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Roadster Shop has introduced the RS4 OBS, a complete replacement chassis designed for 1988–1998 Chevrolet and GMC pickups. The chassis starts at $45,000, while the source report says options can bring the price to about $60,000; the report does not provide a full option-by-option price breakdown.
Roadster Shop has introduced the RS4 OBS, a complete performance chassis for 1988–1998 Chevrolet and GMC pickups, with prices starting at $45,000. The new platform is aimed at owners building or restoring GMT400 trucks, and optional equipment can bring the reported cost to about $60,000—well above the roughly $15,000 truck price referenced in The Drive’s headline.
The RS4 OBS is sold as a new, complete chassis assembly, rather than as an individual suspension upgrade. According to The Drive’s report, it uses 5-by-2.5-inch frame rails with .188-inch-thick walls, plus Currie Dana 44 front and Dana 60 rear differentials. Triangulated four-link suspension is intended to manage suspension movement and vehicle dynamics.
Roadster Shop equips the chassis with Fox Racing 2.5 Factory Race Series coilovers, with valving tuned in-house, the company says. Its product description also specifies sealed X-axis flex joints instead of spherical or Johnny-style joints. Roadster Shop says those joints are intended to improve noise, vibration and harshness characteristics and durability; those are manufacturer claims, not independently verified performance results in the source report.
The chassis retains factory mounting locations for GMT400 trucks and can be configured for several engine families, including small- and big-block Chevrolet engines, LS engines and LT1/LT4 engines, according to the report. An Atlas transfer case is available for four-wheel-drive builds. Other options include disc-brake packages, a Fox ATS steering stabilizer kit and satin-black powder coating, listed at an additional $5,000.
A Major Investment in GMT400 Builds
The RS4 OBS offers GMT400 owners a route to replace or substantially upgrade a truck’s underlying platform as part of a restomod or custom build. A complete chassis can bring frame, suspension and steering components together in one assembly, while engine and drivetrain choices let builders plan around different powertrains. The Drive describes the design as a head start for a project, but does not provide a build-time comparison or independent test data.
The price changes the calculation. At $45,000 before options, the chassis alone costs several times the approximately $15,000 pickup price cited in the headline. A build would also require a suitable truck body and other parts and labor. The product is therefore aimed at buyers prioritizing a highly customized project, not at a straightforward, low-cost repair or restoration.
Chevrolet GMT400 chassis replacement
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Built for 1988–1998 GM Trucks
GMT400 is the platform designation for 1988–1998 GM pickups, which includes Chevrolet and GMC models. The RS4 OBS is intended specifically for that generation. Roadster Shop has also produced chassis for other custom vehicles; The Drive points to its platforms in high-end restomods and a modified Squarebody Chevrolet pickup as examples of the company’s work.
The RS4 OBS’s fitment and engine options matter because custom builds can vary widely. The report says the chassis supports original-style 350 TBI V8 mounting as well as other Chevrolet engine configurations. It also describes the transfer-case option and brake packages, but does not list every configuration or explain whether all combinations are compatible.
““optimize anti-dive, anti-squat, and suspension articulation.””
— Roadster Shop, as quoted in The Drive’s report
custom truck chassis for GM pickups
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Pricing and Performance Details
The Drive reports a $45,000 starting price and says the cost can reach $60,000 depending on selected options. The source material does not give a complete price list or specify which exact configuration totals $60,000. It also does not establish whether that figure includes installation, taxes, shipping or any components beyond the chassis options discussed.
No independent road test, durability assessment or measured handling results are included in the report. Roadster Shop’s descriptions of suspension behavior, ride characteristics and joint longevity remain manufacturer claims in the available material. Availability, delivery timing, warranty terms and the precise installation requirements are also not stated.
performance chassis for 1988-1998 GM trucks
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Buyers Must Confirm Build Specifications
Prospective buyers will need to confirm current pricing, availability and lead times directly with Roadster Shop. They should also verify which engine mounts, brakes, transfer case and other options suit their truck and intended use, and whether installation is included in any quoted price. The available report does not name a delivery schedule or a next public product milestone.
For anyone considering a full build, the practical next step is to compare the chassis specification with the condition of the truck and the complete project budget. The RS4 OBS announcement establishes the product and its starting price; final costs and real-world performance depend on the chosen configuration and build.
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Key Questions
What is the Roadster Shop RS4 OBS?
It is a complete replacement chassis designed for 1988–1998 Chevrolet and GMC pickups, also known as GMT400 trucks.
How much does the chassis cost?
The reported starting price is $45,000. The Drive says options can bring the total to about $60,000, but the available report does not provide a complete option-price breakdown.
Which engines can the RS4 OBS accommodate?
The report lists factory-style GMT400 mounting locations and options for small- and big-block Chevrolet engines, LS engines and LT1/LT4 engines. Buyers should confirm exact compatibility with Roadster Shop.
Can the chassis be used for a four-wheel-drive build?
According to The Drive, an Atlas transfer case can be specified for a 4×4 build. The report does not detail every compatible drivetrain configuration.
Does the reported price include installation?
The source material does not say whether installation, shipping, taxes or other build costs are included. Buyers should request a detailed quote before committing.
Source: rss
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