PMF HD Long Arm 4-Link Kit for 2017-2022 Ford F-250/350

Want tighter front-end control, better caster settings, and a more planted feel—without going to a full subframe lift?

The PMF HD Long-Arm 4-Link Kit replaces the factory radius arms with fully adjustable upper and lower links, delivering precise axle placement and caster correction across a wide range of lift heights.

• Fits: 2017, 2018, 2019, 2020, 2021, 2022 Ford Super Duty F-250, F-350, F-450 (4x4)
• Intended use: Daily driving, towing, high-HP street/strip, and off-road builds needing improved front geometry

Why Choose the PMF HD Long-Arm 4-Link?

• Full adjustability: Both upper and lower links are adjustable—dial in caster and wheelbase precisely across 4.5"–12" lift ranges.
• Stronger mounting: Independent frame mount for the lower link ties into the frame and the OEM radius-arm mount—far stronger than bucket-only designs.
• Heavy-duty build: Laser-cut 1/4" steel brackets and 2" OD DOM link bars built to handle real-world abuse.
• Bolt-on design: Installs without a subframe; retain your existing springs/shocks and lift hardware.

What’s Included

• Adjustable Link Bars: (2) lower and (2) upper 2" OD DOM tubes with adjusters/joints
• HD Frame/Axis Brackets: Laser-cut 1/4" mounts, including independent lower-link frame mount
• Hardware: Grade-rated installation hardware and spacers as required
• Instructions: Model-specific guidance for setup and caster/wheelbase adjustment

Choose Your Front Setup

• Long-Arm 4-Link (this kit): Replaces radius arms for better axle control, improved on-center feel, and reduced bind through travel.
• Pair with your lift: Works with coil/coilover lifts in the 4.5"–12" range; aligns geometry for street, tow, and performance use.

Rear Blocks & U-Bolts

• This front-suspension kit does not include rear blocks/U-bolts. Retain your current rear setup or pair with your preferred rear components.

Leaf Pack Type (How to Pick)

• Not applicable to this front-only kit. If you’re refreshing the rear, match block height and U-bolt size to your existing leaf pack (Standard vs. Top-Mounted Overload).

Shock Options (Valved for This Application)

• This kit ships without shocks. It is compatible with your current shocks or with performance upgrades (Bilstein, Fox, King) matched to your lift height.

Important Notes

• Lift range: Designed to work from ~4.5" to 12" of front lift. For lifts over ~12", PMF recommends a subframe-based drop setup.
• Alignment: Professional alignment recommended after install to set caster/toe for best tracking and tire wear.
• Compatibility: Front-axle 4-link conversion replaces OEM radius arms; verify clearance with existing skid plates/aux brackets.

Who This Kit Is For

• Owners seeking precise steering feel and stable on-center tracking
• Tow rigs and high-horsepower builds needing repeatable caster and wheelbase settings
• Enthusiasts who want a bolt-on, heavy-duty long-arm 4-link without switching to a subframe

Questions? We’re Here to Help.

Need help confirming lift compatibility or link setup? Contact FASS Motorsports and we’ll get you dialed:

• Phone: 636-429-7020
• Email: info@fassmotorsports.com