Harley-Davidson Dyna Switchback

To 1971. The Dyna family used the 88-cubic-inch (1,440 cc) twin cam

The line continued with the limited edition FXDB Daytona and a production model FXD Super Glide. The new DYNA frame featured big-twin engines and traditional styling.

The displacement was increased to 96 cubic inches (1,570 cc) as the factory increased the stroke to 4.375 inches (111.1 mm).

The Dyna Fat Bob (FXDF) was introduced to the Dyna lineup, featuring aggressive styling like a new 2–1–2 exhaust, twin headlamps, a 180 mm rear tire, and, for the first time in the Dyna lineup, a 130 mm front tire.

The Dyna Switchback (FLD) became the first Dyna to break the tradition of having an FX model designation with floorboards, detachable painted hard saddlebags, touring windshield, headlight nacelle and a wide front tire with full fender. The new front end resembled the big-twin FL models The manufacturer began to offer Dyna models with the 103-cubic-inch (1,690 cc) upgrade. All Dyna models use a rubber-mounted engine to isolate engine vibration.

Having been replaced by a completely redesigned Softail chassis; some of the existing models previously released by the company under the Dyna nameplate have since been carried over to the new Softail line.