Custom Offsets carries wheels and tires, suspension, performance parts, and accessories for the 1984 Chevrolet G20, with verified fitment across every trim and body style this generation offered.
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 G20 – 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 third-generation Chevrolet G-series van ran from 1971 through 1996, and the G20 three-quarter-ton variant sat at the heart of that lineup for two decades. Introduced with a front-engine layout and independent front suspension with coil springs, it was a genuine departure from the forward-control vans that came before it. The G20 came in standard and extended wheelbases, as a cargo van or a passenger van, and wore trim names like Beauville, Sportvan, Bonaventure, and Nomad across its run. Engine options ranged from the 4.1L inline-six and 4.3L V6 through 5.0L and 5.7L V8s, a 7.4L big-block, and even 6.2L and 6.5L diesel V8s. The 4.3L V6 replaced the inline-six as the standard engine in 1985, and throttle-body fuel injection arrived for 1987. Four-wheel anti-lock braking became standard for 1993. That long production run, shared powertrain DNA with the C/K pickup trucks, and a massive aftermarket parts base make this van a serious platform for builders who want something different.
The G20 runs a 5x5 bolt pattern and a 77.80mm hub bore, shared with a wide range of Jeep and Chrysler platforms, which means aftermarket wheel selection is broad. Factory wheels were 15-inch units across most trims, with offsets around +11, and tires in the 225/75R15 to 235/60R15 range depending on trim.
The G20's independent front suspension with coil springs and solid rear leaf-spring axle gives a workable baseline for builders who want to keep the ride height close to factory. At stock height, the verified fitment window supports 15- to 20-inch wheels, widths from 7 to 8.5 inches, and offsets from a conservative +15 down to -19. Tire sizes up to about 30 inches fit without modification. A documented build from our community runs a 16x8 +0 wheel up front on 26x10.50R16 tires at stock height, a setup that shows what the platform can do without touching the suspension.
The G20's front suspension geometry responds well to upgraded components: replacement control arm bushings, alignment and handling hardware, and steering components that tighten up decades of wear. The rear leaf-spring setup benefits from replacement shocks and spring components, and air suspension load-support hardware is available for the rear when payload or ride leveling is the goal. Addressing worn bushings and steering components is the foundation for any wheel and tire upgrade on a van this age.
For builders who want adjustable ride height or improved load management, rear air suspension load-support systems are a direct fit on the G20's leaf-spring rear axle. These systems let you dial in ride height under varying load conditions, useful for a passenger van that sees varying occupancy or a cargo van that carries variable weight. Combined with refreshed front suspension components, a properly sorted G20 rides and handles with a confidence that the stock worn-out setup rarely delivers.
The G20's engine lineup spans carbureted inline-sixes and V8s through throttle-body-injected V6s and V8s, so the right intake approach depends on the era. For carbureted engines, carburetor upgrades and intake manifold work improve throttle response and airflow. For the TBI-equipped 4.3L V6 and V8s from 1987 onward, aftermarket air filters and intake accessories improve induction breathing. Throttle body upgrades are available for the TBI engines and sharpen response. Ignition upgrades, coil packs, and spark plug changes are straightforward bolt-ons across the whole engine range and are often the first move on a high-mileage van.
The G20's V8s, particularly the 5.0L, 5.7L, and 7.4L big-block, respond well to exhaust work. Aftermarket headers improve exhaust flow out of the heads, and mid-pipe and muffler upgrades carry that flow through the system. The result is a deeper, more authoritative exhaust note and freer breathing across the RPM range. The 4.3L V6 benefits from the same approach on a smaller scale, with a noticeable improvement in throttle response and sound. Muffler options range from a mild tone to something more aggressive, depending on how loud you want the van to announce itself.
The G20 shares its drivetrain architecture with the C/K pickup trucks, which means a deep catalog of drivetrain parts: ring and pinion gear sets, differential components, axle hardware, clutch kits, flywheel and flex plate options, and torque converters for the automatic-equipped vans. For builders going deeper, engine internals including pistons, rods, camshafts, and valve components are well-supported across the 5.0L, 5.7L, and 7.4L V8 families. Oil system upgrades and cooling components round out the engine build. This is a platform with genuine hot-rod potential if you want to go there.
The G20's boxy, upright body is a blank canvas for builders who want to give it real presence, and the right lighting and exterior work transforms it from a plain work van into something that gets noticed.
