The Harley-Davidson Softail family has been in production since 1984, defined by its hidden rear suspension that gives the visual appearance of a rigid hardtail frame. For parts buyers, the Softail line breaks into three major platform eras based on engine and chassis changes: Evolution-powered bikes (1984-1999), Twin Cam 88B/96B models (2000-2017), and the current Milwaukee-Eight chassis (2018+). The 2018 redesign was a ground-up change that also absorbed the former Dyna lineup, making it the most significant compatibility break in the family's history. Sun Coast processes Softail donors at our Odessa, Florida facility, where our technicians inspect and photograph each pulled component before assigning it a unique SKU.
Harley Softail platform overview
Within the 2000-2017 Twin Cam era, the Softail used a rigid-mount counterbalanced engine (the "B" in Twin Cam 88B and 96B designates the internal counterbalancer). Displacement grew from 88 cubic inches (1,450cc) to 96ci (1,584cc) in 2007, and select models received the 103ci (1,690cc) beginning in 2012. Frames, primary covers, and most sheet metal interchange within the Twin Cam Softail era regardless of displacement, but engine internals (cylinders, pistons, heads) differ by cubic-inch size. All Twin Cam Softails share the same five- or six-speed transmission mounting pattern, belt final drive, and hidden dual-shock rear suspension layout.
The 2018 redesign replaced the Twin Cam with the Milwaukee-Eight 107 (1,746cc) and 114 (1,868cc) engines featuring dual counterbalancers, a completely new frame that is 65% stiffer and up to 35 pounds lighter than the 2017 chassis, and a mono-shock rear suspension replacing the twin-shock design. Nothing from the 2017 and earlier Softail bolts onto a 2018+ frame. The 2018 redesign also eliminated the Dyna as a separate family: former Dyna models like the Street Bob, Low Rider, and Fat Bob moved onto the new Softail platform. The sub-model pages below include Fat Boy, Heritage, Deluxe, and Standard variants grouped by engine displacement era.
Pre-2000 Softails used the Evolution engine (1,340cc, 1984-1999) in 80 cubic inches. The Evolution Softail frame is different from the Twin Cam frame, and engine mounts, primary covers, and transmission housings changed with the Twin Cam introduction. Buyers with Evolution-era Softails should verify that parts are specifically listed for Evo models. Within the Twin Cam era, common replacement items include inner and outer primary covers, compensator sprockets (a known weak point on early Twin Cam 88B models), and starter motors. The six-speed Cruise Drive transmission replaced the five-speed in 2007 on most Softail models, so transmission internals and shifter components are not interchangeable across that split.
Shop Harley Softail parts by model
103ci Twin Cam:
96ci Twin Cam:
88ci Twin Cam:
Milwaukee-Eight and other:
Also see: Dyna Parts • Touring Parts • Sportster Parts • V-Rod Parts
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