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Roadster Shop has revealed the RS4 OBS, a new complete chassis designed for 1988–1998 GM pickups, including Chevrolet GMT400 trucks. The chassis starts at $45,000 before options; The Drive reports builds can reach about $60,000. Equipment includes Dana axles, Fox coilovers and a range of engine and brake options.
Roadster Shop has introduced the RS4 OBS, a complete replacement chassis for 1988–1998 GM pickups, including Chevrolet GMT400 models, with a starting price of $45,000. Options can push the reported cost to about $60,000, making the new platform a high-cost foundation for owners planning performance-focused truck builds.
The RS4 OBS is a newly built chassis assembly, rather than a collection of parts intended to upgrade a factory frame. The Drive reports it uses 5-by-2.5-inch laser-cut frame rails with 0.188-inch-thick walls. Roadster Shop lists Currie Dana 44 front and Dana 60 rear differentials, with the suspension arranged around triangulated four-links.
The suspension package includes Fox Racing 2.5 Factory Race Series coilovers, with valving Roadster Shop says it tunes in-house for on- and off-road use. The company also describes its suspension connections as sealed X-axis flex joints, and says the four-link layout is intended to manage anti-dive, anti-squat and articulation. Those are manufacturer descriptions; independent test results are not included in the source report.
Buyers can configure the chassis for different engines, with factory mounting locations for 1988–1998 GM pickups and additional mount kits for small- and big-block Chevrolet engines, LS engines, and LT1 or LT4 powertrains. An Atlas transfer case is available as an option for four-wheel-drive builds. Roadster Shop also offers disc-brake packages, stainless-steel brake lines and a Fox ATS steering stabilizer kit. The Drive reports that satin-black powder coating adds $5,000.
A Costly Foundation for GMT400 Builds
The RS4 OBS gives builders a new route to substantially rework an older GM pickup without relying solely on its original chassis and suspension layout. A complete platform with suspension, axles and engine-mount choices may help organize a complex restomod project, particularly for owners targeting a mix of road handling and off-road capability.
The price is central to the announcement. At $45,000 before options, the chassis alone can cost several times the roughly $15,000 truck price referenced in the headline. The Drive says optioned builds can reach around $60,000. That is before the cost of a donor truck, engine, transmission, bodywork, labor and other project parts, so the package is aimed at buyers prepared for a major build budget rather than a low-cost upgrade.
Roadster Shop’s claims about geometry, articulation, durability and noise performance describe the intended design benefits. The source material does not provide independent comparisons with a factory GMT400 chassis or measured performance data, so buyers would need more information to judge how those claims translate to a finished truck.
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Designed for 1988–1998 GM Trucks
The chassis is built for the generation of GM full-size pickups sold from 1988 through 1998, commonly referred to as GMT400 trucks. That range includes Chevrolet and GMC pickups, and the RS4 OBS name identifies the product as a platform for older-style pickups. Roadster Shop’s stated goal is to supply a complete base for a new build, rather than an isolated suspension component.
Roadster Shop has also supplied chassis for other performance-oriented restomods, according to The Drive, including high-powered Chevrolet truck projects. That history is relevant to the RS4 OBS’s positioning, but it does not establish the new chassis’s real-world performance or reliability. The specific equipment and cost will depend on the configuration selected by each buyer.
““optimize anti-dive, anti-squat, and suspension articulation.””
— Roadster Shop, as quoted on its website by The Drive
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Pricing and Performance Details
The source gives a $45,000 starting price and reports that options can bring the total to about $60,000, but it does not provide a complete price list or explain which configuration corresponds to that upper figure. The exact cost will depend on selected equipment, and buyers should confirm current pricing and availability directly with Roadster Shop.
The report does not state delivery timelines, production capacity, warranty terms or whether installation is included. It also supplies no independent road or off-road test results, durability data, or direct comparison with a stock GMT400 chassis. Roadster Shop’s descriptions of the design and its intended benefits remain company claims unless supported by further testing.
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Buyers Must Confirm Build Specifications
The next step for prospective customers is to compare available configurations and get a current quote from Roadster Shop, including the cost of options such as powder coating, brakes, engine mounts and a transfer case. Buyers will also need to account for installation and the remaining parts and labor required to complete a truck.
No delivery schedule or independent evaluation is included in the source report. Further details on availability, warranty coverage and testing would help clarify how the RS4 OBS performs beyond its stated specifications.
Fox coilover suspension kit for trucks
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Key Questions
What is the Roadster Shop RS4 OBS?
It is a complete replacement chassis designed for 1988–1998 GM pickups, including Chevrolet GMT400 trucks.
How much does the RS4 OBS cost?
The reported starting price is $45,000. The Drive says options can bring the cost to about $60,000; the final price depends on the selected configuration.
What suspension and axle equipment does it use?
The reported specifications include Currie Dana 44 front and Dana 60 rear differentials, triangulated four-links and Fox Racing 2.5 Factory Race Series coilovers.
Can buyers choose an engine or four-wheel-drive setup?
Roadster Shop offers engine-mount options for several Chevrolet engine families, including small- and big-block engines and LS, LT1 and LT4 applications. An Atlas transfer case is available for four-wheel-drive builds.
Are performance claims independently verified?
The source report does not include independent testing or measured comparisons. Claims about suspension behavior and intended noise, vibration and harshness benefits are attributed to Roadster Shop.
Source: rss
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