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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PAUGHCO Transmission Plate - OE Type 4-Speed 218
PAUGHCO
$151.95If you're running a four-speed Big Twin—whether it's a stock Knucklehead or a modern custom build—this transmission plate is engineered to handle the demands of real-world riding and racing. PAUGHCO's OE Type 4-Speed 218 delivers the durability and...11050011- SKU:
- 11050011
- Availability:
- Ships Same Business Day
- Weight:
- 3.74 LBS
- MATERIAL:
- STEEL
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- TRANSMISSION TYPE:
- 4-SPEED
- UNITS:
- EACH
- PRODUCT NAME:
- MOUNTING PLATE
$151.95Qty in Cart: 0Quantity:Price:$151.95Subtotal: -
PAUGHCO Plate - 5/4 Speed Conversion 218-1
PAUGHCO
$151.95If you're running a Big Twin with a four-speed transmission and need a reliable, purpose-built conversion solution, the PAUGHCO Plate 218-1 eliminates the guesswork of custom fabrication. This heavy-duty plate integrates seamlessly into Paughco Easyride...11050012- SKU:
- 11050012
- Availability:
- Ships Same Business Day
- Weight:
- 3.70 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- PRODUCT NAME:
- MOUNTING PLATE
- TYPE:
- TRANSMISSION
- MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
$151.95 -
PAUGHCO Transmission Mounting Plate 218-A
PAUGHCO
$112.95If you're running a Softail 5-speed transmission in a rigid Paughco frame, this mounting plate is the critical interface that ensures proper transmission alignment and stability under load. A precision-engineered solution eliminates guesswork and...11050013- SKU:
- 11050013
- Availability:
- Ships Same Business Day
- Weight:
- 1.56 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- MOUNTING PLATE
- TRANSMISSION TYPE:
- 5-SPEED
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
$112.95Qty in Cart: 0Quantity:Price:$112.95Subtotal: -
NAMZ Neutral Switch Eliminator Plug NNSE-P01
NAMZ
$55.95If you're running a custom transmission setup or eliminating unnecessary wiring in your hot rod build, this neutral switch eliminator plug seals off the neutral safety switch opening cleanly—no exposed holes, no messy adapters. The stainless steel...11050236- SKU:
- 11050236
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PLUG
- MATERIAL:
- STAINLESS STEEL
- TYPE:
- NEUTRAL SWITCH
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$55.95 -
DRAG SPECIALTIES Transmission Mounting Plate 74728
DRAG SPECIALTIES
$38.06A solid transmission mount is critical to keeping your drivetrain aligned and reducing unwanted vibration during hard acceleration. The DRAG Specialties Transmission Mounting Plate 74728 provides a dependable, chrome-finished solution for 5-speed...DS243621- SKU:
- DS243621
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- MOUNTING PLATE
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$38.06 -
GARDNER-WESTCOTT Transmission Oil Fill Plug C-80-14
GARDNER-WESTCOTT
$21.95Show-chromed Allen-head plug includes oil level dipstick and O-ring, Made in the U.S.A.DS193860- SKU:
- DS193860
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- FILL PLUG
- TRANSMISSION TYPE:
- 5-SPEED
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$21.95 -
On Sale
COVINGTONS Transmission Cover C1365-B
COVINGTONS
MSRP: $381.95Now: $244.00Was: $381.95CNC-machined from billet aluminum, Direct bolt-on replacement for the stock cover, Made in the U.S.A.11050255- SKU:
- 11050255
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- STREET
- STYLE:
- DIMPLED
- UNITS:
- EACH
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- TRANSMISSION TYPE:
- HYDRAULIC
MSRP: $381.95Now: $244.00Was: $381.95 -
COVINGTONS Transmission Cover C1372-C
COVINGTONS
$317.95CNC machined from billet aluminum, Direct bolt-on replacement for the stock cover, Made in the U.S.A.11050206- SKU:
- 11050206
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- COVER
- TRANSMISSION TYPE:
- MECHANICAL
- UNITS:
- EACH
- MATERIAL:
- BILLET ALUMINUM
- STYLE:
- SMOOTH
- COLOR/FINISH:
- CHROME
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION TOP
$317.95 -
COVINGTONS Transmission Cover C1371-C
COVINGTONS
$317.95CNC machined from billet aluminum, Direct bolt-on replacement for the stock cover, Made in the U.S.A.11050145- SKU:
- 11050145
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- MOUNTING STYLE:
- 6 HOLE
- STYLE:
- DIMPLED
- TYPE:
- TRANSMISSION TOP
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- TRANSMISSION TYPE:
- 6-SPEED
$317.95Qty in Cart: 0Quantity:Price:$317.95Subtotal: -
On Sale
ARLEN NESS Transmission Side Cover - Chrome - Cable 03-812
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95The ARLEN NESS Transmission Side Cover elevates your bike's aesthetics while delivering the durability required for high-performance riding. This billet aluminum replacement maintains OEM fitment and function, eliminating the need for custom fabrication...11050107- SKU:
- 11050107
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
- MOUNTING STYLE:
- 6 HOLE
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- SIDE COVER
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
MSRP: $179.95Now: $163.75Was: $179.95 -
On Sale
ARLEN NESS Black 10 Gauge Top Transmission Cover 03-853
