1969 Buick GS400 Stage 1 Convertible

Description

Launched in 1964, the Gran Sport (GS) was Buick’s answer to the newly released Pontiac GTO. First offered through Buick's in-dealer parts department as a series of over-the-counter components or installed directly via the adjacent service department, the high-performance Stage 1 package was a massive upgrade to the already formidable GS 400, upholding Buick’s “Fast with Class” reputation.

Featuring a repaint in red during a cosmetic refurbishment completed in 2020, this GS400 convertible was first delivered to Mann Buick of Adrian, Michigan, and optioned from the factory with both Stage 1 Equipment and Rallye Road Control packages. Amenities include power-assisted brakes and steering, power-adjustable driver’s seat, power windows, and air conditioning.

One of just 131 Stage 1 GS400 convertibles produced in 1969, this example reportedly received a replacement frame, rear quarter panels, floor pans, and trunk pan during the 2020 refurbishment, and servicing said to have been completed is highlighted below.

This 1969 Buick GS400 Stage 1 Convertible is now offered with multiple keys, service books, owner’s manuals, a reproduction window sticker, and a clean Arizona title in the seller’s name.

Highlights

• One of just 131 Stage One GS 400 convertibles produced in 1969

• Factory equipped with the Stage 1 Equipment and Rallye Road Control packages

• Reported frame replacement and cosmetic refurbishment in 2020

• Finished in red paint with white vinyl bucket interior

• Power-operated white convertible soft top

• Power-assisted brakes, power steering, and air conditioning

Factory Equipment

• Carbureted 400ci V8 engine

• TH400 three-speed automatic transmission

• Power-assisted four-wheel drum brakes

• Power steering

• 14” Super Sport wheels

• Functional hood scoops

• Power adjustable driver’s seat

• Full length center console

• Rallye steering wheel

• Power windows

• Air conditioning

• Stage 1 Equipment Package

  • High performance engine variant

  • Specific ornamentation

  • Posi-Traction rear axle

  • Heavy-duty cooling

  • Low restriction exhaust system

Modifications

• Frame, rear quarter panels, floor pans, and trunk pans reportedly replaced during the 2020 refurbishment

• Doug’s exhaust headers and 2.5” exhaust system

• Pertronix electric ignition conversion

Servicing & Documentation

The following servicing is said to have been completed:

• 2022: Oil pump, timing cover, timing gear, belts, water pump, fuel pump, and transmission pant gasket replaced

• 2020: Reported metal work, frame replacement, and cosmetic refurbishment

• 2020: Brake lines, fuel lines, fuel pump, steering gear and lines, and transmission pan gasket

• 2018: Shocks, springs, and various suspension components replaced

Known Imperfections

• BFGoodrich Radial T/A tires with 2013 date codes

• Discolored carpet

• From the seller:

  • "The paint bubbling on the front fenders was repaired a couple of years ago. There is filler in the area."

  • “Paint swirls”

  • “Filler cracks by truck hinges”

  • “Filler in the lower rear of the front fenders”

Ownership History

This 1969 Buick GS400 was purchased by the seller in 2012. The vehicle was previously listed via Hagerty Marketplace in April 2023.

Included Items

• Reproduction window sticker

• Owner’s manuals

• Service books

• Multiple keys