Adjustable Spring Plate Set - 69-86 Porsche 911 / 912

• • Application: Classic air-cooled Porsche platforms, including:

    • 1969–1986 Porsche 911 (including Coupe, Targa, and Cabriolet models)

    • 1969–1976 Porsche 912 / 912E

  • Adjustability: Provides ±1 1/2” of precise mechanical height adjustment. Fine-tuning can be done safely on an alignment rack or garage floor without removing the wheels or pulling the torsion bars.

  • Usage: Optimized for high-performance street touring, outlaw builds, track-day corner-balancing, and vintage PCA road racing.

Premium Construction

• • Material: 5mm Thick High-Strength Spring Steel. Precision laser-cut from ultra-durable spring steel engineered to withstand massive structural load under cornering without taking a permanent bend or cracking.

  • Precision Manufacturing: Fusion-Welded Splined Collars. Internal splined collars are precision-broached and robotically welded to the plate, ensuring a flawless, zero-slop connection over your factory or upgraded rear torsion bars.

  • Coating: Gold Zinc Plating. Finished with a premium gold iridescent zinc plating that seals out road moisture, salt, and track fluids, delivering long-lasting corrosion resistance and a beautiful vintage finish.

🇩🇪 Porsche 911/912 Rear Suspension Tech & Installation Notes

Upgrading the rear spring plates on a classic torsion-bar Porsche requires careful execution to protect the chassis and ensure accurate handling dynamics:

• ⚠️ Caution: Trailing Arm Pre-Load Energy: When unbolting the rear suspension, the factory spring plate rests under significant downward tension against the lower chassis calculator stop. Before loosening the final trailing arm and cover plate bolts, safely support the spring plate using a floor jack or a dedicated spring plate tension tool. Unbolting the plate while fully loaded can cause it to snap down violently, causing damage to the aluminum trailing arms or personal injury.

• 🧮 Baseline Torsion Bar Indexing: While these Sway-A-Way plates offer an exceptional ±1 1/2” range of adjustment, they must still be installed on the torsion bars at the correct initial angle. Porsche 911 rear torsion bars utilize an unequal spline count (typically 40 splines on the inner end and 44 splines on the outer end). This "hunting tooth" design allows you to micro-adjust the resting angle of the arm down to fractions of a degree by rotating the inner and outer splines in opposite directions. Always set your mechanical adjustment screw to its center position before indexing the bar to give yourself maximum up-and-down sweep.

• ❌ Deep-Clean the Torsion Tube Sockets: Debris, dried factory grease, and surface rust commonly accumulate inside the outer torsion tube housing over decades. Thoroughly clean out the female receivers using a wire brush and a penetrating solvent before inserting the new plates. If the splined collar doesn't slide over the torsion bar easily by hand, stop and check for burrs—forcing it on with a heavy hammer can damage the precision-broached internal teeth.

• ❌ Inspect the Spring Plate Bushings: Never install high-performance adjustable spring plates using worn, collapsed, or dry-rotted rubber bushings. For high-performance street touring or track use, replace them with fresh, high-durometer rubber or polyurethane bushings. Worn bushings will cause the spring plate to twist or bind under cornering, resulting in erratic rear camber alignment changes and irritating suspension squeaks.

• ❌ Anti-Seize is Essential: Apply a liberal coating of high-pressure, waterproof anti-seize or a specialized molybdenum grease to both the internal splines of the collar and the outer face of the torsion bar. This prevents moisture intrusion, halts metal-on-metal galling, and guarantees that the assembly can be effortlessly adjusted or serviced in the future. 

What’s Included

• One pair of adjustable spring plates

Warranty

Backed by a 1-year warranty for peace of mind.