Headlight upgrades are the most impactful first move on a van this age: modern LED or projector-style headlight assemblies replace the dated sealed-beam units and dramatically improve both output and appearance. Bulb upgrades throughout the van, including marker lights and interior lighting, are straightforward and make a real difference on a vehicle with 1970s-era lighting. For builders who want more presence at night, accent lighting and light wiring kits open up options for exterior accent work. The G20's flat body panels and wide roof also make it a natural candidate for auxiliary lighting if the build calls for it.
On the exterior, body accessories and windshield options are available for this generation. A tow hitch and towing accessories are a direct fit for the G20's frame, useful for a van that already has the torque to pull a trailer. For the interior, floor carpet and rear floor mat options are available and make a real difference in a van that has seen decades of use. Seat protection and interior storage organization suit both the cargo and passenger van configurations. The G20's interior is large enough that a thoughtful interior build, whether for a daily driver, a conversion van project, or a work vehicle, has real room to work with.
Good: Replacement shocks, control arm bushings, and alignment hardware to restore factory geometry and eliminate decades of wear. Better: Upgraded front suspension components with refreshed steering hardware and rear shock replacement for a sorted, confidence-inspiring ride. Best: Full suspension refresh front and rear with air suspension load-support hardware in the rear, upgraded bushings throughout, and geometry-correction hardware for a van that rides and handles like it should.
Good: Spark plug replacement, ignition upgrade, and an air filter swap for a clean, responsive baseline on any engine in the lineup. Better: Intake manifold or throttle body upgrade paired with a muffler or mid-pipe exhaust change for improved breathing and a stronger exhaust note across the V6 and V8 options. Best: Aftermarket headers, a full exhaust system, carburetor or fuel system upgrade, and supporting drivetrain work including differential and ring and pinion upgrades; a supporting ECU calibration gets the most out of the combination on fuel-injected engines.
Good: Headlight upgrades to modern LED or projector units, bulb replacements throughout, and a tow hitch for utility. Better: Body accessories, windshield upgrades, and exterior accent lighting for a van that looks intentional rather than stock. Best: Full exterior package with upgraded lighting throughout, body accessories, towing hardware, and accent lighting that gives the G20 real presence day or night.
Good: Floor carpet replacement and rear floor mat liners to protect and refresh a well-used interior. Better: Full floor liner coverage front and rear, interior lighting upgrades, and storage organization for a cleaner, more functional cabin. Best: Complete interior refresh with floor protection, lighting, storage solutions, and seat protection across all rows, whether the van is configured for cargo or passengers.
Good: 16x8 +0 with 26x10.50R16 tires on stock suspension, a documented setup from our community that fits without modification and gives the van a purposeful stance. Better: 17- to 18-inch wheels in the -12 to +15 offset range with 235/75R17 or similar tires, stepping up from the factory 15-inch setup for a more modern look while staying within the verified fitment window. Best: 20-inch wheels at a mild negative offset with tires up to 30 inches in diameter, pushing the fitment window to its outer edge for a van that rolls with real presence.
Good: A sorted, reliable daily driver or work van with refreshed mechanicals and a clean, purposeful look. Better: A van with real personality: upgraded mechanicals, intentional exterior presence, and a cabin that reflects the build. Best: A full custom build, whether a show van, a conversion project, or a high-output work vehicle, built to be noticed and built to last.
It depends on your goal. If the van has high miles, a mechanical refresh, suspension bushings, ignition, and exhaust, gives you a reliable foundation before you spend money on appearance. If presence is the priority, wheels and tires paired with headlight upgrades make an immediate visual impact. Performance builders often start with intake and exhaust work. There is no single right order: start where your build needs it most.
Yes. Get pre-approved before you build your cart so you know your budget going in. Pre-approval is fast and does not require a purchase to complete. Once you know what you are working with, you can put together the right combination of parts without guessing. Financing lets you do the full build now and pay over time rather than piecing it together slowly.
Our fitment team knows this platform. For fitment, we verify wheel and tire combinations against the G20's bolt pattern, hub bore, and offset range so you are not guessing at clearance. For install questions, we can help with sequencing, what hardware you need, and what to watch for on a van this age. Real support from people who have seen these builds, not a generic FAQ.
We are a fitment-first retailer. Every part in our catalog is matched to this specific platform, and our community of real builds gives you proof of what actually works on a G20, not just what the catalog says fits. We carry performance, suspension, exterior, interior, and wheel and tire packages under one roof, with a team that can answer real questions about building this van the right way.
