Parts for your 1998 Subaru Forester-Ball joints

1998 Subaru Forester Ball Joints — What They Do and When to Replace Them

Technical sources confirm the 1998 Subaru Forester (SF series) uses front lower ball joints. The Subaru Factory Service Manual for the 1998 Forester, Front Suspension section (“Lower Arm and Ball Joint”), and the Subaru Genuine Parts Catalogue (front lower ball joint PN 20206AA020, superseding 20206AA010) both list the ball joint as a defined service part. Major aftermarket catalogues also carry direct-fit front ball joints for this model. So, ball joints are very much relevant on a 1998 Forester.

On this Forester’s MacPherson strut front end, the ball joint links the lower control arm to the steering knuckle. It lets the hub pivot for steering while the suspension moves up and down, all while supporting vehicle weight. In short, it keeps the wheel pointing where it should, without binding. The unit is a sealed bearing-style joint with a protective rubber boot to keep grease in and grit out.

When ball joints wear, steering feel goes vague, braking can feel unsettled and tyre wear accelerates. Left too long, a badly worn joint can separate — that’s a genuine safety risk and an instant fail at WoF/regos. Most 1998 Foresters will need ball joints at some point in their life, especially if they’ve done big Ks or spent time on corrugations or coastal roads.

They’re not greaseable, maintenance is about inspection and timely replacement. At each service or tyre rotation (10–15,000 km), check for split boots, rust staining, or grease weep. With the wheel raised, a careful pry at the control arm/knuckle junction can reveal play. Road-test clues include:

• Clunks over bumps or while turning at low speed
• Steering wander, shimmy, or a knock on brake/accel transitions
• Uneven or rapid inner/outer tyre wear

Replacement is straightforward for a pro but has Subaru quirks. The knuckle pinch bolt can seize, allow penetrating oil, heat where safe, and be ready with a new genuine-spec bolt. Don’t lever on ABS rings or brake hoses. Fit quality OEM or reputable aftermarket joints, seat them squarely, and torque to the factory spec from the FSM. Always book a wheel alignment afterwards — camber/toe can shift when the joint position is renewed.

If the car sees gravel, towing, or beach use, shorten inspection intervals. Protecting the boot, washing off salt, and replacing joints at the first sign of play will keep the Forester tracking arrow-straight and treating its tyres kindly.

Popular questions about 1998 Subaru Forester ball joints

How long do the ball joints typically last?
It varies with use and climate. Many last 80,000–200,000 km, but coastal exposure, rough roads and big potholes can shorten that. The smarter move is to inspect them at every service and act on the first signs of play or a torn boot.

Do you need a wheel alignment after replacing ball joints?
Yes. Renewing a worn joint can change camber and toe slightly. A post-repair alignment keeps steering straight and prevents premature tyre wear.

Are the 1998 Forester’s ball joints greaseable?
No. They’re sealed units without grease nipples. If they’re noisy, loose, or the boot is split, replacement is the fix. Keeping the boots intact and free of road damage is the best preventative care.