Dodge RM300 Parts & Accessories

Dodge RM300 Parts & Accessories

The Dodge RM300 is a medium-duty conventional cab truck platform from Chrysler's commercial lineup, sharing its frame and drivetrain architecture with the broader R-series range. These trucks were built for sustained commercial use and long service lives, which means parts availability and mechanical reliability are the top priorities for current owners. Whether you are restoring an RM300 for vintage use or keeping a working truck on the road, the right sourcing makes the difference.

Popular Upgrades

The most frequently sourced parts for the RM300 include heavy-duty leaf springs, replacement shock absorbers, brake shoes and wheel cylinders, and carburetor rebuild kits. Exhaust manifolds and gaskets for the LA V8 engine family are also high-demand items given the age of these trucks and the heat cycling that wears out original manifold hardware over decades of use. Cooling system parts including radiators, hoses, and thermostats round out the most common needs.

Performance & Handling

The RM300 was available with the 318 LA V8 as a standard powerplant, with the 360 LA V8 available for heavier-duty applications. Both engines have extensive aftermarket support with performance intake manifolds, carburetor upgrades, and ignition system improvements widely available. The medium-duty suspension platform benefits from quality replacement hardware to maintain correct geometry and load capacity, particularly if the truck has seen commercial hauling use throughout its life.

What drivetrain parts are available for the Dodge RM300?

Drivetrain components for the RM300 including transmission rebuild kits, driveshaft U-joints, and differential parts are available through the Mopar commercial truck parts market. The RM300 shares significant drivetrain hardware with the D300 and W300 series, which expands your sourcing options considerably. Consult your build sheet or VIN decode to confirm axle ratios and transmission type before ordering rebuild kits.

Can I upgrade the brakes on a Dodge RM300?

Yes, the RM300 brake system can be upgraded with improved drum brake hardware or converted to disc brakes on the front axle with the appropriate adapter kit. Heavy-duty brake shoes with improved friction compounds improve stopping performance under load. Ensure any brake upgrade is matched to the axle weight rating and the truck's gross vehicle weight to maintain safe stopping distances.

Black Ops Auto Works stocks parts across the full Dodge commercial and performance catalog. Browse exhaust systems, suspension components, and Mopar parts and accessories for your RM300 build.