A 1970-only model was the Dodge Challenger T/A (Trans Am) racing homologation car. In order to race in the Sports Car Club of America's Trans American Sedan Championship Trans Am, Dodge built a street version of its race car (just like Plymouth with its Plymouth 'Cuda  AAR) which it called the Dodge Challenger T/A (Trans Am). Although the  race cars ran a destroked version of the 340, street versions took the  340 and added a trio of two-barrel carburetors atop an Edelbrock  aluminum intake manifold, creating the 340 Six Pack. Dodge rated the 340  Six Pack at 290 bhp (216.3 kW), only 15 bhp (11 kW) more than the  original 340 engine (which also had the same rating as the Camaro Z/28 and Ford Boss 302 Mustang).  The engine actually made about 320 bhp (238.6 kW). It breathed air  through a suitcase sized air scoop molded into the pinned down, hinged  matte-black fiberglass hood. Low-restriction dual exhausts ran to the  stock muffler location, then reversed direction to exit in chrome tipped  "megaphone" outlets in front of the rear wheels. Options included a  TorqueFlite automatic or pistol-grip Hurst-shifted  four-speed transmission, 3.55:1 or 3.90:1 gears, as well as manual or  power steering. Front disc brakes were standard. The special Rallye  suspension used heavy duty parts and increased the rate of the rear  springs. The T/A was the first U.S. muscle car to fit different size  tires front and rear to give a racing stance: E60x15 in the front, and  G60x15 in the rear. The modified chamber elevated the tail enough to  clear the rear rubber and its side exhaust outlets. Thick dual side  stripes, bold ID graphics, a fiberglass ducktail rear spoiler, and a  fiberglass front spoiler added to the racing image. The interior was  strictly stock Challenger.
 Dodge contracted Ray Caldwell's Autodynamics firm in Marblehead, Massachusetts to run the factory Trans-Am team. Sam Posey  drove the #77 "sub-lime" painted car that Caldwell's team built from a  car taken off a local dealer's showroom floor. When the #76 was  completed mid-season from a chassis provided by Dan Gurney's All  American Racers, Posey alternated between the two. Both cars ran the  final two races, with Posey in the #77. Ronnie Bucknum drove the #76 at Seattle Washington, and Tony Adamowicz drove it at Riverside, California.
 The Challenger T/A's scored a few top three finishes, but lack of a development budget and the short-lived Keith Black 303 c. i. engines led to Dodge leaving the series at season's end. .
 The street version suffered from severe understeer in fast corners,  largely due to the smaller front tires. Only 2,399 T/As were made. A  1971 model using the 340 engine with a 4-barrel carburetor was planned  and appeared in advertising, but was not produced since Dodge had left  the race series.
 The "Western Special" was a version available only to west coast  dealers. It came with a rear-exit exhaust system and Western Special  identification on the rear decklid. Some examples came with a  vacuum-operated trunk release. Another late production version was the  low-priced "Deputy", stripped of some of the base car's trim and with  fixed rear side glass.
  By 1972, the convertible version and all the big-block engine options  were gone. Maximum power was also downgraded to 240 horsepower (180 kW)  to reflect the more accurate Society of Automotive Engineers  (SAE) net hp calculations. The 1972 models also received a new grille  that extended beneath the front bumper. The only 1972 convertibles which  exist are actually 1971 models with the 1972 front end (grille, lights,  etc.) and rear end (tail lights and their panel). These were specially  built for TV programs such as "Mod Squad". The only way to ascertain a  'real' 1972 Challenger convertible is to look at its fender tag. On the  code line which gives the dealer order number, that number will start  with an "R", which designates "Special Meaning" (in this case, a TV  'special promotions' car).
  
   1973 Dodge Challenger Rallye
       
   1974 Dodge Challenger R/T
      The 1973 models were no longer available with a six-cylinder engine.  For 1974, the 340 cu in (5.6 L) engine was replaced by a 360 cu in (5.9  L) version, but the pony car market had deteriorated and production of  Challengers ceased in mid-1974.
 [edit] Cosmetic variations
  
   Protruding bumper guards, 1973
       
   Center backup light, 1970
      Although the body style remained the same throughout the Challenger's  five year run, there were two notable changes to the front grille. The  1971 models had a "split" grille, while 1972 introduced a design that  extended the grille (nicknamed the "sad-mouth") beneath the front  bumper. With this change to the front end, 1972 through 1974 models had  little to no variation. The only way to properly distinguish them is  that the 1972s had flush mounted bumpers with no bumper guards, (small  bumper guards were optional), while both the 1973 and 1974 models had  the protruding "5 mph (8.0 km/h)" bumpers (with a rubber type filler  behind them) in conjunction with large bumper guards. The 1974 cars had  larger rear bumper guards to meet the (new for 1974 and on) rear 5 mph  rear impact law. These changes were made to meet U.S. regulations  regarding crash test safety.
 The 1970 taillights went all the way across the back of the car, with  the backup light in the middle of the rear. In 1971, the backup lights  were on the left and right instead of the middle. The taillight array  also changed for 1972 onwards, with the Challenger now having four  individual rectangular lamps.
 [edit] Collectibility
 Although few mourned the end of the E-body models, the passage of  time has created legends and highlighted the unique personalities of  both the Challenger and the Barracuda.[2] In a historic review, the editors of Edmunds Inside Line  ranked these models as: 1970 was a "great" year, 1971 was a "good" one,  and then "three progressively lousier ones" (1972–1974).[2]  With total sales and production off by 2/3rds from 1970, the  performance engine 1971 Challengers are the most rare. Sales and  production of the 1973 cars (with only two V8s available) actually  exceeded 1971 by approximately 1,000 cars. This may be explained by 1973  being a very good year for the U.S. auto industry in general and an  increased interest in Chrysler (the Plymouth Barracuda and Plymouth Road Runner also saw sales increases) performance cars.
 Original "numbers matching" high-performance 1970-71 Challengers are now among the most sought-after collector cars.[citation needed]  The rarity of specific models with big engines is the result of low  buyer interest and sales with the correspondingly low production when  new. The 440 and the 426 Hemi engines nowadays command sizable premiums  over the smaller engines.The 1970 and 1971 models tend to generate more  attention as performance and style options were still available to the  public. However, with the popularity of these vehicles increasing, and  the number of usable and restorable Challengers falling, many collectors  now search for later models. Many "clones" of the 1970 and 1971  Challengers with high-performance drivetrains have been created by using  low-end 6-cylinder and 318-powered non-R/T or T/A cars and installing  one of the "Magnum" performance engine combinations (340, 383, 440 or  426 Hemi) and adding the specific badging and hoods. Total production  (1970–74) was only about 168,000 cars, and perhaps 1/3 of that number  now exist in any condition.
Dodge Challenger
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