Twin Power Big Twin Clutch Hub 1984-1989 | Replaces H-D 37740-84A

Twin Power Big Twin Clutch Hub – 1984–1989 Harley-Davidson (Replaces H-D® 37740-84A)

Restore your clutch with confidence using this precision-engineered replacement clutch hub from Twin Power. Built to OEM specifications with a steel spine and aluminum hub construction, this direct-fit replacement eliminates guesswork and gets your Big Twin back on the road without modifications.

Key Features

• Direct OEM replacement for H-D® part number 37740-84A
• Steel splines with aluminum hub for strength and reduced weight
• Withstands extreme heat and heavy-duty riding conditions
• Direct fit — no modifications required for compatible models
• Precision-engineered for seamless clutch engagement and reliable performance

Specifications

• Brand: Twin Power
• Part Number: 489599
• Replaces OEM: H-D® 37740-84A
• Weight: 3.8 lbs
• Fitment: 1984–1989 Harley-Davidson Big Twin (FXR, FLT, Softail, and more — see fitment list)

Compatible Models (1984–1989)

Fits a wide range of Harley-Davidson Big Twin models including FLHS, FLHT, FLHTC, FLHTCU, FLST, FLSTC, FXR, FXRC, FXRD, FXRDG, FXRS, FXRS-SP, FXRT, FXST, FXSTC, FXSTS, FXWG, FXLR, and FXRPF Police variants. See tags for full year/model fitment list.