The 1962–1963 Ford Thunderbird SuperSlide Multi-Leaf Rear Drop Leaf Springs (Pair) by Posies (Part #363) is a direct bolt-in rear lowering spring kit engineered specifically for third-generation "Bullet Bird" Ford Thunderbirds (1962–1963 Hardtops, Sedans, and Convertibles).
Designed to lower the vehicle's rear stance by approximately 2-1/2" to 3" below original stock height, these heavy-duty leaf packs deliver a sleek, low-profile custom stance while significantly improving ride quality over aged or rigid factory leaf springs.
Product Overview & Performance
Third-generation Thunderbirds are heavy full-size luxury cars, and their factory rear leaf springs frequently suffer from sagging, metal-to-metal binding, and harsh bottoming over time. Posies addresses this by integrating their signature moly-nylon SuperSlide buttons between leaf tips. This eliminates inter-leaf friction, squeaks, and rust binding, allowing the leaf pack to flex smoothly and provide a compliant, refined ride tailored to the Thunderbird chassis.
These springs drop directly into original 1962–1963 T-Bird frame mounting pockets and shackle locations without requiring cutting, welding, or frame alterations.
Key Features & Design Highlights
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2-1/2" to 3" Lowered Stance: Drops the rear chassis 2.5" to 3" below stock specifications for a level, sleek profile without sacrificing ride comfort.
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Fits Sedans & Convertibles: Engineered to accommodate the specific weight distribution and frame requirements of both 1962–1963 Thunderbird hardtops and convertibles.
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Direct Chassis Bolt-In: Mounts directly into factory front frame hangers and rear shackle locations.
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SuperSlide Inter-Leaf Technology: Moly-Nylon friction-reduction buttons eliminate leaf-on-leaf grinding for a quieter, softer ride.
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American-Made Quality: Hand-assembled and tour-tested in the USA using premium tempered spring steel with proven 100,000+ mile reliability.
Technical Specification Matrix
| Feature / Metric |
Technical Specification Detail |
| Manufacturer & Part # |
Posies Rods & Customs (P/N: 363) |
| Vehicle Application |
1962 and 1963 Ford Thunderbird (Hardtop, Sedan, Convertible) |
| Stance Drop |
Approx. 2-1/2" to 3.0" Lowered Rear Stance |
| Inter-Leaf Damping |
Moly-Nylon SuperSlide Friction-Reduction Buttons |
| Quantity Supplied |
Sold as a Pair (2 Rear Leaf Springs) |
| Package Weight & Size |
Approx. 80.0 lbs per Pair (56.00" L x 7.00" W x 6.00" H) |
Installation Notes & Recommendations
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Associated Bushings & Hardware: To ensure smooth operation and eliminate suspension play, Posies recommends replacing original, worn frame bushings and shackle hardware with new spring eye and shackle bushing kits during installation.
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Driveline Pinion Angle Check: When lowering a heavy full-size car by 2-1/2" to 3", verify drive shaft working angles and rear axle pinion angle alignment during setup to prevent driveline vibration.
