Front Upper Control Arms — Optimized for DJM 6" Lower Control Arms

Correct Alignment • Restored Ball-Joint Geometry • Stronger Than Factory • Built for Lowered HD GM Trucks

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Lowering a heavy-duty GM truck is one of the most effective ways to modernize its stance, improve handling, and enhance its appearance—but only when it’s done the right way. For owners of 2001–2010 C1500HD, C2500HD, and C3500HD (2WD) trucks, a deep front drop requires proper suspension geometry, especially when using DJM 6-inch Lower Control Arms.

That’s where these DJM Front Upper Control Arms come in.

These upper control arms DO NOT change ride height, but they are absolutely essential for any truck lowered using DJM 6” lower arms. Their purpose is simple but critical:

• Restore proper caster and camber alignment

• Optimize ball-joint angles

• Improve steering accuracy

• Prevent premature tire wear

• Provide safe suspension operation at lowered height

When you drop a heavy-duty GM truck six inches in the front, the stock upper control arms cannot maintain proper alignment or ball-joint angles. These upgraded DJM upper arms are engineered specifically to solve that problem.

Featuring new all-steel ball joints, heavy-duty urethane bushings, and reinforced mounting geometry, these control arms ensure your lowered HD GM truck drives smoothly, safely, and correctly—exactly the way a professionally lowered truck should.

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FITMENT — ENGINEERED FOR GM HD 2WD TORSION BAR TRUCKS

These upper control arms fit:

(2WD torsion-bar models)

2001–2010 C1500HD (2WD)

2001–2010 C2500HD (2WD)

2001–2010 C3500HD (2WD Single Rear Wheel)

Does NOT fit:

• 4WD trucks

• Coil-spring front ends

• Trucks using non-DJM lower control arms

• 2011+ GM HD platforms

These arms are designed exclusively for lowered HD trucks using:

(Designed for use with DJM 6" Lower Control Arms only). Click here for Driver Side Control Arm and Passenger Side Control Arm

Without these upper arms, the suspension geometry will not be correct.

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WHY UPPER CONTROL ARMS ARE CRITICAL FOR A 6-INCH DROP

Most lowered truck owners focus only on the parts that directly change ride height — such as torsion keys, lowering arms, or spindles. However, lowering a heavy-duty GM truck six full inches puts tremendous demand on the upper control arm geometry.

The factory upper arms were never designed to work at the extreme angles that come with a 6-inch drop, which leads to:

• Misaligned caster

• Excessive negative or positive camber

• Ball joints near or at binding angles

• Bump-steer

• Uneven tire wear

• Poor handling and unsafe road feel

DJM’s Upper Control Arms correct all of these issues.

✔ Restores alignment range to OEM spec

✔ Provides proper ball-joint articulation

✔ Keeps control arm angles within safe limits

✔ Reinforces steering geometry for lowered ride height

These arms complete the suspension system and ensure that your 6" lower control arm drop functions exactly as intended.

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HIGH-STRENGTH FEATURES BUILT FOR HEAVY-DUTY TRUCKS

Your C1500HD, C2500HD, or C3500HD carries more weight and experiences more stress than a typical half-ton truck. These DJM Upper Control Arms are engineered with that in mind.

1. Heavy-Duty All-Steel Ball Joints (Installed)

Stronger and more durable than stock, and designed specifically for lowered applications.

2. Urethane Control Arm Bushings

Reduce deflection, increase responsiveness, and last longer than rubber bushings.

3. Reinforced Arm Construction

Fabricated from thick-gauge steel to handle torsion-bar pressure and HD truck weight.

4. Optimized Geometry for Ease of Alignment

Your alignment tech won’t struggle or max out adjustment cams.

5. Direct Bolt-On Replacement

No fabrication required. Installs in factory mounting points.

6. Built for Extreme Lowering

Arms are designed specifically for the geometry achieved from DJM 6-inch Lower Control Arms, guaranteeing compatibility and proper motion.

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BENEFITS OF USING THESE UPPER CONTROL ARMS

✔ Proper, Safe Alignment After a 6-Inch Drop

Caster and camber return to correct ranges for safe driving and uniform tire wear.

✔ Improved Steering Response

Reduced bump-steer and improved return-to-center steering feel.

✔ Longer Ball Joint Life

Optimized ball-joint angles prevent premature wear or binding.

✔ Better Ride Quality

Suspension components operate in their intended range, even at a much lower height.

✔ No Suspension Binding

Travel remains smooth, predictable, and safe.

✔ Better Fitment for Wide Wheels & Low Offset Rims

Correct suspension geometry helps avoid rubbing and unusual tire contact.

✔ The Only Proper Pairing for DJM 6-Inch Lower Control Arms

Stock arms cannot reproduce the correct geometry for this much drop.

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INSTALLATION OVERVIEW

Difficulty: Moderate

Time Required: 2–4 hours

Tools Needed:

• Jack + jack stands

• Impact gun or air tools

• Metric socket and wrench set

• Torque wrench

• Ball-joint separator

• Penetrating oil

General Installation Steps:

1. Support vehicle with jack stands

2. Remove stock upper control arms

3. Install new DJM upper arms using factory mounts

4. Torque hardware to spec

5. Reinstall and reconnect ball joints

6. Lower truck and perform mandatory professional alignment

Even if the truck "looks straight," alignment must be completed to:

• Prevent tire wear

• Ensure proper high-speed handling

• Achieve correct camber & caster

• Protect ball joints and bushings

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WHAT YOU MUST HAVE WITH THESE ARMS

These upper arms are required ONLY for trucks equipped with:

DJM 6-Inch Lower Control Arms.

If you do not have a DJM 6-inch drop setup installed, these upper arms alone will not lower your truck or solve alignment issues.

For a complete front suspension lowering system, pair these with:

• DJM 6" Lower Control Arms (Driver side Control Arm & Passenger Side Control Arm)

• DJM Front Shocks (1415)

• Properly adjusted torsion bars

This creates a full, engineered lowering system.

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PERFECT FOR ANY CUSTOM HD BUILD

• Daily-driven heavy-duty trucks
• Street performance builds
• Work trucks that need correct alignment
• Wide wheel and tire combinations
• Show-quality lowered trucks
• Static drop setups (3/6, 4/6, 2/6, etc.)

If you’re building a lowered HD truck that still needs to drive right, align correctly, and maintain safe geometry, these upper arms are mandatory.

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WHY BUY FROM GAUGE STORE?

Gauge Store is trusted by:

• Slamology builders

• Gauge Magazine feature trucks

• Professional shops and custom builders

• Thousands of GM truck owners

We offer:

✔ Fast shipping
✔ Guaranteed fitment help
✔ Deep suspension expertise
✔ Real-world installation knowledge
✔ Authorized DJM dealer components
✔ Support for future upgrades

We don’t just sell lowering parts—we build the trucks that define the lowered HD scene.