Roadster Shop Reveals $60,000 Custom Chassis For $15,000 Chevy GMT400 Pickups

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Roadster Shop has introduced the RS4 OBS, a complete aftermarket chassis designed for 1988–1998 Chevrolet and GMC pickups. It starts at $45,000, while selected options—including $5,000 satin-black powder coating—can bring the price to about $60,000. The chassis specifications and options are described in The Drive’s report, but a final configured price and delivery details are not provided.

Roadster Shop has revealed the RS4 OBS, a complete custom chassis for 1988–1998 Chevrolet and GMC pickups, priced from $45,000 before options. The package targets owners building or substantially modifying these trucks, whose purchase prices may be far below the chassis cost; The Drive reported that optioned versions can reach about $60,000.

The RS4 OBS is presented as a new, complete chassis rather than a collection of individual suspension parts. According to The Drive’s report, its structure uses 5-by-2.5-inch frame rails with 0.188-inch wall thickness. The suspension pairs a Currie Dana 44 front differential and Dana 60 rear differential with triangulated four-link setups. Roadster Shop says the geometry is intended to optimize anti-dive, anti-squat and suspension articulation.

The chassis includes Fox Racing 2.5 Factory Race Series coilovers, with valving tuned in-house by Roadster Shop for a balance between on-road and off-road use. The company also specifies sealed X-axis flex joints instead of spherical or Johnny-style joints, describing them as a choice intended to improve noise, vibration and harshness characteristics and durability. The front steering geometry is described as CAD-optimized.

Roadster Shop offers engine-mount options for a range of Chevrolet powertrains, including small-block and big-block engines and LS, LT1 and LT4 motors; factory mounting locations for 1988–1998 GMT400 trucks are standard, the report says. An Atlas transfer case is available for 4×4 builds. Other choices include disc-brake packages, stainless-steel brake lines and a Fox ATS steering stabilizer kit. The Drive notes that satin-black powder coating costs an additional $5,000; it does not provide a complete option-by-option price list.

A Major Investment in GMT400 Builds

The announcement gives GMT400 owners a route to replace or substantially upgrade the original truck platform as part of a high-end restomod or custom build. A complete chassis can consolidate structural, suspension and drivetrain-mounting choices into one package, though how much work it saves will depend on the vehicle, selected configuration and installer.

The price makes the intended audience clear: this is a major project component, not a modest repair or inexpensive bolt-on upgrade. The source headline compares the chassis with pickups around $15,000, but that figure is not established as a typical market price for all GMT400s. At the reported starting price, the chassis alone costs several times that illustrative truck figure; the full build would also require a donor vehicle, powertrain and other parts, along with labor. Buyers will need to weigh those costs against the goals and condition of their project.

Designed for 1988–1998 GM Trucks

The GMT400 is the Chevrolet and GMC pickup platform produced for the 1988–1998 model years. Roadster Shop’s RS4 OBS is tailored to that generation, with standard factory mounting locations for those trucks and additional mount choices intended to accommodate different Chevrolet engines. The design therefore speaks to owners seeking to retain the era’s body and appearance while changing the underlying chassis and mechanical setup.

The Drive describes Roadster Shop as a builder of chassis used in restomod projects, including high-powered classic vehicles. Its report characterizes the RS4 OBS as a purpose-built, complete platform and outlines the hardware and options, but does not independently test the chassis or provide comparative performance measurements. Claims about handling, durability and ride characteristics should be understood as design aims or company descriptions, not demonstrated results in the supplied material.

“optimize anti-dive, anti-squat, and suspension articulation”

— Roadster Shop, as quoted on its website by The Drive

Final Pricing and Delivery Details

The supplied report does not include a full price breakdown, identify which parts are included in the $45,000 starting configuration, or specify the exact combination of options needed to reach roughly $60,000. It also does not give order availability, production volume, lead times, warranty terms or installation requirements. The reported $60,000 figure should be treated as an approximate optioned price, not a confirmed universal price for every build.

Performance claims have not been backed by test results in the source material. It is not clear how the chassis will ride or handle in specific configurations, how much fabrication or modification a given truck will need, or what the completed project will cost. Roadster Shop’s descriptions explain the intended design benefits, but real-world results will depend on setup, components and use.

Buyers Need Configuration Details

Interested owners will need to consult Roadster Shop for current availability, a written quote and a complete list of included and optional components. A build plan should establish the truck’s intended use, engine and transmission, two- or four-wheel-drive requirements, braking setup and installation arrangements before the chassis is ordered.

The next useful information for buyers would be confirmed pricing by configuration, delivery schedules, warranty coverage and fitment guidance. Until those details are available in the source material, the announcement establishes the product’s broad specification and starting price, but not the total cost or timeline for completing a GMT400 project.

Key Questions

What is the Roadster Shop RS4 OBS?

It is a complete aftermarket chassis designed for 1988–1998 Chevrolet and GMC GMT400 pickups, with upgraded frame rails, suspension and available drivetrain and brake options.

How much does the chassis cost?

The reported starting price is $45,000. Selected options can bring a configuration to about $60,000, according to The Drive; a full option-by-option price list is not included in the source.

What engines can be fitted?

The report lists mounting options for Chevrolet small-block and big-block engines and LS, LT1 and LT4 motors. Factory mounting locations for 1988–1998 GMT400 trucks are standard.

Is the RS4 OBS intended for four-wheel-drive trucks?

Roadster Shop offers an Atlas transfer case option for 4×4 builds, according to The Drive. The report does not provide full configuration details or pricing for that setup.

When will the chassis be available?

The supplied report does not state an order date, production schedule or delivery lead time. Buyers will need to ask Roadster Shop for current availability.

Source: rss