The Opel GT, often called the "baby Corvette," is a classic German sports car that demands proper suspension care to deliver its signature handling. Whether you're restoring a GT to showroom condition or building a weekend canyon carver, choosing the right Opel GT suspension parts is critical. This guide covers the key components, upgrade options, and practical advice for keeping your Opel GT planted and responsive.
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Understanding the Opel GT Suspension System
The Opel GT uses a front suspension with upper and lower control arms, coil springs, and telescopic shock absorbers. The rear suspension is a live axle with leaf springs and shocks. While this setup was advanced for its time, modern driving expectations often call for improvements. Common issues include sagging springs, worn bushings, and leaking shocks. Understanding how each part contributes to ride quality and handling is the first step to making smart upgrade decisions.
Front Suspension Components
The front end features unequal-length A-arms, coil springs, and separate shock absorbers. The control arms connect to the chassis via rubber bushings that harden with age, causing vague steering. Inner and outer tie rods connect the steering rack to the spindles. Ball joints at the lower control arms wear over time and can lead to clunking noises.
Rear Suspension Components
The rear uses a solid axle located by semi-elliptic leaf springs. The springs serve both as the locating member and the springing medium. Shock absorbers are mounted separately. The leaf springs can sag or develop inter-leaf friction, reducing ride comfort. U-bolts and shackles should be inspected for corrosion.
Key Opel GT Suspension Parts and Their Functions
To restore or upgrade your Opel GT's suspension, focus on these essential parts:
Coil Springs and Leaf Springs
Front coil springs determine ride height and spring rate. Original springs often sag after decades. Replacement springs are available in stock and lowered (1–2 inch drop) versions. For the rear, leaf springs can be rebuilt with new leaves or replaced entirely. Parabolic leaf springs offer a smoother ride while maintaining load capacity.
Shock Absorbers
Modern shocks like Bilstein, KONI, or Monroe dramatically improve damping. The original hydraulic shocks are weak by today's standards. Gas-charged shocks resist fade and provide better control. For a street-driven GT, KONI adjustable shocks allow you to dial in comfort or firmness.
Bushings and Ball Joints
Rubber bushings in the control arms and sway bar mounts degrade with time. Polyurethane bushings reduce deflection and sharpen steering response at the cost of some NVH. Ball joints should be replaced in pairs if worn. Use only quality replacements from brands like Moog or TRW.
Sway Bars (Anti-Roll Bars)
The stock sway bars are thin. A thicker front sway bar reduces body roll without making the ride harsh. Many enthusiasts upgrade to a 22mm front bar and add a rear bar (the GT did not come with one). Pairing both improves cornering balance.
Steering Components
Tie rods, idler arms, and pitman arms must be in good condition for precise steering. Replace all steering linkage parts at once to avoid alignment issues.
Upgrading vs. Replacing: What's Right for Your Opel GT?
Deciding between stock replacement and performance upgrade depends on your goals.
Stock Restoration
If you're aiming for a concours-correct restoration, use OEM-spec parts. Original style springs, shocks, and rubber bushings maintain factory ride height and comfort. Many specialty suppliers offer NOS (new old stock) or exact reproductions. For a 100% stock car, avoid polyurethane bushings and lowered springs.
Performance Upgrade
For spirited driving or autocross, upgrades are warranted. A 1-inch lowered spring set improves the center of gravity. Pair with adjustable shocks for compression/rebound tuning. Polyurethane bushings tighten the front end. Add a rear sway bar to reduce understeer. These changes make the GT feel more modern without breaking the bank.
Riding Comfort vs. Handling
Street-driven GTs benefit from a mild upgrade: gas shocks, poly sway bar bushings, and stock ride height springs. This balances comfort with sharper turn-in. Full race suspension is too harsh for daily use.
Choosing Quality Parts and Brands
Not all suspension parts are created equal. Stick with reputable manufacturers.
Springs
- H&R: Lowered springs that retain good ride quality.
- Stock replacements: Sachs, Lesjöfors (OEM quality).
Shocks
- Bilstein: Gas pressure shocks, excellent for street and track.
- KONI: Adjustable, best for fine-tuning.
- Monroe: Economical, decent for daily drivers.
Bushings
- Energy Suspension: Polyurethane, precise fit.
- Prothane: Another poly option.
Brand caution
Avoid no-name ebay parts. They often fit poorly and wear quickly. Spend a little more for safety and longevity.
Installation Tips and Considerations
Suspension work on an Opel GT is DIY-friendly if you have basic tools and a jack.
Front Spring Removal
Use a spring compressor. The front coil springs are under load. Remove the shock, then control arm bolts carefully.
Leaf Spring Replacement
Support the rear axle, remove the U-bolts, and slide the leaf spring out. Replace the shackle bushings at the same time.
Torque Specifications
Tighten all bolts with the suspension loaded (wheels on the ground). Otherwise, bushings will be twisted and fail early.
Alignment
After any suspension work, get a front-end alignment. Toe and camber adjustments are available; caster is fixed.
Practical Final Recommendation
For most Opel GT owners, a balanced upgrade is best. Start with new shocks (Bilstein or KONI) and polyurethane front control arm bushings. Replace the front coil springs with stock or a mild drop. Add a front sway bar upgrade. For the rear, new leaf springs from a reputable supplier and new shock absorbers will transform the ride. Inspect and replace tie rods and ball joints if there is play. This combination restores handling and adds modern stability without sacrificing daily usability or requiring extensive fabrication. Always buy from known classic car parts specialists to ensure fitment. With proper parts, your Opel GT will handle as beautifully as it looks.