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Roadster Shop has introduced its RS4 OBS, a complete custom chassis designed for 1988–1998 Chevrolet and GMC pickups. The Drive reports a starting price of $45,000, with options that can bring the total to about $60,000; the package includes upgraded suspension and axle components, with multiple engine and drivetrain configurations available.
Roadster Shop has introduced the RS4 OBS, a complete custom chassis for 1988–1998 Chevrolet and GMC pickups, according to The Drive. The chassis starts at a reported $45,000, and additional options can bring the price to around $60,000, putting a substantial new-build component within reach of owners restoring or modifying these older trucks.
The RS4 OBS is sold as a complete chassis assembly rather than as a single suspension upgrade. The Drive reports that its foundation uses 5-by-2.5-inch laser-cut frame rails with 0.188-inch wall thickness. The front and rear use Currie Dana 44 and Dana 60 differentials, respectively, connected through triangulated four-link suspension layouts.
Roadster Shop says the suspension geometry is designed to optimize anti-dive, anti-squat and articulation. The package includes Fox Racing 2.5 Factory Race Series coilovers, with valving tuned in-house by Roadster Shop. Instead of spherical or Johnny-style joints, the company uses sealed X-axis flex joints; Roadster Shop presents those as a way to improve noise, vibration and harshness characteristics and service life. The chassis also uses front steering geometry optimized with computer-aided design.
The company offers factory mounting locations for 1988–1998 GM pickups and optional mounts for several Chevrolet engine families, including small-block and big-block engines, LS engines and LT1/LT4 engines. Buyers can also specify an Atlas transfer case for four-wheel-drive builds. Other listed options include disc-brake packages, stainless-steel brake lines, a Fox ATS steering stabilizer and satin-black powder coating, which The Drive says adds $5,000. The source reports a $45,000 starting price; the roughly $60,000 figure reflects a higher-option configuration, not a single stated base price.
A Costly New Route to GMT400 Builds
The RS4 OBS gives owners a route to replace or substantially rework the underlying platform of a truck that left the factory with decades-old chassis and suspension design. Its complete assembly, updated suspension and range of engine mounts could reduce the number of separate fabrication and parts decisions required for a high-end restoration or custom build.
The price is a major part of the story. At a reported $45,000 before options, the chassis can cost several times the value of an ordinary used GMT400 pickup; the headline’s $15,000 truck figure is a price comparison, not a confirmed average market value. The package therefore appears aimed at buyers investing heavily in a project, rather than owners seeking an inexpensive repair or routine upgrade. Whether the cost is justified will depend on a build’s intended use, final specification and the value the owner places on a purpose-built platform.
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Built for 1988–1998 GM Trucks
GMT400 is the platform designation associated with Chevrolet and GMC pickups from 1988 through 1998. These trucks can be used as the basis for restorations and custom builds, but a finished project may require work across the frame, suspension, brakes, steering and drivetrain. The RS4 OBS is designed to address those systems through one chassis assembly, while retaining factory mounting locations for the specified model years.
The Drive describes Roadster Shop as a maker of chassis used in high-end restomod projects, including builds based on classic American vehicles. That background provides context for the RS4 OBS’s intended market, but does not independently establish how the new chassis performs in road or off-road testing. The reported technical specifications and options describe the product; they are not a substitute for independent durability or performance results.
““optimize anti-dive, anti-squat, and suspension articulation.””
— Roadster Shop, as quoted on its website by The Drive
performance chassis for GM pickups
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Price, Testing and Delivery Details
The source report does not provide a complete price list, a detailed breakdown of how a particular build reaches $60,000, or the full cost of installation and related parts. Buyers would need to confirm which components are included in their selected configuration and whether the chassis requires additional work to suit a specific truck or powertrain.
The material also does not state production or delivery timing, warranty terms, independent test results, or how the package performs in real-world road and off-road use. Roadster Shop’s stated goals for suspension behavior and durability remain company claims in the cited report; no comparative test data is supplied.
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Buyers Must Confirm Their Build
Prospective customers will need to consult Roadster Shop for current pricing, availability, lead times and configuration details. The next practical step is matching the chassis to the pickup’s model year, engine, transmission, drivetrain and intended use, then confirming which brakes, steering components and other options are included in the quote.
As customer builds are completed, independent road tests and documented installation experience could provide more evidence about fit, handling and reliability. Until that information is available, the announced specifications and company descriptions are the clearest details in the source report.
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Key Questions
What is the Roadster Shop RS4 OBS?
It is a complete custom chassis designed for Chevrolet and GMC pickups from the 1988–1998 model years.
How much does the chassis cost?
The Drive reports a $45,000 starting price. Options can raise the total to around $60,000, but the source does not list a complete price breakdown for each configuration.
What suspension and axle parts are included?
The reported package includes Currie Dana 44 front and Dana 60 rear differentials, triangulated four-link layouts and Fox Racing 2.5 Factory Race Series coilovers. Roadster Shop says it tunes the coilover valving in-house.
Can the RS4 OBS use different engines?
Roadster Shop offers factory mounting locations for the covered GM pickups and optional mounts for small-block and big-block Chevrolets, LS engines and LT1/LT4 engines, according to The Drive.
Are delivery dates and independent performance results available?
The source report does not give production or delivery timing or cite independent road or off-road test results. Buyers should confirm current availability and specifications directly with Roadster Shop.
Source: rss
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