Parts for your 2018 Toyota Mark x-Universal joints

2018 Toyota Mark X universal joints: what they do and how to keep them sweet

Based on Toyota’s service literature for the GRX130/GRX133 series (Propeller Shaft section of the Toyota Repair Manual) and the Toyota Electronic Parts Catalogue for the GRX133, the 2018 Toyota Mark X is fitted with universal joints (U‑joints) on its two‑piece propeller shaft, along with a centre support bearing. The steering intermediate shaft also uses small U‑joints. On this model, the prop‑shaft U‑joints are typically sealed, staked‑in, and not greasable.

On a rear‑drive Mark X, the universal joints are the little legends that let the propeller shaft transfer torque from the transmission to the rear diff while the suspension and driveline move about. Because the gearbox and diff aren’t perfectly in line, the U‑joints handle the changing angles without binding, keeping things smooth when taking off, cruising the motorway, or rolling over bumps. If they wear out, the first giveaway is usually a light squeak at low speeds, then a clunk on take‑off or a shudder around 60–100 km/h.

Servicing for a 2018 Mark X is mostly about inspection rather than lubrication, because the factory U‑joints are sealed. A good workshop will check for red dust around the caps, split seals, play or stiffness in the joint, and any slop at the flange bolts. If there’s noticeable free play, brinelling, or binding, it’s time for replacement.

Here’s the catch many owners don’t realise: Toyota’s staked U‑joints generally aren’t designed to be replaced on their own. The official path is to fit a new propeller shaft assembly, then road‑test and check for vibration. Some driveline specialists can de‑stake and press in quality replacements, then balance the shaft, which can be a sharp way to save coin—just make sure they’ll balance it to OE spec.

When replacing, new flange bolts and correct torque procedures matter, as does marking the shaft to maintain its original phasing. After fitment, a balance check and a short, varied‑speed test drive helps confirm it’s all behaving. For everyday care, keep an ear out for squeaks and a feel out for new vibrations, especially after whacks to the underbody or adventurous gravel driving. Catching a tired U‑joint early protects the centre bearing, diff pinion, and transmission output, and keeps the Mark X feeling tight and tidy.

• Common symptoms: low‑speed squeak, take‑off clunk, highway vibration
• Inspection interval: at regular services or any time a new vibration appears
• Replacement: full prop‑shaft assembly (OE) or specialist rebuild and balance

FAQs

Does the 2018 Toyota Mark X use universal joints or CV joints in the driveshaft?

It uses universal joints on its two‑piece propeller shaft, plus a centre support bearing. That setup is confirmed in Toyota’s GRX130/133 Repair Manual and EPC. Some modern cars use CVs on the shaft, but the Mark X sticks with conventional U‑joints.

How often should the U‑joints be replaced on a 2018 Mark X?

There’s no fixed kilometre interval. They’re inspected during routine servicing and replaced when there’s play, binding, red dust, or noise. Life varies with use, rough roads and water ingress shorten it, gentle highway running doesn’t.

Can the Mark X’s U‑joints be greased?

From factory, they’re sealed and not greasable. If a driveline specialist has rebuilt the shaft with greaseable service U‑joints, then yes—follow their advice and give them a pump at regular services.