🔧 Wrangler - Control Arm Replacement

Replacing the control arms on your Wrangler restores proper axle location, ride control, and alignment stability. Your Wrangler uses solid axles with front and rear upper/lower control arms, so the basic process is similar, but replace only one arm at a time so the axle does not shift out of position.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours for one pair

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⚠️ Safety & Precautions

• ⚠️ Work on level, solid ground only. Never rely on a jack alone.
• ⚠️ Use jack stands under the frame, then use the floor jack to lightly support the axle.
• ⚠️ Replace control arms one at a time. Removing multiple arms can let the axle rotate or shift.
• ⚠️ Do not fully tighten the control arm bolts while the suspension is hanging. Final tightening must be done at normal ride height.
• ⚠️ Wear safety glasses and gloves. Rust, dirt, and metal flakes can fall while working underneath.
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 18mm socket
• 21mm socket
• 18mm wrench
• 21mm wrench
• 1/2-inch drive ratchet
• 1/2-inch drive breaker bar
• 1/2-inch drive torque wrench rated to 150 ft-lbs
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Wheel chocks
• Rubber mallet
• Pry bar 18-inch
• Paint marker
• Tape measure
• Penetrating oil
• Wire brush
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front lower control arm - Qty: 2 if replacing both front lowers
• Front upper control arm - Qty: 2 if replacing both front uppers
• Rear lower control arm - Qty: 2 if replacing both rear lowers
• Rear upper control arm - Qty: 2 if replacing both rear uppers
• Control arm mounting bolt and nut kit - Qty: 1 if bolts are rusty or damaged

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📋 Before You Begin

• 🅿️ Park your Wrangler on flat ground, shift into 1st gear, and set the parking brake.
• 🧱 Place wheel chocks in front of and behind the tires that stay on the ground.
• 🛞 You usually do not need to remove the wheels, but removing them can give more room.
• 🧴 Spray penetrating oil on the control arm bolts and nuts at least 10-15 minutes before removal.
• 🖊️ Use a paint marker to mark the position of the old control arm bolts before loosening them.
• 📏 A control arm locates the axle. It is a strong metal link with rubber bushings at both ends.
• 🔩 A bushing is the rubber part inside the arm end. It lets the arm move quietly without metal-on-metal contact.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift and Support Your Wrangler

• Use wheel chocks to secure the wheels that will stay on the ground.
• Use a floor jack rated 3-ton minimum to lift the frame near the control arm you are replacing.
• Place jack stands rated 3-ton minimum under the frame rails.
• Lower your Wrangler gently onto the jack stands.
• Use the floor jack to lightly support the axle near the control arm being replaced.
• Keep the axle lightly supported.

Step 2: Identify the Control Arm Being Replaced

• Use a flashlight and safety glasses to inspect the control arm.
• The lower control arms are the longer, lower links between the frame and axle.
• The upper control arms are shorter and mounted higher on the axle.
• Use a tape measure to compare the new control arm length to the old one before removal.
• If the new arm is adjustable, set it to the same length as the old arm using a tape measure.

Step 3: Mark the Bolt Positions

• Use a paint marker to mark the bolt head, washer, and bracket position at both ends of the control arm.
• This helps you return the hardware close to its original position.
• Marks make reassembly easier.

Step 4: Loosen the First Control Arm Bolt

• Use an 18mm socket and 18mm wrench on upper control arm hardware if equipped with 18mm fasteners.
• Use a 21mm socket and 21mm wrench on lower control arm hardware if equipped with 21mm fasteners.
• Use a 1/2-inch drive breaker bar if the bolts are tight.
• Loosen the axle-side bolt first, but do not remove it yet.
• If rust is heavy, clean exposed threads with a wire brush and apply penetrating oil.

Step 5: Loosen the Second Control Arm Bolt

• Use the matching 18mm or 21mm socket and wrench to loosen the frame-side bolt.
• Keep the floor jack lightly touching the axle so the bolt does not bind.
• If the bolt is hard to slide out, use the floor jack to raise or lower the axle slightly.
• Do not force the bolt with excessive prying because the bracket can bend.

Step 6: Remove the Old Control Arm

• Use the correct 18mm or 21mm socket and wrench to remove the nuts completely.
• Slide the bolts out by hand.
• If a bolt sticks, tap it gently with a rubber mallet.
• Use an 18-inch pry bar only if the arm needs slight movement to come free.
• Remove the old control arm from the brackets.
• Do one arm at a time.

Step 7: Install the New Control Arm

• Place the new control arm into the frame and axle brackets by hand.
• Install the original bolts by hand through the brackets and bushings.
• If the holes do not line up, use the floor jack to slightly raise or lower the axle.
• Use an 18-inch pry bar carefully to nudge the axle bracket only if needed.
• Install the nuts by hand first to avoid cross-threading.

Step 8: Snug the Bolts, Do Not Final Torque Yet

• Use the correct 18mm or 21mm socket and wrench to snug the bolts until the arm is seated.
• Do not fully tighten the bolts while the suspension is hanging.
• The rubber bushings must be tightened at normal ride height to avoid twisting and early failure.

Step 9: Repeat for the Matching Side

• If replacing a pair, move to the opposite side and repeat Steps 2-8.
• Use the same 18mm or 21mm socket and wrench sizes as needed.
• Replace left and right control arms in pairs when possible for even suspension behavior.

Step 10: Set the Suspension at Ride Height

• Use the floor jack to raise the axle until your Wrangler is near normal ride height.
• If the wheels were removed, reinstall them and lower your Wrangler onto the ground before final torque.
• Use jack stands carefully if you need working space while keeping the suspension loaded.
• Loaded suspension means the vehicle weight is sitting on the axle like it does while driving.

Step 11: Final Torque the Control Arm Bolts

• Use a 1/2-inch drive torque wrench rated to 150 ft-lbs with the matching 18mm or 21mm socket.
• For front lower control arm bolts: Torque to 169 Nm (125 ft-lbs).
• For rear lower control arm bolts: Torque to 169 Nm (125 ft-lbs).
• For front upper control arm bolts: Torque to 102 Nm (75 ft-lbs).
• For rear upper control arm bolts: Torque to 102 Nm (75 ft-lbs).
• Use a wrench on the nut side while torquing the bolt side if the nut turns.

Step 12: Final Visual Check

• Use a flashlight and safety glasses to inspect every control arm bracket.
• Confirm each bolt is fully seated through the bracket and bushing.
• Confirm the paint marks are close to their original positions.
• Make sure no brake hoses, ABS wires, or parking brake cables are stretched or pinched.

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✅ After Repair

• ✅ Test drive slowly at first and listen for clunks, pops, or steering pull.
• ✅ Recheck the control arm bolts after the first short drive.
• ✅ Get a professional alignment check if steering wheel position changed, tires show uneven wear, or adjustable arms were installed.
• ✅ If replacing front lower arms or adjustable arms, caster angle may change. Caster is the steering angle that helps your Wrangler track straight.
• ✅ Re-torque the hardware after 50-100 miles, especially if new bushings or aftermarket adjustable arms were installed.

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💰 DIY vs Shop Cost

Shop Cost: $350-$900 per pair (parts + labor)

DIY Cost: $120-$450 per pair (parts only)

You Save: $230-$450 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.

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🎯 Ready to get started?

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