Harley Transmission Cases and Covers
Harley Bike Transmission Cases & Covers at JJ Motorsports
Upgrade the look and function of your Harley’s transmission with premium cases and covers from JJ Motorsports, featuring chrome billet designs and conversion plates for classic style and perfect fit on Big Twin, Evo, and Twin Cam models. These durable parts protect internals while adding custom flair.
Shop Paughco and Arlen Ness transmission cases and covers for proven quality. Explore related categories such as Harley drivetrain for clutches and belts, or Harley for primary covers and derby covers to complete your custom build.
Top Harley Transmission Cases & Covers
- Paughco Plate 5-4 Speed Conversion 218-1 – Conversion plate for 5-speed in 4-speed cases; perfect for ratchet-top and early Big Twin builds.
- Arlen Ness Transmission Side Cover Chrome Cable 03-812 – Chrome 10-Gauge side cover for cable-clutch Twin Cam; clean look with hidden hardware.
- Arlen Ness Chrome 10-Gauge Top Transmission Cover 03-852 – Chrome top cover with 10-Gauge styling; matches Ness derby and primary covers.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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DRAG SPECIALTIES Transmission Top Cover - Black I35-0028MB
DRAG SPECIALTIES
$106.04A clean, finished transmission top cover is essential for a professional-looking engine bay and protecting critical drivetrain components from debris and contamination. The DRAG SPECIALTIES flat black finish integrates seamlessly with modern engine...11050209- SKU:
- 11050209
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- POWDER-COATED
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION TOP
$106.04 -
DRAG SPECIALTIES Transmission Top Cover I35-0029MB/G
DRAG SPECIALTIES
$115.31A properly sealed transmission top cover is essential for maintaining fluid integrity and preventing contamination during high-performance operation. This DRAG SPECIALTIES cover features die-cast construction for durability while the included...11050251- SKU:
- 11050251
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION TOP
- UNITS:
- KIT
- COLOR/FINISH:
- MATTE BLACK
$115.31 -
On Sale
S&S CYCLE Trap Door 56-1027
S&S CYCLE
MSRP: $519.95Now: $467.96Was: $519.95The S&S Cycle Trap Door (56-1027) is engineered for riders who demand reliable, precision-built components that integrate seamlessly with high-performance engine systems. This billet construction piece eliminates common air leakage issues while...561027- SKU:
- 561027
- Availability:
- Ships Same Business Day
- Weight:
- 3.15 LBS
- TRANSMISSION TYPE:
- 5-SPEED
- TYPE:
- TRANSMISSION
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- TRAP DOOR
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $519.95Now: $467.96Was: $519.95 -
On Sale
S&S CYCLE Transmission Door 56-1025
S&S CYCLE
MSRP: $443.95Now: $399.56Was: $443.95A transmission door serves as a critical access point for routine maintenance, fluid checks, and internal inspections on your Harley-Davidson. The S&S Cycle Transmission Door 56-1025 replaces worn or damaged OEM doors with a billet-aluminum component...11050229- SKU:
- 11050229
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- CASE
- UNITS:
- EACH
MSRP: $443.95Now: $399.56Was: $443.95 -
DRAG SPECIALTIES Transmission Cover - Chrome 302092-BC403
DRAG SPECIALTIES
$89.56A polished transmission cover isn't just cosmetic—it protects your transmission case from debris, road salt, and impact while presenting a finished, professional appearance in the engine bay. Chrome finishes resist corrosion and maintain their shine...DS325519- SKU:
- DS325519
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- PRODUCT NAME:
- COVER
- TYPE:
- TRANSMISSION SIDE
- MOUNTING STYLE:
- 6 HOLE
- MATERIAL:
- ZINC
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$89.56 -
DRAG SPECIALTIES Transmission Top Cover I35-0029C/G
DRAG SPECIALTIES
$115.31A transmission top cover is essential for maintaining proper fluid containment and preventing contamination of your transmission's internal components. This DRAG SPECIALTIES cover features die-cast construction for durability and includes a factory-spec...11050250- SKU:
- 11050250
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION TOP
$115.31 -
DRAG SPECIALTIES Transmission Top Cover - Black 35-0027MB
DRAG SPECIALTIES
$77.20A transmission top cover serves as both a functional and aesthetic component that protects your transmission while maintaining a cohesive engine bay appearance. This DRAG SPECIALTIES cover in flat black pairs seamlessly with modern black or chrome engine...11050210- SKU:
- 11050210
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- COLOR/FINISH:
- BLACK
- MOUNTING STYLE:
- 5 HOLE
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- POWDER-COATED
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION TOP
