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Triumph GT6 Chassis

The Triumph GT6 chassis is a backbone-style structure shared in principle with the Herald and Vitesse, though the GT6's longer wheelbase and fixed-head body bring their own specific repair requirements. Sill sections, floor panels, outriggers and A-post repairs are the most common restoration needs on cars built between 1966 and 1973, and model-year differences mean some sections aren't interchangeable across marks.

Rimmer Bros has supplied GT6 chassis parts from Lincoln, UK, since 1982. Whether you're patching a sill on a Mk1 project or doing a full bodyshell restoration on a late Mk3, you'll find the repair sections and structural components you need here. Work through the related categories too; our Triumph GT6 Body Parts & Fittings and Triumph GT6 Brake System pages cover the panels and mechanical components that typically need attention at the same time.

For a complete rolling restoration, also see Triumph GT6 Suspension, Triumph GT6 Steering and Triumph GT6 Engine Components.

Not sure what you need? Call our team on 01522 568000 for model-specific guidance.

Tackling a GT6 chassis restoration? Browse the full range below or call our parts advisors for section-by-section help.

Triumph GT6 Chassis

Triumph GT6 Chassis Frame

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Frequently Asked Questions

Is the Triumph GT6 chassis the same as the Spitfire?

It is not. The GT6 uses a backbone chassis design related to the Triumph Herald and Vitesse family, not the Spitfire. The GT6's longer wheelbase and fixed-head coupe body mean specific repair sections apply. Always confirm the mark and chassis number before ordering, as some panels differ between Mk1, Mk2 and Mk3 cars.

Are GT6 chassis repair sections still available?

Yes, GT6 chassis repair sections are still available. Rimmer Bros, established in 1982 and based in Lincoln, UK, stocks sills, floor panels, outriggers and structural repair sections for the full GT6 production run. Many are manufactured from original or equivalent tooling. Browse our Triumph GT6 Body Parts & Fittings for related panel work.

Can I use Herald chassis sections on a GT6?

No, not without careful checking. The GT6 shares its backbone chassis concept with the Herald but has a longer wheelbase of 83 inches against the Herald's 91 inches, and the fixed-head structure adds unique load paths. Some repair sections are specific to the GT6 and are not transferable from Herald stock. Confirm fitment before ordering.

Will a chassis inspection reveal all structural issues on a GT6?

A visual inspection is a good starting point, but is not the full picture. GT6 chassis corrosion is common in sill sections, floor outriggers and around the A-post base, and some rot is hidden beneath trim or underseal. A thorough inspection with a prodding tool and, where needed, removal of carpets is the reliable way to assess the full extent of repairs needed.