Motorcycle transmission cover that replicates original equipment fit and finish for select Harley Big Twin motorcycles. Owners who want their bike to retain a factory appearance will appreciate the smooth chrome finish and direct-fit design. Is Billet Proof Designs Transmission Cover the correct replacement for a 5-speed EVO or Twin Cam setup?
⚡ At a Glance
- • Finish and Fit: Chrome plated smooth cover with faithful duplicate of OE contours for neat visual integration
- • Best for: Owners of 5-speed Harley Big Twin EVO and Twin Cam bikes seeking an OE-style replacement
- • Not ideal for: Bikes fitted with hydraulic clutch systems and FXR models
Smooth chrome plated cover duplicates OE appearance. Compatible with specified 1987–2006 Softail and Touring, and 1987–2005 Dyna FXD/FXDWG 5-speed models, excluding FXR.
Authentic OE appearance – with chrome plated smooth cover
Chrome plating creates a mirrored finish while faithful duplicate contours match original equipment shape and mounting geometry. The cover is manufactured to resemble OE styling closely.
Restores factory look and blends with surrounding chrome components for a cohesive finish. Ideal for riders who want a period-correct appearance after service or repair.
Simple fitment – with OEM-compatible mounting and hardware reuse
Designed to replace HD# 37105-87A and align with existing mounting points, allowing reuse of original fasteners. No special adaptors are required for standard 5-speed Big Twin installations.
Straightforward swap-in replacement for compatible gearboxes, reducing installation time. Keeps original mounting arrangement intact, useful for home mechanics and workshops alike.
Broad compatibility – with specific EVO and Twin Cam 5-speed layouts
Fits 1987–2006 Harley Softail and Touring models and 1987–2005 Dyna FXD/FXDWG models that use Big Twin Evolution EVO and Twin Cam 5-speed transmissions. Not suitable for FXR frames or hydraulic clutch setups.
A suitable choice for owners of the listed models who need a direct OE-style cover. Avoid for bikes with hydraulic clutch systems to prevent fitment issues.
✨ The 4 Key Reasons for Billet Proof Designs Transmission Cover
OE Duplicate Shape - Ensures precise alignment with existing gearbox mounting points
Smooth Chrome Finish - Delivers a mirrored appearance that restores factory styling
Direct Replacement for HD#37105-87A - Spares need for modification during standard fitment procedures
Hardware Reuse - Uses existing fasteners, simplifying installation and reducing workshop time
📋 Technical Details at a Glance
- Category: Transmission cover
- Brand: Billet Proof Designs
- Compatible models: 1987-2006 Harley Softail and Touring
- Compatible models: 1987-2005 Dyna FXD/FXDWG Big Twin Evolution EVO and Twin Cam
- Compatible transmissions: 5-speed, except FXR models
❓ Frequently Asked Questions
Q: Which Harley models will this cover fit?
A: It fits 1987–2006 Harley Softail and Touring models and 1987–2005 Dyna FXD/FXDWG models with Big Twin Evolution EVO and Twin Cam 5-speed transmissions, excluding FXR models.
Q: Can the cover be used with a hydraulic clutch?
A: No, not for use with hydraulic clutch systems.
Q: Does the cover replace the original HD part?
A: Yes, it replaces HD# 37105-87A and is designed to use existing hardware for installation.
🏆 Our Verdict
Suitable for owners of compatible Harley Big Twin EVO and Twin Cam 5-speed motorcycles seeking an OE-style replacement. Faithful duplication of OE shape and a smooth chrome plated finish restore factory appearance while allowing reuse of original mounting hardware. A straightforward, purpose-built replacement that keeps repair and maintenance simple for long-term ownership.
