There were eight Challenger models for 1970.
Challenger
Deputy (option code A93)
Two door hardtop
Two door convertible
SE two door hardtop
R/T two door hardtop
R/T two door convertible
R/T SE two door hardtop
T/A two door hardtop
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I'm sure the above writer took some of his information from this article from allpar.com, who in fact, is not even sure of the 71's existence either.
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1971 Dodge Challengers
For 1971, as in 1970, the Hemi was in the R/T lineup as well as the 440, and the standard 383; new was the light but high-performance 340. There were no R/T ragtops, but there were 340 ragtops that were essentially similar, except for the emblems and the R/T VIN code. As one would expect, the grille was changed.
1971 Challenger T/A
There are rumors of '71 T/As, but they had a 340-4 barrel.
By the same token, you could order a 340 R/T look-alike with a shaker and a go-wing, and most of the R/T paraphernalia, without the higher insurance premiums.
The main difference in the 1971 SE was the back window, which grew to normal size. There are rumors of '71 T/As, but they had a 340-4 barrel. The 383 was detuned to 300 hp, the base 440 was no longer available, and the 440 Six-Pack was now 5 hp lower. Sales were dramatically lower in 1971, despite being the Indy 500 pace car — or perhaps because the pace car crashed into the press box. Production was a mere 30,000 units or so.
Read more
here
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Source: allpar.com
by Kelly Doke-Journigan and the Allpar staff