Year by Year Changes, Production Numbers, and Cost:

1970 first year duster was offered (came out in late 69 but as a 70's model) plymouth duster 340 cost $2,547

1971 The Twister, a new trim level between the Duster and the Duster 340, debuted for 1971.The Duster 340 (but not the base Duster or Twister) also received a new "sharktooth" grille

1972 Dodge re-rated all of its engines to the new SAE Net standard. The top of the line 340 saw its rating drop from 275 bhp SAE Gross to 240 bhp SAE Net. The Twister trim continued, but lost the unique hood and grille. All Dusters received a new set of long thin taillights, and standardized marker lights. The 198 Slant Six engine was dropped. The hood scoop was changed to a new dual snorkel scoop, similar to the 1970 Dodge Challenger T/A. The "Gold Duster", a new appearance trim was also introduced.

1973 the Duster 340 lose its unique grille and all Dusters received a new grille, bringing them in line with other A-body cars. The taillights were changed, and the old sleek bumpers were replaced with bulky bumpers to meet the new Federally mandated 5 mph standard. A new model, the Space Duster, was added. This model featured a fold down rear seat and folding trunk separator which resulted in over 50 cubic feet of cargo space.

1974 the most successful sales year for the Duster. Unfortunately, this would also be the year that the 340 V8 was dropped and replaced by the 360 V8. Despite the greater displacement, decent 245 bhp rating and greater torque, the heavier 360 engine couldn't match the outright performance of the old 340.

1975 The Plymouth Duster's engines were detuned for 1975. The 360 V8 dropped from 245 bhp to 230 bhp. The Twister was discontinued.

1976 The Plymouth Duster's engines were detuned again for 1976. The 360 V8 dropped another 10 bhp to just 220 bhp. New this year was the "Feather Duster." This trim would feature a slant six engine with a lightweight deck lid and special exhaust system and was tuned for maximum fuel economy. Available with either a three speed manual or automatic transmission, the Feather Duster could achieve over 30 mpg - a major accomplishment in 1976. There was also a "Spirit of 76" Duster that featured a "Spirit of 76" sticker on the rear quarter panels. This would be the last year of the A-body Dusters. The Duster name would continue on, but they would be on the F-body platform