The 1957–1959 Ford Car SuperSlide Multi-Leaf Rear Drop Leaf Springs (Pair) by Posies (Part #357) is a direct bolt-in rear lowering solution engineered specifically for full-size 1957, 1958, and 1959 Ford passenger cars (Fairlane, Galaxie, Custom 300, Ranchero, and Station Wagons).
Designed to lower the vehicle's rear end by 3 inches below stock ride height, these spring packs deliver a classic lowered street rod profile while dramatically improving ride quality over worn, rigid factory multi-leaf packs.
Product Overview & Performance
Original late-1950s Ford leaf springs suffer from inter-leaf binding, rust accumulation, and severe metal-on-metal friction that causes a stiff, harsh ride over time. Posies solves this by integrating their signature moly-nylon SuperSlide buttons between leaf tips. This eliminates leaf-on-leaf grinding, allowing the spring leaves to flex freely for a smooth, quiet, and compliant ride.
These springs install directly into the original 1957–1959 Ford factory frame mounts and rear shackle locations without cutting, welding, or chassis modification.
Key Features & Design Highlights
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3" Custom Lowered Stance: Drops the rear chassis 3 inches below original stock height for a level, sleek profile without sacrificing suspension travel.
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Direct Chassis Bolt-In: Engineered to drop into stock frame hangers and shackle mounts on all full-size 1957–1959 Ford chassis.
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SuperSlide Inter-Leaf Damping: Moly-Nylon friction-reduction buttons eliminate metal-on-metal squeaks, rust binding, and stiff suspension motion.
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Pre-Installed Front Eye Bushings: Comes complete with pre-pressed front spring eye bushings to streamline installation.
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American-Made Quality: Hand-assembled and tour-tested in the USA using premium high-tensile tempered spring steel with proven 100,000+ mile reliability.
Technical Specification Matrix
| Feature / Metric |
Technical Specification Detail |
| Manufacturer & Part # |
Posies Rods & Customs (P/N: 357) |
| Vehicle Application |
1957, 1958, and 1959 Full-Size Ford Passenger Cars & Rancheros |
| Stance Drop |
3.0" Lowered Rear Stance |
| Inter-Leaf Damping |
Moly-Nylon SuperSlide Friction-Reduction Buttons |
| Included Hardware |
Sold as Pair; Pre-Installed Front Spring Eye Bushings |
| Package Weight & Size |
Approx. 76.0 lbs per Pair (55.00" L x 7.00" W x 5.00" H) |
Installation Notes & Recommendations
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Associated Mounting Hardware: To ensure long-term reliability and safety, Posies recommends pairing these springs with new replacement front eye bolt kits and rear shackles to replace rusted factory mounting hardware.
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Drive Line Pinion Angle: When dropping full-size 1950s Fords 3 inches, verify drive shaft working angles and rear axle pinion angle during installation to maintain smooth driveline operation.