$77.20 -
DRAG SPECIALTIES Transmission Dipstick 77557
DRAG SPECIALTIES
$26.73Accurate transmission fluid monitoring is essential for maintaining optimal hydraulic pressure, shift quality, and component longevity. A worn or damaged dipstick can lead to overfilling, underfilling, or contamination—each of which compromises...11050139- SKU:
- 11050139
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- DIPSTICK
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
$26.73 -
DRAG SPECIALTIES Transmission Dipstick 77742
DRAG SPECIALTIES
$26.73Accurate transmission fluid monitoring is non-negotiable for engine longevity and performance. A quality dipstick provides immediate feedback on fluid level and condition, preventing costly damage from overfill or starvation. The DRAG SPECIALTIES 77742...11050146- SKU:
- 11050146
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- DIPSTICK
- RIDING STYLE:
- STREET
$26.73Qty in Cart: 0Quantity:Price:$26.73Subtotal: -
On Sale
ARLEN NESS Transmission Cover - Black 03-823
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95The ARLEN NESS Transmission Cover replaces worn or damaged OEM covers while maintaining the clean aesthetic of your Harley's drivetrain. This precision-engineered cover protects critical hydraulic components and is available in both hydraulic and...11050110- SKU:
- 11050110
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK ANODIZED
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- RAW
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
MSRP: $179.95Now: $163.75Was: $179.95 -
DRAG SPECIALTIES Transmission Dipstick I30-0310
DRAG SPECIALTIES
$22.61Accurate transmission fluid monitoring is critical for maintaining optimal shift quality, prolonged transmission life, and preventing costly internal damage from running low or overfilled. The DRAG SPECIALTIES Transmission Dipstick delivers the precision...11050022- SKU:
- 11050022
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- MATERIAL:
- BILLET STEEL
- PRODUCT NAME:
- FILL PLUG
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$22.61Qty in Cart: 0Quantity:Price:$22.61Subtotal:
Buying Guide and FAQs
Buying Guide: Factors to Consider When Choosing Harley Bike Transmission Cases and Covers
- Compatibility: Ensure parts fit your Harley's model (e.g., Big Twins with 4-speed or 5-speed transmissions, Knuckleheads, Softail frames, rigid frames). Use the vehicle selector for year-specific matches (e.g., 1946-1984 FL/FLH, 1986-2006 Softail) to avoid mounting or fit issues.
- Type of Use: For custom builds or frame conversions, opt for transmission mounting plates; aesthetic upgrades benefit from CNC-machined covers for style in street riding; hardware like plugs suits maintenance in daily or touring conditions.
- Components and Upgrades: Select mounting plates (OE type or 5/4-speed conversion), covers (top/side, dimpled/smooth), or hardware (plugs, gears). Focus on features like heavy-duty steel, billet aluminum, CNC machining, and chrome/black finishes for enhanced durability and aesthetics.
- Brand and Quality: Choose Paughco for heavy-duty chrome plates, Covingtons for CNC billet covers, Arlen Ness for 10 Gauge machined options, Namz for stainless plugs, Gardner-Westcott for dipstick plugs, or Eastern for zinc magnetic drains/gears. Prioritize USA-made materials for corrosion resistance and longevity.
- Installation and Cost: Most parts are easy bolt-in replacements with included hardware (e.g., gaskets for covers); prices range from $12.95 for plugs to $381.95 for billet covers—factor in made-in-USA quality and free shipping over $99 for value.
Frequently Asked Questions (FAQs)
- What Harley models do these transmission cases and covers support? Parts support Big Twins (e.g., Knuckleheads, Softail frames 1986-2006), rigid/swingarm frames, and specific years like 1946-1984 FL/FLH—use the year/make/model filter for exact compatibility.
- How do billet covers improve aesthetics? CNC-machined from billet aluminum with dimpled/smooth styles and chrome/black finishes, they provide a custom look while being direct bolt-on replacements.
- What is typically included with covers? Many include gaskets and hardware; mounting plates are standalone for easy installation in custom frames.
- Are these parts suitable for 4-speed vs. 5-speed? Yes, specific plates for 4-speed OE type or 5/4-speed conversions, with covers versatile for hydraulic/mechanical transmissions.
- What if a part doesn't fit my Harley? Verify transmission type (4/5-speed), frame (rigid/swingarm/Softail), and year before buying. Our returns policy allows exchanges or refunds if it doesn't match.
- Can I find related drivetrain parts? Yes—explore clutches, belts, or sprockets in the Harley drivetrain category to complement your transmission upgrade for better performance.
