🔧 Control Arms - Replacement

Assumption: This guide covers the front control arms on your Sierra. If you meant rear suspension arms, the procedure is different.

Replacing the control arms restores suspension alignment, ride quality, and steering feel when bushings or ball joints are worn. On your Sierra, the job requires careful support of the suspension and a follow-up alignment after installation.

Difficulty Level: Advanced | Estimated Time: 3-5 hours

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⚠️ Safety & Precautions

• Support the truck with jack stands; never work under a vehicle held up only by a jack.
• Keep hands clear of the coil spring area. Suspension parts can move suddenly.
• Brake hose and ABS wire stretch can occur when the knuckle is moved; do not let them hang.
• Use a spring compressor if the upper arm or knuckle movement creates spring tension.
• A wheel alignment is required after this repair.

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🔧 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
• Metric socket set
• Metric wrench set
• Breaker bar
• Torque wrench
• Ball joint separator (specialty)
• Pry bar
• Hammer
• Penetrating oil
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front upper control arm - Qty: 2
• Front lower control arm - Qty: 2
• Control arm hardware kit - Qty: 1
• New cotter pins - Qty: 1 set
• Front alignment - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Place wheel chocks behind the rear wheels.
• Loosen the front lug nuts slightly before lifting.
• If replacing both sides, do one side at a time so the other side can help support the suspension.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and secure the front end

• Use a floor jack to lift the front of the Sierra at the proper frame jacking point.
• Place jack stands under the frame and lower the truck onto them.
• Remove the front wheel with the lug wrench or metric socket, if equipped.

Step 2: Free the suspension for removal

• Use a metric socket set and breaker bar to loosen the control arm fasteners.
• Apply penetrating oil to stubborn bolts and let it soak.
• Support the steering knuckle or lower control arm with the floor jack so it does not drop suddenly.

Step 3: Remove the upper control arm

• Use the metric socket set and metric wrench set to remove the upper control arm mounting bolts.
• Use a ball joint separator to separate the upper ball joint from the steering knuckle if needed.
• Remove the arm from the vehicle.

Step 4: Remove the lower control arm

• Use the metric socket set and metric wrench set to remove the lower control arm mounting bolts.
• If the lower ball joint is attached to the knuckle, separate it with the ball joint separator.
• Remove the lower arm carefully while keeping the knuckle supported.

Step 5: Install the new control arms

• Position the new arm in place by hand first.
• Install the mounting bolts finger-tight using the metric socket set.
• Reconnect the ball joint to the knuckle as required.
• Torque to factory specification: use the exact OE torque values for the control arm bolts and ball joint nut from the service information.

Step 6: Reassemble and tighten at ride height

• Reinstall the wheel and snug the lug nuts with a metric socket.
• Lower the truck enough so the suspension is at normal ride height before final tightening of bushing bolts.
• Torque to factory specification: final-tighten all control arm pivot bolts at ride height.

Step 7: Finish the repair

• Reinstall the wheel fully and lower the truck.
• Torque the lug nuts to the factory wheel torque specification.
• Repeat on the other side if needed.

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✅ After Repair

• Check that all fasteners are tight and no brake lines or ABS wires are pinched.
• Start the truck and turn the steering wheel lock-to-lock while watching for rubbing.
• Test drive slowly first, then book a professional wheel alignment right away.

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💰 DIY vs Shop Cost

Shop Cost: $800-$1,800 (parts + labor)

DIY Cost: $250-$700 (parts only)

You Save: $550-$1,100 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.

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🎯 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.