Dodge Built the 1970 Challenger T/A Just to Race – Then Walked Away and Killed It After One Season

The 1970 Dodge Challenger T/A existed because a racing rulebook demanded it, not because Dodge wanted to sell it. Here is how a 290-horsepower loophole became one of Mopar’s most collectible one-year wonders.

Dodge never built the Challenger T/A to sell it to the public. The company built exactly 2,399 of them because the SCCA’s Trans-Am rulebook demanded a street-legal production version before Dodge could even enter the race series. Under the fiberglass hood sat a 340-cubic-inch Six Pack V8 that Dodge officially rated at a suspiciously modest 290 horsepower — a number almost nobody who drove one actually believed. The side-exit exhaust, the matte-black hood, the Rallye wheels — none of it was a styling flourish dreamed up for showroom appeal. It was homologation paperwork made visible, bolted to a car. And after a single season of racing that never delivered Dodge a Trans-Am championship, the company walked away from the series entirely — taking the street car that existed only to support it down with it.

A Muscle Car Built to Satisfy a Rulebook, Not a Buyer

The Challenger T/A — “T/A” standing for Trans-Am — wasn’t dreamed up in a product-planning meeting about what customers wanted. It existed because SCCA rules for the Trans-American Sedan Championship required manufacturers to sell a minimum number of street versions of any car they wanted to race in the series’ Over 2.5-Liter class. Dodge had sat out Trans-Am since a disappointing 1967 campaign, but returned for 1970 with a factory-backed effort built around the brand-new E-body Challenger. To legally field that race car, Dodge needed a production street T/A to point to — so it built one, based on the Challenger R/T, and sold it through dealers for exactly one model year before quietly dropping it from the lineup.

That’s the part most owners discover only after they’ve already fallen for the car’s looks: the T/A isn’t really a muscle car that happened to go racing. It’s a race car that Dodge was legally obligated to let the public buy a few thousand copies of first, dressed up just enough to pass inspection at a dealership.

⚑ Featured Gear

Start Car Conversations →

As an Amazon Associate I earn from qualifying purchases.

The Six-Pack Engine Dodge Didn’t Dare Rate Honestly

Under that scooped hood sat a destroked version of Dodge’s 340 small-block, fed by three Holley two-barrel carburetors sitting on an aluminum Edelbrock intake manifold — the “Six Pack” setup that gave the car its bark. Dodge rated it at 290 horsepower, a figure most period road tests and present-day owners consider deeply conservative; real-world estimates from restorers and historians run closer to 320 to 350 horses once you account for how underrated most late-’60s and early-’70s factory muscle car engines were kept, largely for insurance purposes. Buyers could pair it with either a close-ratio four-speed manual or Chrysler’s TorqueFlite 727, a three-speed automatic — not a four-speed, despite some retellings claiming otherwise, since Chrysler didn’t offer a four-speed automatic transmission in that era at all.

The rest of the car was just as purpose-built. The non-functional hood scoop fed nothing but looked the part, the side-exit exhaust dumped in front of the rear wheels for a sound unlike anything else on a Dodge lot, and the staggered-width tires — narrower in front, wider in back — existed to mimic the race car’s handling setup rather than to look aggressive. Everything about the T/A traced back to the track, right down to the front and rear spoilers that actually did something at speed instead of just looking fast parked in a driveway.

One Season, One Walkout, One Legend

Dodge put driver Sam Posey behind the wheel of the factory Challenger T/A race car for the 1970 Trans-Am season, going up against Ford’s Mustang Boss 302, AMC’s Javelin, and Plymouth’s own homologation special, the AAR ‘Cuda — essentially the same car under a different badge, built to satisfy the same rulebook. The results were respectable but not championship-caliber; Dodge came away from the season without a series win. Rather than regroup and come back swinging in 1971, Dodge made the call to pull out of Trans-Am racing entirely after that single year. With no race program left to support, the street-legal justification for the T/A disappeared along with it, and Dodge never built another one. The car that existed to satisfy a rulebook outlived the rule it was built for by exactly zero seasons.

That abrupt ending is a big part of why the 1970 Challenger T/A has become one of the most sought-after Mopars of the muscle car era. It isn’t just rare because Dodge built fewer than 2,400 of them — it’s rare because the company had no reason, and no appetite, to ever build a second year’s worth. Unlike the standard Challenger R/T, which Dodge kept refining and selling for several more model years, the T/A is frozen in a single moment: one engine, one exhaust layout, one shot at a championship that never came.

How the T/A Stacked Up Against a Standard Challenger R/T

On paper, the T/A and a 340-powered Challenger R/T weren’t far apart — both rode on the same E-body platform, both could be ordered with performance-focused suspension, and both wore similar aggressive styling cues. The differences that mattered were underneath. The R/T’s standard 340 ran a single four-barrel carburetor, while the T/A’s destroked version of the same block ran the triple two-barrel Six Pack setup, which changed both the power delivery and the sound. The T/A also got the staggered tire sizing, the functional-looking hood scoop, the side exhaust, and front and rear spoilers that weren’t offered on a standard R/T order sheet. None of those changes were about making the T/A faster in a straight line for a buyer’s bragging rights — they were about making the street car close enough to the Trans-Am race car that SCCA officials would sign off on it.

For a buyer cross-shopping the two today, that distinction still matters. An R/T is a genuinely quick, attractive E-body Challenger that Dodge built for years and in real volume. A T/A is a snapshot of one very specific, very short-lived homologation requirement — which is exactly why collectors treat the two nameplates so differently despite how similar they can look parked side by side.

What Makes It Special

Drive one today and the T/A still feels like exactly what it was built to be: a street car with a competition engine wearing a license plate. The underrated 340 Six Pack pulls harder than its paper horsepower suggests, the side-exit exhaust still turns heads at every stoplight, and the staggered tire setup makes it handle noticeably different from a standard Challenger R/T of the same year. Because so few were built, finding a genuine, numbers-matching T/A today usually means dealing with a documented, well-known car rather than stumbling across a barn find — which is part of why values have climbed steadily as the people who remember exactly why Dodge built it in the first place have made sure the story doesn’t get lost. It’s a muscle car built almost by accident of paperwork — and it’s become legendary precisely because Dodge never meant to keep making it.

Buyers who wanted their homologation special to stand out could order it in one of Chrysler’s vivid “High Impact” colors — the same eye-searing palette that made Plum Crazy purple and Hemi Orange into Mopar legends in their own right. It’s a detail that undercuts the idea that the T/A was purely a clinical, racing-first product: Dodge still let buyers make it as loud to look at as it was to listen to, even while building it to satisfy a rulebook rather than a wish list.

Watch the full video above and let us know your thoughts in the comments.