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95A transmission cover isn't just cosmetic—it protects your drivetrain from debris, heat, and moisture while maintaining a clean engine bay aesthetic. The ARLEN NESS Black 10 Gauge Top Transmission Cover delivers precision engineering with billet aluminum...11050112- SKU:
- 11050112
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- COLOR/FINISH:
- BLACK
- MODEL:
- 10 GAUGE
- MOUNTING STYLE:
- 6 HOLE
- PRODUCT NAME:
- TOP COVER
- TYPE:
- TRANSMISSION
- UNITS:
- EACH
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- STREET
MSRP: $179.95Now: $163.75Was: $179.95 -
On Sale
ARLEN NESS Transmission Cover - Black 03-854
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95The ARLEN NESS Transmission Cover replaces worn or damaged OEM covers while maintaining proper gasket sealing and hardware integrity. This direct-fit replacement eliminates oil leaks and restores a clean, finished appearance to your transmission assembly...11050246- SKU:
- 11050246
- Availability:
- Ships Same Business Day
- Weight:
- 3.60 LBS
- UNITS:
- EACH
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- STYLE:
- 10 GAUGE
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- TRANSMISSION
MSRP: $179.95Now: $163.75Was: $179.95 -
On Sale
ARLEN NESS Transmission Cover - Black 03-864
ARLEN NESS
MSRP: $209.95Now: $191.05Was: $209.95The ARLEN NESS Transmission Cover replaces your OEM side cover with a precision-engineered component that maintains critical sealing while delivering a refined aesthetic upgrade. This bolt-on cover includes all necessary gaskets and hardware, eliminating...11050248- SKU:
- 11050248
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- MATERIAL:
- 6061 T-6 ALUMINUM
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK ANODIZED
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
MSRP: $209.95Now: $191.05Was: $209.95 -
On Sale
ARLEN NESS Transmission Side Cover - Black - Cable 03-813
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95The Arlen Ness Transmission Side Cover elevates your bike's aesthetic while protecting critical drivetrain components from road debris and weather exposure. Machined from premium billet aluminum, this cover delivers the durability demanded by serious...11050108- SKU:
- 11050108
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- COLOR/FINISH:
- BLACK
- MOUNTING STYLE:
- 6 HOLE
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- SIDE COVER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
MSRP: $179.95Now: $163.75Was: $179.95 -
On Sale
ARLEN NESS Transmission Cover - Chrome 03-822
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95The OEM transmission cover on your touring model takes a beating—road debris, moisture, and vibration degrade both its appearance and protective function. The ARLEN NESS Transmission Cover upgrades your bike with a polished chrome finish that resists...11050109- SKU:
- 11050109
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
MSRP: $179.95Now: $163.75Was: $179.95 -
On Sale
ARLEN NESS Chrome 10 Gauge Top Transmission Cover 03-852
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95Machined from billet aluminum, Includes necessary gasket and hardware11050111- SKU:
- 11050111
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- 10 GAUGE
- PRODUCT NAME:
- TOP COVER
- TYPE:
- TRANSMISSION
- UNITS:
- EACH
MSRP: $179.95Now: $163.75Was: $179.95 -
On Sale
ARLEN NESS Transmission Cover - Titanium 03-855
ARLEN NESS
MSRP: $179.95Now: $163.75Was: $179.95Replaces OEM transmission side cover, Includes necessary gaskets and hardware11050247- SKU:
- 11050247
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COLOR/FINISH:
- TITANIUM ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
MSRP: $179.95Now: $163.75Was: $179.95 -
On Sale
ARLEN NESS Transmission Cover - Titanium 03-865
ARLEN NESS
Now: $133.77Was: $147.00Replaces OEM transmission side cover, Includes necessary gaskets and hardware11050249- SKU:
- 11050249
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- COLOR/FINISH:
- TITANIUM ANODIZED
- MATERIAL:
- 6061 T-6 ALUMINUM
- RIDING STYLE:
- STREET
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- MOUNTING STYLE:
- 6 HOLE
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
Now: $133.77Was: $147.00 -
EASTERN MOTORCYCLE PARTS Oil Pump Pinion Gear - Big Twin A-26349-73A
EASTERN MOTORCYCLE PARTS
$49.95A reliable oil pump pinion gear is critical to maintaining consistent oil pressure and protecting your Big Twin engine from premature wear. This OEM-equivalent component ensures proper lubrication under demanding riding conditions, whether you're...DS194007- SKU:
- DS194007
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- DRIVE GEAR
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- OIL PUMP
$49.95 -
EASTERN MOTORCYCLE PARTS Drain Plug A-60348-65B
EASTERN MOTORCYCLE PARTS
$12.95A quality drain plug is fundamental to proper engine maintenance—it's your first line of defense against metal contamination and sludge buildup that compromises performance. This EASTERN MOTORCYCLE PARTS drain plug delivers reliable sealing and corrosion...11050091- SKU:
- 11050091
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- MAGNETIC
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- DRAIN PLUG
- UNITS:
- EACH
- COLOR/FINISH:
- ZINC
$12.95
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.
