GMC P15 Parts & Accessories

GMC P15 Parts & Accessories

The GMC P1500 half-ton step van is a forward control platform built for commercial delivery and route service applications, featuring a body-over-frame design that maximizes cargo capacity with a short overall footprint. These vehicles were widely used for parcel delivery, bread and milk routes, and utility work, and their mechanical simplicity means owners can keep them running with straightforward replacement parts for engines, brakes, and drivetrain components. The half-ton delivery designation reflects the chassis weight class and determines the correct brake hardware, spring rates, and powertrain components needed for safe and reliable operation. Independent operators, fleet managers, and restoration enthusiasts all depend on accurate, application-specific parts to keep these workhorses in service.

Popular Upgrades

Brake system maintenance is the most critical service category for any step van, and StopTech, Raybestos, and Bendix all manufacture replacement drum brake shoes, wheel cylinders, and master cylinder kits for P-series applications. AC Delco and Motorcraft offer replacement fuel pump, carburetor rebuild, and ignition component kits for the 250 inline-six and 305 or 350 small-block engines common to this platform. Gates timing belts and serpentine belts keep the accessory drive and valve timing systems in spec. Monroe and Gabriel manufacture replacement shock absorbers and struts for the front suspension that restore ride stability over years of daily route use.

Performance and Handling

The P-series step van uses a recirculating ball steering box and a front coil spring or torsion bar suspension depending on the generation, making alignment maintenance and steering component replacement important for safety in commercial use. Moog tie rod ends and idler arms are the preferred steering replacement parts for their precision fit and long service life under daily driving conditions. Rear leaf spring replacements from National Spring or Moog restore payload capacity and ride height lost to fatigued original springs on high-cycle fleet vehicles.

What engine was used in GMC P-series step vans?

GMC P-series step vans were equipped with a range of engines over their production history, including the 250 cubic inch inline-six, the 305 V8, and the 350 V8, with the specific engine varying by year and payload class. Later production years added the 4.3L V6 as a more fuel-efficient option for lighter-duty route applications. All of these engines have extensive replacement part availability from AC Delco, Edelbrock, and other major manufacturers, making routine maintenance and rebuilds straightforward.

How do I replace the brakes on a GMC P-series step van?

P-series step vans use drum brakes on all four corners in most configurations, with the front drum diameter and rear drum diameter varying by chassis weight class. A complete brake service involves replacing the shoes, hardware springs, wheel cylinders, and turning or replacing the drums, and should be performed in axle pairs for even braking performance. Bendix and Raybestos both publish detailed part number guides specific to the P-series by year and chassis code, ensuring you receive the correct shoe width and wheel cylinder bore for your application.

Why These Parts Fit Right

Parts in this collection are cataloged specifically to the GMC P1500 half-ton step van platform, ensuring brake, suspension, and engine components match the chassis specifications rather than being adapted from the lighter-duty passenger truck catalog. Fast shipping gets commercial operators back on route quickly, and expert support is available to confirm fitment for any specific year or configuration. Every order is backed by accurate application data so your parts arrive ready to install.

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