507690 Bearing mainshaft, left
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Specifications
- Brand
- MCS
- Part Number
- 507690
- OEM Reference
- 8978
- Pack Quantity
- Each
- Category
- Transmission Bearings
- VAT Rate
- 20%
About This Product
The mainshaft bearing is a critical component for the longevity of your 5-speed transmission. This left-side mainshaft bearing from MCS is designed for 1980 to early 1984 FLT Touring and FXR models. It provides the necessary support for the mainshaft, ensuring proper alignment and reducing vibration within the gearbox. Given the stresses these early 5-speed units face, using a high-quality replacement like this one, which references OEM part 8978, is essential for a reliable build. It is sold individually and is a straightforward replacement for the factory bearing, helping you keep your classic rubber-mount Big Twin shifting smoothly for miles to come.
Manufacturer part number: 507690.
Fitment
9 models80-E84 FLT/Touring; FXR
FXR 3 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1982–1984 | FXR Low Glide FXRS |
| Harley-Davidson | 1982–1983 | FXR Super Glide FXR |
| Harley-Davidson | 1983–1984 | FXR Touring FXRT |
Tour Glide 2 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1980 | Touring Tour Glide FLT |
| Harley-Davidson | 1983 | Touring Tour Glide FLTD |
Touring 4 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1984 | Touring Electra Glide Classic FLHTC |
| Harley-Davidson | 1983 | Touring Electra Glide Standard FLHT |
| Harley-Davidson | 1980–1984 | Touring Tour Glide Classic FLTC |
| Harley-Davidson | 1981–1983 | Touring Tour Glide FLT |
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