Custom Offsets carries performance, drivetrain, suspension, and exterior parts for the 1984 Chevrolet P20 Step-Van platform. From engine internals and ignition upgrades to suspension components and exterior accessories, everything here is matched to this chassis.
Wheels, tires, and suspension — the complete package for your build. From leveling kits to 12” lifts, paired with the wheels and tires to match. Every setup backed by guaranteed fitment.
See what other owners are running on their 1984 Chevrolet P20 – real fitment data from real trucks.
No scripts. No call centers. Our team builds and drives the same trucks you do — every recommendation comes from real-world experience. We’re not selling you a part, we’re helping you build your truck.
The Chevrolet P20 is the workhorse of the step-van world, a purpose-built commercial delivery platform that ran from 1975 through 1989 in both Delivery Van and Stripped Chassis configurations. Built on a dedicated forward-control chassis with rear-wheel drive, the P20 came in Base and Step-Van trims and was offered with a serious range of factory powerplants: a 4.8L inline-six, a 5.7L V8, a 6.2L diesel V8, and the big-block 7.4L V8. That engine variety is one of the reasons this platform has developed a loyal following among builders and restorers alike. The P20 chassis is straightforward and robust, making it a solid candidate for mechanical refreshes, drivetrain upgrades, and performance work. Whether you are keeping a working van on the road, restoring a classic step-van, or building something unique on the stripped chassis, the parts depth on this platform is real.
The factory suspension on the P20 is a heavy-duty commercial setup designed for load-carrying, not spirited driving. Refreshing worn components with new bushings, alignment and handling hardware, and replacement shocks brings the ride back to where it should be and tightens up the handling that decades of commercial use can erode. This is the right starting point for any P20 that has been working hard.
Stepping up means addressing the suspension with performance-oriented replacements: upgraded shock absorbers matched to the van's weight, stiffer bushings throughout the front and rear suspension, and steering components that restore precision. For a stripped chassis build or a van seeing regular loaded use, this level of attention pays off in stability and control.
A full overhaul addresses every wear point and upgrades the geometry hardware: complete bushing sets, new alignment and handling components, upgraded brake lines, and fresh driveline hardware to complement the suspension work. On a P20 that has covered serious miles or is being built for a specific purpose, this level of investment puts the chassis in better shape than it left the factory.
The P20's carbureted engines respond well to carburetor upgrades and ignition system improvements. Fresh spark plugs, upgraded coil packs, and a properly tuned carburetor wake up throttle response and smooth out the power delivery that years of service can dull. Air filter upgrades help the engine breathe more freely, which matters on a heavy platform where every bit of efficiency counts.
The 5.7L and 7.4L V8s in particular benefit from improved exhaust flow. Upgrading the muffler and mid-pipe sections reduces backpressure and lets the engine breathe more freely under load. The result is a more authoritative exhaust note and better pulling power when the van is loaded. The 6.2L diesel benefits from improved exhaust flow behind the factory emissions equipment, reducing backpressure and freeing up the engine to work more efficiently.
The P20 platform supports serious mechanical work: valve components, pistons and rods, camshafts, and full engine rebuilds are all well-supported for the 5.7L and 7.4L V8s. On the drivetrain side, ring and pinion gear sets, differential upgrades, clutch kits, flywheel and flex plate replacements, and torque converter swaps are all available for this chassis. For a van being put back to work or built for a specific duty, this depth of drivetrain support is the platform's real strength.
The P20's boxy, utilitarian body is a blank canvas for both functional improvements and appearance work, whether you are keeping a working van presentable or building something that stands out.
Body accessories for the P20 cover the practical side of van ownership: exterior body trim, protective accessories, and components that keep the van looking sharp after years of service. The step-van body style is distinctive, and sourcing the right exterior pieces for this platform requires parts matched to the P20's unique forward-control layout. Exterior hardware upgrades and body accessories help maintain the van's appearance and protect the body from the wear that commercial use brings.
Inside the P20, floor mats and liners are the practical foundation. The cargo area and cab of a working step-van take serious abuse, and quality floor protection keeps the interior serviceable. Whether the van is still on a route or has been converted for another purpose, protecting the floor surfaces is a straightforward upgrade that pays off in longevity.
Good: Replacement bushings and fresh shock absorbers to restore factory ride quality and handling. Better: Upgraded shocks, full bushing refresh, and alignment and handling hardware for improved stability under load. Best: Complete suspension overhaul with performance-grade components throughout, new brake lines, and geometry hardware for a chassis that handles better than stock.
Good: Fresh spark plugs, ignition upgrade, and air filter for improved throttle response and cleaner combustion. Better: Carburetor upgrade or rebuild, improved ignition system, and muffler and exhaust mid-pipe for better flow and a stronger pull under load. Best: Engine internals work (valve components, camshaft, pistons and rods), full exhaust system, and drivetrain upgrades including ring and pinion, clutch, and flywheel for a rebuilt, purpose-built powertrain; a supporting tune optimizes the full combination.
Good: Body trim accessories and protective exterior hardware to maintain the van's appearance. Better: Full exterior accessory package covering body protection, trim upgrades, and engine styling components visible under the hood. Best: Comprehensive exterior refresh with body accessories, engine bay detailing, and all available exterior hardware matched to the van's intended use.
Good: Quality floor mats and liners for the cab and cargo area. Better: Full floor liner coverage with added interior storage solutions. Best: Complete interior protection package with floor liners, storage organization, and any available interior trim upgrades for a clean, functional cabin.
Good: 16x6 +15 with 215/85R16 on stock suspension, matching the factory setup with a clean, period-correct stance. Better: 16x7 +15 with 225/85R16 on stock suspension, a modest step up in width for a slightly more planted look. Best: 20x8 -19 with 235/85R20 on refreshed suspension, the widest and tallest the verified fitment window supports for a more commanding presence.
Good: Reliable, road-ready, and maintained: a P20 that works as hard as it looks. Better: A refreshed, capable van with real mechanical improvements and a cleaner presence. Best: A purpose-built step-van with a rebuilt powertrain, sorted chassis, and a look that commands attention on the street or at a show.
It depends on what the van needs most. If the chassis has high miles, starting with suspension bushings and drivetrain components gets the foundation right before anything else. If the engine is tired, valve components, ignition, and carburetor work make an immediate difference. Builders focused on appearance start with exterior accessories. There is no single right order: start with the category that matters most to your build goals.
Yes. Get pre-approved before you start building your cart so you know your budget going in. Pre-approval is fast and lets you shop with confidence. Once you know what you are approved for, you can put together the right combination of parts without second-guessing the total. Financing options are available at checkout to spread the cost over time.
Absolutely. The P20 is a specialized platform and fitment questions come up, especially on the drivetrain and suspension side where commercial-duty specs differ from passenger vehicles. Our team can help confirm what fits your specific configuration, whether you are working with a Delivery Van or a Stripped Chassis build. Reach out before you order if you have questions about compatibility or install sequence.
We carry verified fitment parts for the P20 platform across engine, drivetrain, suspension, and exterior categories, not a generic catalog that may or may not apply to your chassis. Every part listed for this platform has been matched to the P20's specs. Combined with real customer support and financing options, we make it straightforward to get the right parts for a platform that most retailers overlook.
