SKU 4201

Performance & Fitment

• • Application: Fits classic Volkswagen models equipped with a factory or retrofitted Independent Rear Suspension (IRS) system (e.g., Late Beetle, Super Beetle, Karmann Ghia, Type 3).

  • Adjustability: Fixed Design. Delivers a consistent, rigid baseline for drivers who prefer a set-and-forget ride height with maximum plate stiffness.

  • Collar Configuration: Heavy-duty splined collar, precision jig-welded to guarantee absolute squareness and flawless alignment with the chassis torsion housing.

  • Fitment Note: Replaces flexible OEM plates to restore proper rear camber and toe tracking under aggressive driving conditions.

Premium Construction

• • Material: 1/4" High-Tensile Spring Steel. Unlike mild steel plates that can warp or permanently bow under heavy cornering or hard launches, this premium spring steel flexes under extreme load and returns to perfectly true alignment.

  • Splined Collar: Precision-broached internal splines ensure a tight, slop-free slip fit onto your rear torsion bars, distributing indexing loads evenly to eliminate spline stripping.

  • Coating: Silver Zinc Plating. Provides deep-reaching galvanic corrosion resistance, shielding the raw steel from road salt, moisture, and debris while maintaining a clean, classic finish.

🛠️ Aircooled IRS Suspension Tech & Installation Notes

Swapping rear spring plates on an aircooled IRS VW requires precise execution to avoid handling imbalances or dangerous spring-back injuries:

• ⚠️ Caution: Loaded Torsion Tension: Spring plates operate under massive mechanical tension. When removing old plates or setting up new ones, never simply pry the plate off the lower chassis stop without a proper spring plate retainer/unloader tool or a securely placed floor jack. Uncontrolled release of the spring plate can cause severe personal injury or frame damage.

• ❌ Setting the Index Angle (Ride Height): Because this is a fixed spring plate, your ride height is determined entirely by how you index the torsion bar. The inner and outer splines on VW torsion bars have different tooth counts (e.g., 40 inner, 44 outer). By rotating the bar one notch one way and the plate one notch the other (known as "clocking"), you can raise or lower the vehicle's rear end in tiny, precise increments.

• ❌ Torsion Bar Length & Spline Check: Always verify your torsion bar length before finalizing installation. VW utilized various bar lengths across different models and years (such as 21 3/4" or 24 11/16"). Ensure your new spring plate collar depth matches the outer extension of your torsion bars so the outer housing cover plates can torque down flush.

• ❌ Bushing Selection & Lubrication: Always replace your inner and outer rubber suspension grommets/bushings when installing new spring plates. If using high-performance Urethane or Polyurethane bushings, apply a liberal amount of water-resistant, silicone-based grease to the inner and outer surfaces of the plate collar. This prevents the infamous, annoying "VW squeak" during suspension cycling.

• ❌ Diagonal Trailing Arm Alignment: When bolting the IRS spring plate to the trailing arm flange, mock the bolts up loosely first. Because the trailing arm pivots on an angle, torque these bolts down only when the suspension is at its nominal ride-height position to prevent bushing twist and ensure proper toe/camber tracking. Use a drop of blue thread-locking compound on the mounting bolts. 

What’s Included

• Pair of standard spring plates

Warranty

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