Autoblog and Yahoo may earn commission from links in this article.This 1966 Mustang GT Coupe is a time capsule from the golden era, finished in Springtime Yellow—a color that screams classic Mustang. Inside, you get the black Pony-style luxury interior, and under the hood sits the A-code 289 V8 with 225 horses ready to run. Factory GT gear? Check. Rally-Pac gauges, power steering, front disc brakes, and those iconic styled-steel wheels? All present and accounted for. With 75,000 miles showing and a fresh $5,700 spent on mechanical TLC, this one's ready for its next chapter.1966 Ford Mustang Coupe GTBring a TrailerWhat It's Worth Right NowFirst-gen Mustang GT Hardtops are still flexing their muscles in the classic car market. Classic.com pegs the 1965–1966 GT Hardtop at a benchmark value of $33,516, with recent sales averaging $33,704. Not too shabby for a car pushing sixty.AdvertisementAdvertisementPrices are all over the map – beaters can go for $12,250, while the cream of the crop fetches up to $51,700. As always, originality, factory GT bits, what's under the hood, and how sharp it looks make all the difference.1966 Ford Mustang Coupe GTBring a TrailerThis Mustang? It's right in the sweet spot. Factory GT gear, luxury interior, and 75,000 miles – enough to enjoy, not so much to scare off collectors. The auction's just getting started, so we'll see if the bids climb toward that market average as the clock winds down.Condition and DetailsSpringtime Yellow paint, black vinyl roof – this coupe nails the classic Mustang GT vibe. Chrome bumpers, GT badges, styled-steel wheels, and that Pony-style interior keep things period-perfect. Inside, you'll find bucket seats, a woodgrain-trimmed console, Rally-Pac gauges, and a wood-rimmed steering wheel, just like the Mustang gods intended.1966 Ford Mustang Coupe GTBring a TrailerPop the hood and you'll find the A-code 289 V8 with a four-barrel carb, good for 225 horsepower. Power heads to the rear wheels via a C4 three-speed auto and an 8-inch rear with a 3.00:1 gear. Classic muscle, pure and simple.1966 Ford Mustang Coupe GTBring a TrailerThe seller dropped about $5,700 on mechanical fixes in January 2024 – think fresh brakes, rebuilt power steering, a tuned carb, new ignition bits, fuel system service, a new distributor, and a transmission fluid and filter change. It's not perfect, though: expect some paint cracks, a bit of rust at the back, a torn driver's seat, loose weatherstripping on the passenger door, and a cracked steering wheel rim. Honest car, honest flaws.1966 Ford Mustang Coupe GTBring a TrailerAdvertisementAdvertisementThe OfferSpecificationDetailMakeFordModelMustang Coupe GT A-Code 289Year1966Mileage75,000 miles shownEngine289-cu-in (4.7-liter) A-code V8Power225 horsepowerTransmissionThree-speed C4 automaticDrive TypeRear-wheel driveExterior ColorSpringtime YellowInterior ColorBlack Luxury (Pony-style) vinylFactory EquipmentGT package, Rally-Pac gauges, power steering, front disc brakes, styled-steel wheelsRecent Mechanical WorkAbout $5,700 completed in January 2024Interested in this 1966 Ford Mustang Coupe GT A-Code 289? View the listing here.What Makes the 1966 Ford Mustang Coupe GT UniqueBack in 1966, the Mustang GT was Ford's go-to performance package before Shelby stole the spotlight. GTs got front disc brakes, dual exhaust, fog lamps in the grille, quicker steering, styled-steel wheels, and a bunch of upgrades that set them apart from the regular herd – without making them a pain to drive every day.1966 Ford Mustang Coupe GTBring a TrailerThis one packs the sought-after A-code 289 V8, a step up from the base engine thanks to its four-barrel carb and extra punch. Throw in the Pony luxury interior and Rally-Pac gauges, and you've got a blend of muscle and comfort that keeps collectors coming back for more.Final ThoughtsThis Mustang isn't some pampered, low-mileage show queen – and honestly, that's what makes it interesting. It's a well-optioned GT coupe with fresh mechanical work and just enough originality to make it a solid player in today's classic Mustang scene.AdvertisementAdvertisementIf you want a first-gen Mustang you can actually drive – and still brag about owning a real-deal factory GT – this Springtime Yellow coupe ticks a lot of boxes. With the auction clock ticking, we'll soon see if it hits that sweet spot in the market for 1965–1966 GT hardtops.Disclaimer: This post is for informational purposes only. We are not a dealership or broker. All vehicle specifications, pricing, and availability are subject to change without notice. We are not responsible for typographical errors, omissions, or the accuracy of the provided information. Please verify all details directly with the seller.This story was originally published by Autoblog on Sep 6, 2026, where it first appeared in the Car Buying section. Add Autoblog as a Preferred Source by clicking here.