The 1957–1960 Ford Truck Dual-Flex Drop Front Leaf Springs (Pair) by Posies (Part #D160F) is a performance front suspension lowering kit engineered specifically for third-generation Ford F-100 pickups (1957, 1958, 1959, and 1960).
Designed to lower the front ride height by 2-1/2" to 3", these springs combine modern full-taper leaf technology with a dual-leaf configuration to provide a sleek, lowered stance, superior ride comfort, and a 100% increase in safety compared to traditional single mono-leaf springs.
Product Overview & Performance
Traditional multi-leaf front springs on early F-100 trucks are notoriously rigid, producing a harsh, bouncy ride over road imperfections. While mono-leaf springs are often used to drop front ends, they lack redundancy and risk catastrophic failure if the single leaf breaks.
Posies solves this with their Dual-Flex full-taper leaf technology. The two-leaf tapered design provides the clean, minimalist look of a mono-leaf with a secondary full-length leaf for fail-safe safety. Coupled with Posies' signature moly-nylon SuperSlide buttons, inter-leaf friction is eliminated, allowing the front beam axle to react smoothly to bumps while maintaining tight, predictable handling.
Key Features & Design Highlights
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2-1/2" to 3" Lowered Front Stance: Drops the front chassis 2.5" to 3" below factory ride height for a level, aggressive truck stance without sacrificing suspension travel.
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Dual-Flex Full-Taper Technology: Two tapered leaves deliver a progressive spring rate with built-in safety redundancy over mono-leaf designs.
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SuperSlide Inter-Leaf Damping: Moly-Nylon friction-reduction buttons eliminate metal-on-metal squeaks, binding, and rust for a softer, quieter ride.
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Pre-Installed Front Bushings: Comes complete with pre-pressed front spring eye bushings to speed up chassis installation.
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Includes Shorter U-Bolts: Package includes shorter U-bolts specially sized to match the thinner, high-efficiency 2-leaf pack thickness.
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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: D160F) |
| Vehicle Application |
1957, 1958, 1959, and 1960 Ford F-100 2WD Trucks |
| Suspension Location |
Front Beam Axle |
| Stance Drop |
Approx. 2-1/2" to 3.0" Lowered Front Stance |
| Leaf Architecture |
Dual-Flex Tapered 2-Leaf Pack with SuperSlide Buttons |
| Included Hardware |
Sold as Pair; Pre-Installed Front Bushings; Shorter U-Bolts Included |
| Package Weight & Size |
Approx. 42.0 lbs per Pair (48.00" L x 9.00" W x 6.00" H) |
Technical Installation Notes
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Bump Stop Clearance: Because this kit lowers the front axle by 2-1/2" to 3", factory frame bump stops must be trimmed down or removed entirely to allow full suspension travel.
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Axle Alignment: After installing lowering front springs on early Ford F-100 beam axles, verify front axle caster and toe-in alignment to prevent uneven tire wear.
