgrade isn’t optional — it’s essential. 

Many Ranger owners have experienced vibration or driveline stress with the stock driveshaft during demanding conditions. In fact, issues with the original KB3Z-4R602-A driveshaft — including vibration or early wear — have been documented by other drivers online.  By replacing it with our HD upgraded driveshaft, you avoid those common problems and ensure a stable, smooth ride under load or at highway speeds.

Ideal For:

• Owners towing heavy loads or trailers
• Off-road and 4×4 enthusiasts
• Drivers hauling gear, tools, or cargo regularly
• Anyone upgrading suspension or tires
• Ranger drivers looking to eliminate driveline vibration or improve reliability

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🔧 Investing in this HD rear driveshaft for your 2019-2023 Ford Ranger 4×4 is a smart decision — whether you tow, haul, off-road, or simply want a more confident, vibration-free ride. With better torque transfer, smoother power delivery, and tougher construction, you’ll notice the difference immediately. Experience a stronger, more reliable drivetrain with the upgraded KB3Z-4R602-A replacement — built for real work and real trails.