When restoring or maintaining a 1985 Alfa Romeo Spider Graduate, the rear suspension system often requires attention. This model, produced from 1985 to 1990, features a simple but effective design that can develop wear over time. Understanding the specific parts and their function is crucial for keeping the car’s handling sharp and ride comfortable.
Rear suspension parts for the 1985 Alfa Romeo Spider Graduate are not always interchangeable with earlier Spiders. The Graduate model introduced a rear anti-roll bar and revised shock mounts. If you’re shopping for replacement components, you’ll need parts that match these late-model specifications.
Rear Suspension Design of the 1985 Spider Graduate
The 1985 Alfa Romeo Spider Graduate uses a live rear axle located by four trailing arms and a Panhard rod. Coil springs sit between the axle and the chassis, with telescopic shock absorbers mounted separately. A rear anti-roll bar (sway bar) is attached to the axle and links to the chassis via drop links. This setup provides predictable handling but can become loose and noisy as bushings wear.
Common Rear Suspension Issues
Owners report several recurring problems:
- Worn trailing arm bushings: Causes rear-end wander and clunking.
- Sagging coil springs: Lowers ride height and reduces stability.
- Leaking shock absorbers: Leads to poor damping and bouncing.
- Failed Panhard rod bushings: Allows the axle to shift sideways, causing vague steering.
- Broken anti-roll bar drop links: Reduces roll control.
Key Rear Suspension Parts for the 1985 Graduate
Trailing Arms and Bushings
The four trailing arms (two per side) connect the axle to the chassis. The front arms are shorter; the rear arms are longer. Each arm has a rubber bushing at both ends. Over time, these bushings crack and lose compliance, leading to excessive play. Replace them with polyurethane bushings for longer life and improved accuracy, though they may transmit more vibration.
Coil Springs
The rear coil springs support the vehicle weight. Sagging is common after 100,000 miles. OEM-spec springs are available from aftermarket suppliers. For original ride height and comfort, choose standard-rate springs. If you plan to drive aggressively, progressive-rate springs offer a balance.
Shock Absorbers
The 1985 Spider Graduate uses separate rear shocks mounted vertically. Original shocks are hydraulic; modern gas-charged units provide better fade resistance. Brands like Koni, Bilstein, and KYB offer direct-fit replacements. Adjustable shocks allow fine-tuning for street or track use.
Panhard Rod
The Panhard rod locates the axle laterally. Its bushings wear, causing the axle to shift during cornering. A stock replacement Panhard rod is available, but an adjustable version lets you correct axle centering if the car has been lowered.
Anti-Roll Bar (Sway Bar) and Drop Links
The rear anti-roll bar is attached to the axle and connected to the chassis via two vertical drop links. These links have ball joints that wear out, causing clunks. Replace with OEM-style or aftermarket links. The bar itself rarely fails unless rusted.
Mounts and Hardware
All mounting points use rubber bushings or metal sleeves. Inspect the shock mounts at the chassis and axle; these can crack or corrode. Use new grade-8 bolts and lock washers during installation.
Replacement Tips for the Home Mechanic
- Lift safely: Use jack stands under the axle or frame. Never rely on a jack alone.
- Mark positions: Before disassembly, mark the Panhard rod length and axle alignment to ease reassembly.
- Bushing removal: Old rubber bushings can be pressed out or burned out. Polyurethane bushings require lubrication during installation.
- Torque specs: Tighten all suspension bolts with the vehicle at ride height (wheels on the ground) to avoid preloading bushings. Recommended torque for trailing arm bolts: 70–80 ft-lb. Panhard rod bolts: 60–70 ft-lb. Shock bolts: 40–50 ft-lb.
- Replace in pairs: Always replace shocks, springs, and bushings on both sides to maintain balance.
Buying Guidance: How to Choose Quality Parts
- OEM vs aftermarket: Original Alfa Romeo parts are expensive and often back-ordered. Reputable aftermarket brands offer comparable quality at lower cost.
- Materials: Look for zinc-plated hardware and rubber bushings that match OEM durometer. Polyurethane is acceptable but expect a firmer ride.
- Fitment: Verify that parts are specifically listed for the 1985–1990 Spider Graduate (chassis 115 series). Earlier Spiders (up to 1982) use different trailing arm lengths and mountings.
- Warranty: Many suspension components come with a limited warranty. Buy from established specialists who know Alfa Romeo parts.
Final Recommendation
For a stock restoration, order a complete rear suspension bushing kit (includes trailing arm bushings, Panhard rod bushings, and anti-roll bar mounts) from a dedicated Alfa Romeo supplier like Centerline or IAP. Pair it with a set of standard-rate coil springs and gas shocks from Koni or Bilstein. Replace the drop links and all hardware. This combination will restore the original handling characteristics without harshness. If you drive the car hard, consider adjustable shocks and polyurethane bushings. Avoid cheap unbranded parts—they rarely fit correctly and shorten the lifespan of other components.
Taking the time to replace these parts properly will transform how the 1985 Spider Graduate drives. The car will feel tight, track straight, and reward you on winding roads. Always torque fasteners to spec and align the rear axle after installation. With the right parts and careful work, your Spider Graduate’s rear suspension can remain reliable for many more miles.