🔧 Sierra 1500 - Front Strut Assembly Replacement

Your Sierra uses front coilover strut assemblies, which combine the shock absorber and coil spring into one unit. Replacing the complete loaded strut assembly is the safest beginner-friendly method because it avoids compressing the coil spring.

Difficulty Level: Intermediate | Estimated Time: 2.5-4 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a flat, solid surface only. Never work under your Sierra supported by a jack alone.
• ⚠️ Use jack stands. Jack stands are fixed supports that hold the truck safely after lifting.
• ⚠️ Do not remove the center nut on the strut shaft unless the spring is safely compressed with professional equipment.
• ⚠️ Replace front struts in pairs so braking, steering, and ride height stay balanced.
• ⚠️ Keep hands clear when lowering or raising the lower control arm. The suspension is heavy.
• ⚠️ Battery disconnect is not required for 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
• 22mm lug nut socket
• Ratchet wrench
• Breaker bar 1/2-inch drive
• Torque wrench 1/2-inch drive
• 15mm socket
• 18mm socket
• 21mm socket
• 15mm wrench
• 18mm wrench
• 21mm wrench
• Pry bar 18-inch
• Dead blow hammer
• Paint marker
• Penetrating oil
• Trim clip remover
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front loaded strut assemblies - Qty: 2
• Front strut upper mounting nuts - Qty: 6
• Front strut lower mounting bolts and nuts - Qty: 4

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📋 Before You Begin

• Park your Sierra on level ground and set the parking brake.
• Place wheel chocks behind the rear wheels.
• Loosen the front lug nuts slightly before lifting the truck.
• Spray penetrating oil on the upper strut nuts and lower strut bolts. Let it soak for several minutes.
• Use complete loaded strut assemblies. A loaded strut already includes the spring, mount, and shock assembled together.
• An alignment is strongly recommended after replacing front struts.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen the Front Wheel Lug Nuts

• Use a 22mm lug nut socket and breaker bar 1/2-inch drive to loosen each front lug nut about half a turn.
• Do not remove the lug nuts yet.
• Break them loose before lifting.

Step 2: Lift and Support the Front of the Truck

• Use a floor jack (rated 3-ton minimum) under the front frame crossmember to raise the front of your Sierra.
• Place jack stands (rated 3-ton minimum) under the frame rails on both sides.
• Lower the truck gently onto the jack stands.
• Give the truck a light push by hand to confirm it is stable before working.

Step 3: Remove the Front Wheels

• Use the 22mm lug nut socket and ratchet wrench to remove the lug nuts.
• Remove both front wheels and set them flat under the frame as an extra safety backup.

Step 4: Mark the Strut Position

• Use a paint marker to mark the position of the lower strut mount against the lower control arm.
• This helps place the new strut close to the original position before alignment.

Step 5: Support the Lower Control Arm

• Place the floor jack (rated 3-ton minimum) under the lower control arm near the ball joint area.
• Raise the jack just enough to lightly support the lower control arm.
• The lower control arm is the large metal arm that holds the bottom of the wheel hub and suspension.

Step 6: Remove the Lower Strut Bolts

• Use an 18mm socket, 21mm socket, 18mm wrench, or 21mm wrench as needed to remove the two lower strut mounting bolts and nuts.
• If the bolts are tight, use the breaker bar 1/2-inch drive.
• Use a dead blow hammer to gently tap the bolts out if they are stuck.
• Do not hit the threaded end directly unless the nut is loosely installed to protect the threads.

Step 7: Remove the Upper Strut Nuts

• Open the hood.
• Use a 15mm socket and ratchet wrench to remove the three upper strut mounting nuts from the top of the strut tower.
• Support the strut with one hand while removing the final nut.
• Do not remove the large center nut on the strut assembly.

Step 8: Remove the Old Strut Assembly

• Lower the floor jack (rated 3-ton minimum) slightly under the lower control arm to create room.
• Use a pry bar 18-inch carefully if the strut needs help clearing the lower control arm.
• Remove the strut assembly through the wheel opening.
• Move slowly and watch brake hoses.

Step 9: Install the New Loaded Strut Assembly

• Position the new front loaded strut assembly into the strut tower.
• Start the three upper mounting nuts by hand first.
• Use a 15mm socket and ratchet wrench to snug the upper nuts, but do not fully torque them yet.

Step 10: Align the Lower Strut Mount

• Use the floor jack (rated 3-ton minimum) to raise or lower the control arm until the lower strut holes line up.
• Use the pry bar 18-inch gently if needed to align the bolt holes.
• Install the lower strut bolts and nuts by hand first to avoid cross-threading.

Step 11: Tighten the Strut Mounting Hardware

• Use an 18mm socket, 21mm socket, 18mm wrench, or 21mm wrench to tighten the lower strut bolts.
• Use a torque wrench 1/2-inch drive to tighten the lower strut bolts to Torque to 190 Nm (140 ft-lbs).
• Use a 15mm socket and torque wrench 1/2-inch drive to tighten the upper strut nuts to Torque to 50 Nm (37 ft-lbs).

Step 12: Repeat on the Other Side

• Use the same tools and steps to replace the strut assembly on the opposite front side.
• Always replace both front struts as a pair.

Step 13: Reinstall the Front Wheels

• Install the wheels by hand and thread the lug nuts on by hand first.
• Use a 22mm lug nut socket and ratchet wrench to snug the lug nuts in a star pattern.
• The star pattern means tightening across the wheel instead of going around in a circle.

Step 14: Lower the Truck and Torque the Lug Nuts

• Use the floor jack (rated 3-ton minimum) to lift the truck slightly off the jack stands.
• Remove the jack stands (rated 3-ton minimum).
• Lower your Sierra until the tires touch the ground fully.
• Use the 22mm lug nut socket and torque wrench 1/2-inch drive to tighten the lug nuts in a star pattern to Torque to 190 Nm (140 ft-lbs).

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✅ After Repair

• Push down firmly on the front bumper and release. The truck should rise and settle quickly without bouncing several times.
• Turn the steering wheel lock-to-lock while parked and listen for clunks or rubbing.
• Test drive slowly first. Listen for loose hardware, clunks, or steering pull.
• Recheck the lug nut torque after 25-50 miles using the 22mm lug nut socket and torque wrench 1/2-inch drive.
• Schedule a front wheel alignment as soon as possible to protect the tires and restore steering accuracy.

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💰 DIY vs Shop Cost

Shop Cost: $650-$1,100 (parts + labor)

DIY Cost: $250-$550 (parts only)

You Save: $400-$550 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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