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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 options described in The Drive’s report can raise the price to about $60,000; the report compares that cost with roughly $15,000 trucks, but does not establish a typical purchase price for those pickups.
Roadster Shop has introduced the RS4 OBS, a complete replacement chassis for 1988–1998 Chevrolet and GMC pickups, with a starting price of $45,000. Options can bring the reported price to about $60,000, making the new platform a substantial investment for owners planning a restomod or performance-focused truck build.
The RS4 OBS is supplied as a complete chassis rather than a collection of individual suspension upgrades, according to The Drive’s report. Its frame uses 5-by-2.5-inch rails with 0.188-inch-thick walls. The setup includes a Currie Dana 44 front differential and Dana 60 rear differential, with both mounted using triangulated four-link suspension. Roadster Shop says the geometry is intended to manage anti-dive, anti-squat and suspension articulation.
The chassis comes with Fox Racing 2.5 Factory Race Series coilovers, with valving tuned in-house by Roadster Shop. It also uses sealed X-axis flex joints in place of spherical or Johnny-style joints. The company says those joints are intended to improve noise, vibration and harshness characteristics and durability. The report also identifies CAD-optimized front steering geometry as part of the design.
Roadster Shop offers multiple drivetrain and equipment choices. The chassis retains factory mounting locations for 1988–1998 GMT400 trucks and can be configured with mounts for small- or big-block Chevrolet engines, LS engines, or LT1 and LT4 engines. An Atlas transfer case is available as an option for four-wheel-drive builds. Other choices include disc-brake packages, stainless-steel brake lines, a Fox ATS steering stabilizer, and satin-black powder coating, which the report prices at an additional $5,000.
A Costly Foundation for GMT400 Builds
The RS4 OBS offers GMT400 owners a route to replace the original truck’s chassis and suspension with a purpose-built platform, rather than assembling a comparable setup from separate parts. That could appeal to builders seeking more modern suspension components, engine flexibility or a starting point for a heavily modified truck. The company’s stated goals for the suspension and joint design are product claims; the supplied report does not provide independent test results or comparative performance measurements.
Price is central to the announcement. The $45,000 starting figure is three times the approximately $15,000 pickup price referenced in the story’s headline, before options or installation. That comparison illustrates the scale of the investment, but it is not a verified market-wide price for GMT400 trucks. Buyers would also need to account for the vehicle, drivetrain, assembly and any other project costs not included in the chassis price.
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Designed Around 1988–1998 GM Trucks
GMT400 is the truck platform used in Chevrolet and GMC pickups from 1988 through 1998. Roadster Shop’s new chassis is aimed at owners who want to build on one of those trucks while changing its underlying structure and suspension. The report notes that the platform can accommodate an original 350 TBI V8 as well as several newer Chevrolet engine families, depending on the mounts selected.
Roadster Shop is known for chassis used in custom and restomod builds, including high-powered projects, according to The Drive. The RS4 OBS extends that kind of offering to this generation of GM pickup. The report gives a $45,000 base price and describes options that may lift a configured build to around $60,000; it does not provide a full itemized price list for every configuration.
“optimize anti-dive, anti-squat, and suspension articulation.”
— Roadster Shop, as quoted on its website in The Drive’s report
performance chassis for 1988-1998 GM trucks
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Pricing and Performance Details
The supplied report does not specify a release or shipping date, installation requirements, or the exact parts included in the $45,000 base configuration. It also does not provide a complete option-by-option breakdown explaining how a build reaches about $60,000. Roadster Shop’s stated durability and handling aims are not accompanied in the report by independent test data, warranty details or long-term owner results.
The roughly $15,000 figure in the headline is not supported with a market survey or a defined condition, location or purchase period for the trucks. It should be read as a price comparison used in the story, not as a confirmed average for GMT400 pickups. The cost of installation and completing a vehicle build is also not established.
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Buyer Details to Watch
Prospective buyers will need to consult Roadster Shop for current availability, the full configuration list and a written quote for their chosen drivetrain and equipment. The next practical details to confirm include what the base package contains, whether the chassis is supplied ready for installation, and which additional parts or labor a specific truck will require. Until those details are published or confirmed, the reported prices describe the chassis offering rather than the total cost of a completed pickup.
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Key Questions
What is the RS4 OBS?
It is a complete replacement chassis from Roadster Shop designed for 1988–1998 Chevrolet and GMC pickups.
How much does the chassis cost?
The reported starting price is $45,000. Options can bring the price to about $60,000, but the supplied report does not include a complete itemized price list.
What engines can be fitted?
Roadster Shop lists mounts for the original GMT400 setup and options for small- or big-block Chevrolet engines, LS engines, and LT1 or LT4 engines. Buyers should confirm compatibility for their specific build.
Does the RS4 OBS include four-wheel-drive equipment?
An Atlas transfer case can be added for a four-wheel-drive build, according to The Drive’s report. It is described as an option, not standard equipment.
Is the $60,000 price the total cost of a finished truck?
No. The report describes a chassis configuration that can cost about $60,000; it does not establish the total price of a completed pickup, including the vehicle, installation and other build components.
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