Parts for your 2020 Subaru Legacy-Driveshafts

2020 Subaru Legacy driveshafts

Based on Subaru’s own technical literature for the 2020 Legacy (BT chassis) and widely available service/parts catalogues, this model is fitted with driveshafts. The Legacy runs Subaru’s Symmetrical All-Wheel Drive as standard, which uses a two-piece propeller shaft (often called the driveshaft) to send power to the rear differential, plus CV driveshafts (half‑shafts) at the front and rear hubs. In other words, driveshafts are absolutely relevant to the 2020 Subaru Legacy.

What do they actually do? The propeller shaft carries torque from the transmission to the rear diff, while the CV driveshafts at each corner deliver that torque to the wheels through constant velocity joints that allow up‑and‑down suspension travel and steering angles without binding. It’s the backbone of how the Legacy puts power to all four tyres with that planted, surefooted Subaru feel.

For day‑to‑day motoring, there’s no scheduled replacement interval for driveshafts, but they should be inspected at every service. The big watch‑outs are split CV boots (you’ll often see dark grease flung around the inner wheel or control arms), clicking on turns, vibrations on acceleration, or a thump when going on/off throttle. The prop shaft’s centre support bearing and universal joints should be checked for play or noise, on many late‑model Subarus these components are serviced as an assembly if worn.

• Keep an eye on CV boots for tears or leaking grease, fix promptly to avoid joint wear.
• If you feel new vibes at 60–100 km/h, have the propeller shaft and wheel/tyre balance checked.
• Use matched tyre sizes and tread depths on all four corners—AWD systems dislike rolling radius mismatches and it can stress the driveline.
• After any axle work, torque the axle nut to spec and recheck after a short drive if recommended by the repairer.

Replacement is straightforward for a trained tech. Quality reman or new OE‑spec CV shafts are fine for most drivers, off‑roaders or those towing regularly may prefer premium units with upgraded boots. If one front CV shaft has failed from boot damage and the opposite side is the same age and condition, replacing in pairs can save a second visit. Finally, make sure any leaking transmission or diff seals at the shaft interfaces are addressed at the same time—that’s cheap insurance.

Popular questions

How can someone tell if a driveshaft is failing on a 2020 Subaru Legacy?
Common signs include clicking while turning (usually a front outer CV joint), vibration under load at motorway speeds, clunks on take‑off, or visible CV boot grease. Any of these warrant a professional inspection before the problem snowballs.

Does AWD mean more frequent driveshaft maintenance?
Not necessarily more frequent, but it does mean being a bit fussier. Keep tyres matched, service on time, and inspect boots and the prop shaft support bearing regularly. Do that and the driveline tends to be very long‑lived.

Is it OK to drive briefly with a torn CV boot?
It’s risky. Once the boot tears, grease escapes and grit gets in, and the joint can wear quickly. Short local trips to a workshop may be fine, but delaying repair often turns a cheap boot replacement into a full CV shaft replacement.