Dodge P420 Series Parts & Accessories

Dodge P420 Series Parts & Accessories

The Dodge P420 Series sits in the upper range of Dodge's P-series forward-control commercial van platform, built for demanding cargo and payload applications that required heavier chassis ratings than the P300 and P375 could handle. These vans used the 360 cubic inch LA V8 as their primary powerplant in most configurations, supported by heavy-duty front axles, larger brake systems, and multi-leaf rear spring packs rated for the increased load. Drivetrain parts for the 360 LA are well-stocked through Mopar and aftermarket suppliers.

Popular Upgrades

The most commonly ordered P420 Series parts include carburetor rebuild kits for the Holley and Carter units fitted to the 360 LA V8, exhaust manifold gaskets and replacement manifolds, and complete ignition service kits. Electronic ignition conversion modules for the pre-electronic distributor setup are a top-rated upgrade that eliminates the ongoing maintenance demands of points-based systems. Heavy-duty brake components including dual-circuit master cylinders, wheel cylinders, and high-friction brake shoes are also frequently ordered given the P420's payload capacity.

Performance & Handling

The 360 LA V8 in P420 Series trucks benefits considerably from aftermarket tube headers, which reduce the significant exhaust restriction of the factory cast manifolds. Pairing headers with a Holley 600 or 750 CFM four-barrel carburetor on the 360 produces a strong improvement in throttle response and pulling power under load, making these modifications popular on working vans and restorations alike.

What brake system does the P420 Series use?

P420 Series vans used a drum brake configuration front and rear, with heavier-rated hardware than lighter P-series models to match the higher GVW. Upgrading to a dual-circuit master cylinder is a high-priority safety improvement on any P420 still running a single-circuit setup. Wheel cylinder sizes are application-specific, so confirming front and rear drum diameter before ordering is recommended.

Are cooling system parts readily available for the P420 Series 360 engine?

Yes, the 360 LA V8 has excellent aftermarket cooling system support. Replacement water pumps, thermostats, radiator hoses, and fan clutches are available from multiple suppliers. Heavy-duty aluminum radiators designed for the 360 LA are also available for trucks that run at high coolant temperatures under sustained load.

Browse related categories including Mopar parts and accessories, exhaust systems and headers, and suspension components for more parts across your build.