🔧 Express 3500 - Shock Absorber Replacement

Replacing worn shocks restores ride control, reduces bouncing, and improves braking stability. On your Express 3500, you can replace the front and rear shocks one axle at a time without removing springs.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

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⚠️ Safety & Precautions

• 🛑 Never work under a vehicle supported only by a jack; always use jack stands.
• 🛑 Chock the wheels that stay on the ground to prevent rolling.
• 🛑 Support the axle/control arm before removing a shock so nothing drops suddenly.
• 🛑 Wear eye protection; rust and dirt fall when bolts break loose.
• 🔋 Battery disconnect is not required for shock replacement.

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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
• 21mm socket
• 1/2" drive breaker bar
• 1/2" drive torque wrench (30-250 ft-lbs range)
• Ratchet (1/2" drive)
• Socket set: 15mm, 18mm, 21mm
• Combination wrench set: 15mm, 18mm, 21mm
• Deep socket set: 15mm, 18mm
• Pass-through socket set (specialty)
• Locking pliers
• Penetrating oil
• Wire brush
• Trim clip tool
• Flathead screwdriver
• Safety glasses
• Mechanic gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Front shock absorbers - Replace in pairs - Qty: 2
• Rear shock absorbers - Replace in pairs - Qty: 2
• Shock mounting hardware kit - Optional but recommended - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Chock the wheels (if doing rear shocks first, chock the front wheels).
• Spray penetrating oil on all shock fasteners 10-15 minutes before removal.
• Do one axle at a time.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Loosen lug nuts and safely lift the van

• Use a 21mm socket and breaker bar to loosen (do not remove) the lug nuts on the axle you’re working on.
• Lift at the appropriate jacking point using a floor jack (rated 3-ton minimum).
• Set the frame onto jack stands (rated 3-ton minimum).
• Remove the wheels using the 21mm socket.

Step 2: Replace the rear shocks (leaf-spring axle)

• Place the floor jack (rated 3-ton minimum) under the rear axle tube to lightly support it.
• Clean exposed threads with a wire brush, then re-apply penetrating oil.
• Remove the lower shock bolt using an 18mm socket and 18mm wrench.
• Remove the upper shock fastener(s) using an 18mm socket and 18mm wrench.
• Remove the shock. If stuck, wiggle it while slightly raising/lowering the axle with the floor jack.
• Install the new shock in the same orientation.
• Hand-start all fasteners first to avoid cross-threading.
• Tighten the upper and lower fasteners with a torque wrench: Torque to 95 Nm (70 ft-lbs) (upper) and Torque to 140 Nm (103 ft-lbs) (lower).
• Repeat on the other rear side.

Step 3: Replace the front shocks (front suspension)

• Support the lower control arm with the floor jack (rated 3-ton minimum) so it can’t drop.
• Locate the top shock stem/nut area. You may need to move a small splash shield or liner section.
• If a liner/splash shield blocks access, remove clips using a trim clip tool and flathead screwdriver.
• Remove the lower shock bolt using an 21mm socket and 21mm wrench.
• Remove the upper shock nut using a deep socket (often 15mm) and a pass-through socket set (specialty).
• A pass-through socket lets you turn the nut while a tool passes through the middle to hold the shock stem from spinning.
• If needed, carefully hold the stem with locking pliers on the flat spot only.
• Remove the shock downward through the wheel well.
• Install the new shock. Start the upper nut by hand first, then align and install the lower bolt.
• Tighten fasteners with a torque wrench: Torque to 30 Nm (22 ft-lbs) (upper stem nut) and Torque to 150 Nm (111 ft-lbs) (lower bolt).
• Reinstall any splash shield/liner clips using the trim clip tool.
• Repeat on the other front side.

Step 4: Reinstall wheels and lower the van

• Reinstall wheels and hand-start lug nuts.
• Lower the van off the jack stands using the floor jack.
• Torque lug nuts in a star pattern using a torque wrench: Torque to 190 Nm (140 ft-lbs).

Assumption: Torque specs shown match common Express 3500 hardware; verify with GM service information if fasteners differ.

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✅ After Repair

• Do a quick visual check that all shock bolts/nuts are fully seated and bushings look straight (not twisted).
• Road test at low speed first; listen for clunks over bumps.
• Re-check lug nut torque with a torque wrench after 25-50 miles.
• No alignment is typically required for shocks alone, but get an alignment if you had abnormal tire wear or steering pull.

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💰 DIY vs Shop Cost

Shop Cost: $600-$1,200 (parts + labor)

DIY Cost: $200-$600 (parts only)

You Save: $400-$600 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 hours.

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🎯 Ready to get started?

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