How Many U-Joints Does a Truck Have?

Somewhere between 2 and 7 or more, depending on the truck’s drivetrain configuration — mainly whether it’s 2WD or 4WD, and how long the wheelbase is.

U-Joint Count by Configuration

Why the Count Changes

Two factors drive nearly all of the variation:

• Wheelbase length — a long-bed or crew-cab truck’s rear driveshaft is often too long to run as one piece, so it’s split into two sections with a carrier bearing supporting the middle. That split point adds a u-joint.
• 2WD vs. 4WD — 4WD adds an entire second driveshaft running from the transfer case to the front differential, which adds its own u-joint(s).

One Thing Not to Assume: Modern Front Axles Often Use CV Joints, Not U-Joints

Most modern light-duty 4WD/AWD trucks with independent front suspension use constant-velocity (CV) joints at the front axle shafts, not U-joints — CV joints handle the wider steering angle better. The “up to 5–7 U-joints” figure above applies to solid front axle setups (common on heavier-duty and older trucks), not to independent-front-suspension 4WD trucks. If you’re counting joints on a specific vehicle, check whether its front axle is solid or independent before assuming U-joints are there at all.

Related reading: What Is a Universal Joint? · What Is a Carrier Bearing? · 2-Piece vs. 1-Piece Driveshaft: What’s the Difference?

Danny Ni Engineering & Mechanical Systems Writer

Danny Ni is an engineering-focused technical writer at SYZ Machine, specializing in mechanical components, linkage systems, and real-world application engineering. His work covers aftermarket vehicle parts, industrial joints, and mechanical principles, translating complex engineering concepts into practical insights for engineers, fabricators, and industry buyers.

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