🔧 Crosstrek - Front Lower Ball Joint Replacement

On your Crosstrek, the lower ball joint connects the steering knuckle to the lower control arm. When it wears, it can cause clunks, loose steering, uneven tire wear, or a failed safety inspection.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours (both sides)

---

⚠️ Safety & Precautions

• 🧯 Support the vehicle on jack stands; never rely on a jack.
• 🔥 Work on a cool suspension/brake area; hot parts can burn you.
• 🧤 Wear eye protection when using a puller/hammer (rust can fly).
• 🧵 Don’t let the steering knuckle hang by the brake hose/ABS wire.
• 🔩 If you loosen control-arm bushing bolts, final torque must be done at ride height.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves
• 19mm socket
• 14mm socket
• 17mm socket
• Breaker bar
• Torque wrench (20–150 ft-lbs range)
• Needle-nose pliers
• Flathead screwdriver
• Hammer (16–24 oz)
• Punch set
• Pry bar
• Wire brush
• Penetrating oil
• Ball joint separator/puller (specialty)

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front lower ball joint - Replace in pairs - Qty: 2
• Ball joint pinch bolt and nut - Replace in pairs - Qty: 2
• Cotter pin (ball joint castle nut) - Replace in pairs - Qty: 2
• Anti-seize compound - Qty: 1

---

📋 Before You Begin

• Park on level ground, leave the transmission in gear, and set the parking brake.
• Chock the rear wheels with wheel chocks.
• Break loose the front lug nuts 1/2 turn using a 19mm socket and breaker bar before lifting.
• Spray penetrating oil on the ball joint pinch bolt area and the ball joint stud nut area, then wait 5–10 minutes.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and remove the front wheel

• Lift the front using a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Remove the wheel using a 19mm socket.

Step 2: Free any brackets/lines that limit movement

• Remove small brake hose/ABS wire brackets from the strut/knuckle area using a 12mm socket if equipped; if your brackets are different, use the correctly sized socket that fits snugly.
• Support the knuckle so it won’t tug the brake hose (use a stable support and reposition as needed).

Step 3: Remove the ball joint stud cotter pin and castle nut

• Straighten and pull the cotter pin using needle-nose pliers.
• Remove the ball joint castle nut using a 17mm socket.
• If the stud spins, press up on the control arm.

Step 4: Separate the ball joint stud from the lower control arm

• Use a pry bar to apply light upward pressure on the control arm near the ball joint.
• Use a ball joint separator/puller (specialty) to pop the stud out of the control arm.
• Don’t hammer on the stud threads.

Step 5: Remove the ball joint pinch bolt from the steering knuckle

• Locate the pinch bolt that clamps the ball joint into the knuckle.
• Remove the pinch bolt using a 14mm socket and breaker bar.
• If the bolt is stuck, tap it out gently using a hammer and punch set.

Step 6: Pull the ball joint out of the knuckle

• Install the ball joint separator/puller (specialty) and press/pull the joint downward out of the knuckle.
• If it’s rusted in, re-apply penetrating oil, then try again—avoid prying hard against the CV axle boot.
• Rust is the #1 reason these fight you.

Step 7: Clean the knuckle bore and install the new ball joint

• Clean the ball joint bore in the knuckle using a wire brush.
• Apply a thin film of anti-seize compound to the outside of the new ball joint (avoid the stud threads).
• Insert the new ball joint into the knuckle fully seated by hand, then snug it into place using the ball joint separator/puller (specialty) if needed.
• Align the ball joint’s notch/groove with the pinch bolt slot in the knuckle.

Step 8: Install the new pinch bolt and torque it

• Install the new pinch bolt and nut using a 14mm socket.
• Torque to 45 Nm (33 ft-lbs) using a torque wrench (20–150 ft-lbs range).

Step 9: Reconnect the ball joint stud into the control arm and torque it

• Guide the ball joint stud into the lower control arm.
• Install the castle nut using a 17mm socket.
• Torque to 50 Nm (37 ft-lbs) using a torque wrench (20–150 ft-lbs range).
• Continue tightening only as needed to align the cotter pin hole, then install a new cotter pin using needle-nose pliers.

Step 10: Reinstall brackets and the wheel

• Reinstall any brackets you removed using the correct-size socket.
• Reinstall the wheel and hand-thread lug nuts.
• Lower the vehicle and torque lug nuts in a star pattern using a 19mm socket and torque wrench (20–150 ft-lbs range): Torque to 120 Nm (89 ft-lbs).

---

✅ After Repair

• With the vehicle on the ground, turn the steering lock-to-lock and confirm nothing binds or pulls on the ABS wire/brake hose.
• Test drive at low speed first; listen for clunks and confirm straight braking.
• Get a front alignment check recommended after suspension work.
• Re-check the pinch bolt and lug nut torque after 25–50 miles.

---

💰 DIY vs Shop Cost

Shop Cost: $350-$750 (parts + labor, typically both sides)

DIY Cost: $60-$180 (parts only, both sides)

You Save: $290-$570 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

---

🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.