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Plymouth Pb300 Radius Arm Nut Kits

Plymouth Pb300 Radius arm nut kits

Starting at low prices, AutoBuffy stocks multiple radius arm nut kits from top OE-quality brands for the Plymouth Pb300. The radius arm nut secures the radius arm to the frame bracket, keeping the front axle located correctly during acceleration and braking. A loose or stripped nut lets the arm shift, causing unpredictable steering and accelerated bushing wear.

Signs your Plymouth Pb300 needs a new radius arm nut kit

  • Clunking or thudding from the front suspension when accelerating from a stop or braking hard
  • Steering wheel pulls to one side or feels vague and inconsistent on straight roads
  • Visible side-to-side slop in the radius arm when the wheel is rocked by hand with the vehicle on a lift
  • Rapid or uneven front tire wear, particularly on the inner or outer shoulder
  • Front-end shimmy or vibration that worsens under load or on rough pavement
  • Failed alignment that cannot hold its caster setting after adjustment

Which radius arm nut kit should you buy for your Plymouth Pb300?

The main decision is thread size and hardware grade — not all kits are interchangeable even within the same model family. Look for a kit that includes the nut, any required washers, and a cotter pin or retaining clip so you have everything needed for a complete, rattle-free installation.

OEM-specification kit
Best for
Restoring factory fit and torque rating exactly as engineered
What you get
Correctly sized nut, hardened washers, and retaining hardware matched to factory specs
Grade 8 aftermarket kit
Best for
Upgraded durability on trucks used for towing, off-road, or heavy hauling
What you get
High-tensile hardware that resists stretching and loosening under sustained high loads
Full radius arm hardware kit
Best for
High-mileage vehicles where all fastener hardware is worn or corroded
What you get
Nut, bolt, washers, cotter pin, and sometimes a new bushing retainer in one package
Stainless-steel corrosion-resistant kit
Best for
Vehicles in rust-belt, coastal, or high-moisture environments
What you get
Stainless hardware that resists seizing and simplifies future service without cutting frozen fasteners

Replacing the radius arm nut kit on a Plymouth Pb300

Moderate⏱ 1–2 hoursFloor jack and jack standsBreaker bar and appropriate socket setTorque wrenchPenetrating oil (for corroded hardware)Cotter pin pliers or needle-nose pliers

Raise and support the front of the vehicle safely, then remove the old nut and any retaining hardware, applying penetrating oil if the threads are corroded. Install the new nut and washers from the kit, tighten to the manufacturer's specified torque range using a torque wrench, and secure the cotter pin or retaining clip fully. Schedule a front-end alignment immediately after to restore proper caster and prevent uneven tire wear.

Frequently asked questions

How much does it cost to replace radius arm nut kits on a Plymouth Pb300?
Parts start at low prices at AutoBuffy. The hardware itself is inexpensive; most of the cost comes from labor if the nut is seized or if the radius arm bushing needs replacement at the same time. DIY installation keeps the job affordable, especially when you buy the full hardware kit upfront.
Can I drive my Plymouth Pb300 with a loose or missing radius arm nut?
No. A loose or missing radius arm nut lets the arm shift fore and aft under braking and acceleration. This creates unpredictable steering, accelerates bushing and bracket wear, and in severe cases can allow the arm to disengage from the frame bracket entirely, causing loss of vehicle control.
Do I need an alignment after replacing the radius arm nut on my Plymouth Pb300?
Yes, a front-end alignment is strongly recommended. The radius arm controls caster angle, and any movement of the arm — even slight — changes that setting. Reinstalling the nut without an alignment check risks uneven tire wear and a steering pull that won't go away on its own.
How often should the radius arm nut be inspected on a Plymouth Pb300?
Inspect the nut and its retaining hardware during every suspension service or at least once a year if the vehicle sees off-road use, heavy towing, or high-mileage highway driving. Salt and moisture accelerate corrosion on the threads, making periodic checks especially important in northern or coastal climates.
Should I replace the radius arm bushing at the same time as the nut kit on my Plymouth Pb300?
It is strongly advisable. A worn nut often means the bushing has been moving under load and is already degraded. Replacing both at the same time avoids a return labor job shortly after and ensures the arm is correctly located and cushioned, giving you a proper baseline for the new alignment.
Are radius arm nut kits vehicle-specific, or will a generic hardware kit work on my Plymouth Pb300?
Thread pitch, diameter, and grade requirements vary across platforms, so a generic nut is a risk. Always match the kit to the Plymouth Pb300 by year and drivetrain. Kits listed specifically for your application guarantee correct thread engagement depth and the load rating needed to hold torque under suspension cycling.

More parts for your Plymouth Pb300

Radio CapacitorEngine Timing ChainOxygen SensorPower Window RelaySteering Idler ArmA/C ThermostatBrake Rotor SetRadius Arm Hardware Kit

Radius arm nut kits for other Plymouth models

Plymouth PB350Plymouth PB300 VanPlymouth PB100Plymouth PB200 VanPlymouth TraildusterPlymouth PB100 Van