Parts for your 2004 Mitsubishi Pajero-Universal joints

2004 Mitsubishi Pajero universal joints (uni joints): purpose, care, and when to replace

Yes—the 2004 Mitsubishi Pajero (NM/NP series) is fitted with universal joints on its front and rear propeller shafts. This is documented in Mitsubishi’s factory service manual for NM/NP models (Propeller Shaft/Group 27A), and also covered in common Australian workshop guides such as Gregory’s and Max Ellery’s manuals, which detail inspection and service of the prop shafts and their uni joints. While the front axle half‑shafts use CV joints, the prop shafts that run between the transfer case and differentials use uni joints to handle torque at changing angles.

What do they do? The uni joints let the Pajero’s prop shafts transmit drive even as the drivetrain angles change with suspension movement, body flex and engine torque. They’re critical to smooth, reliable 4WD operation—particularly with the Super Select transfer case engaged—whether cruising the highway or crawling through ruts out bush.

Servicing-wise, many OE Pajero uni joints are sealed-for-life, but plenty of aftermarket replacements include grease nipples. During routine servicing, a tech should check for axial and radial play, dry or cracked seals, rust-coloured dust around the caps, binding when the shaft is articulated, and any signs of heat. If the joints are greaseable, a quality lithium complex or moly grease does the trick, re-grease at regular intervals, especially after water crossings or beach work.

• Common symptoms they’re due: a clunk on take-off or shifting from reverse to drive, a squeak at low speed, and a vibration under load (often 60–90 km/h) that changes with throttle.
• If there’s any roughness or measurable play, replace the joint—or the complete prop shaft if the yokes are flogged out.

Replacement tips for the home mechanic: mark the flanges to keep the shaft phasing the same, support the shaft to avoid stressing the slip joint, and torque the flange bolts to spec from the manual. After installation, check phasing and runout, a mis-phased or bent shaft will vibe like mad. Lifted Pajeros are harder on uni joints due to steeper working angles—inspect more often if you’ve fitted a suspension lift or carry heavy loads.

Regularly inspecting the uni joints (every service or 15,000 km, and more frequently if you tour off-road) helps prevent collateral damage to flanges, the transfer case, or diffs. Use reputable parts and don’t ignore early warning noises—leaving a crook uni too long can turn a simple job into an expensive driveline repair.

FAQs

Does a 2004 Pajero use uni joints or CV joints?
It uses both. The propeller shafts (front and rear) run universal joints, as confirmed by the Mitsubishi factory service manual for NM/NP models. The front axle half-shafts use CV joints. Different jobs, different joints.

How often should Pajero uni joints be greased or inspected?
If your joints are greaseable, a good rule is every 10,000 km—or after water crossings or beach work. Even sealed joints should be inspected at each service (about 15,000 km) for play, noise, or leaking caps, and more often on lifted or heavily loaded vehicles.

Can a highway-speed vibration be caused by a worn uni joint?
Absolutely. A worn or dry uni joint can cause a vibration that changes with throttle. Check for slop at the shaft, rust dust at the caps, or stiffness when the shaft is articulated. Do also rule out tyres, wheel balance and rear bushes while you’re there.