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Roadster Shop has introduced the RS4 OBS, a complete custom chassis designed for 1988–1998 GM pickups. The reported starting price is $45,000, while selected options—including satin black powder coating—can push the total toward $60,000; the chassis is sold separately from the donor truck and its installation.
Roadster Shop has introduced the RS4 OBS, a complete custom chassis for 1988–1998 GM pickups, with a reported starting price of $45,000. The platform is intended to give owners a substantial foundation for a Chevrolet or GMC truck build, but engine, drivetrain and finish options can increase the price; the report describes builds reaching roughly $60,000.
The RS4 OBS uses 5-by-2.5-inch laser-cut frame rails with .188-inch wall thickness, according to The Drive’s report. Its suspension layout pairs Currie Dana 44 front and Dana 60 rear differentials with triangulated four-link suspension. Roadster Shop says the geometry is designed to optimize anti-dive, anti-squat and suspension articulation.
The chassis includes Fox Racing 2.5 Factory Race Series coilovers, with Roadster Shop tuning the valving in-house. The company also uses sealed X-axis flex joints rather than spherical or Johnny-style joints, describing them as a choice intended to improve noise, vibration and harshness behavior and service life. Front steering geometry is CAD-optimized, the report says.
Buyers can configure the chassis for different powertrains. It has factory mounting locations for 1988–1998 GMT400 trucks and can be specified with mounts for small- or big-block Chevrolet engines, LS engines, or LT1 and LT4 engines. An Atlas transfer case is available for four-wheel-drive builds. The Drive also lists disc-brake packages, stainless-steel brake lines and a Fox ATS steering stabilizer among the available choices. Satin black powder coating costs an additional $5,000, according to the report.
A High-Cost Foundation for GMT400 Builds
The RS4 OBS gives owners of older Chevrolet and GMC pickups an option beyond restoring or modifying the original frame. A complete replacement chassis can form the basis of a restomod or other extensively reworked truck, with suspension, steering, braking and powertrain provisions selected as part of the build. That scope may appeal to builders seeking a more integrated project, rather than sourcing and adapting each major component independently.
Price is a central part of the announcement. At $45,000 before options, the chassis alone can cost several times the roughly $15,000 donor-truck figure in the headline, before installation, an engine, transmission, bodywork or other build expenses. The reported $60,000 figure reflects a higher-option configuration, not a stated universal price. Buyers will need to compare the cost and scope of their planned build with retaining or modifying the factory frame.
The product also signals continuing demand for specialized parts for older GM trucks. Its range of engine mounts and optional four-wheel-drive equipment suggests Roadster Shop is targeting multiple build types, rather than a single fixed specification. The company’s claims about ride behavior and durability are design intentions; the supplied report does not provide independent testing results.
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The GMT400 Chassis and RS4 Options
GMT400 is the designation commonly used for GM’s 1988–1998 pickup generation, which includes Chevrolet and GMC models. The RS4 OBS is presented as a purpose-built replacement platform for those trucks, not as a complete vehicle. Buyers still need a compatible truck body and the other components required for a finished build.
The Drive places the RS4 alongside Roadster Shop’s broader work on custom chassis and restomod projects. The article reports that the new chassis starts at $45,000 and notes that the available configurations vary. Its example of a $5,000 satin black powder-coat option helps explain how a selected build could approach $60,000, though the report does not give a full price breakdown for every configuration.
“optimize anti-dive, anti-squat, and suspension articulation”
— Roadster Shop, as quoted on its website in The Drive’s report
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Final Build Costs and Tested Results
The reported figures do not establish a single price for every RS4 configuration. The exact total depends on selected components, and the supplied material does not provide a complete itemized list showing which options bring a build to $60,000. It also does not specify shipping, installation or other costs needed to complete a truck.
The report describes Roadster Shop’s engineering choices and intended benefits, but does not include independent testing, long-term durability data, or measured on-road and off-road performance. Availability, delivery timing, warranty terms and compatibility details for individual truck configurations are not stated in the source material.
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Confirming Options Before a Build
Prospective buyers will need to confirm current pricing, available configurations and delivery details directly with Roadster Shop. Before committing, builders should also check which engine mounts, brakes, transfer-case provisions and other options fit their intended truck and drivetrain.
The next practical step is a full build budget that includes the donor vehicle, chassis options, installation and remaining components. The announcement establishes the RS4’s target model years and starting price, but the supplied report does not identify a delivery schedule or announce independent test results.
Fox Racing coilover shocks for trucks
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Key Questions
What trucks is the RS4 OBS designed for?
Roadster Shop’s RS4 OBS is designed for 1988–1998 GM pickups, including Chevrolet and GMC trucks from that model generation.
How much does the custom chassis cost?
The Drive reports a $45,000 starting price. Options can raise the cost; satin black powder coating alone is listed at an additional $5,000. The reported $60,000 figure is not given as a fixed price for every configuration.
Does the price include a complete truck?
No. The RS4 OBS is a chassis assembly, not a finished pickup. The source describes the chassis and available components but does not state that a donor truck, installation or a complete drivetrain is included in the starting price.
Which engines can be fitted?
According to The Drive, the chassis can use the original-style 350 TBI V8 mounting locations or be configured with mounts for small- or big-block Chevrolet engines, LS engines, and LT1 or LT4 engines. Buyers should confirm fitment for their specific build with Roadster Shop.
Is the RS4’s performance independently verified?
The supplied report describes the chassis design and Roadster Shop’s stated aims for suspension behavior, but does not provide independent test results or long-term reliability data.
Source: rss
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