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
-
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 -
ARLEN NESS Transmission Cover - Titanium 03-855
ARLEN NESS
$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
$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 -
EASTERN MOTORCYCLE PARTS Transmission Drive Gear Spacer Keys A-35175-38
EASTERN MOTORCYCLE PARTS
$12.10Transmission drive gear spacer keys are critical wear components that maintain precise gear alignment and prevent slippage under load. If your transmission exhibits delayed engagement, gear grinding, or difficulty shifting, worn spacer keys are often the...DS173417- SKU:
- DS173417
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- INSERT
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
$12.10 -
ARLEN NESS Transmission Cover - Black 03-826
ARLEN NESS
$179.95The OEM transmission cover on your '14-up Touring model can show wear, leaks, or damage that compromises both aesthetics and function. The ARLEN NESS Transmission Cover delivers a precision-machined replacement that restores proper sealing while offering...11050244- SKU:
- 11050244
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- COLOR/FINISH:
- BLACK ANODIZED
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
$179.95 -
ARLEN NESS Transmission Cover - Titanium 03-815
ARLEN NESS
$126.00The stock transmission cover is vulnerable to impact, road debris, and wear—leaving your drivetrain exposed. Upgrading to the ARLEN NESS Titanium Transmission Cover delivers OEM fitment with superior durability and a finished appearance that complements...11050243- SKU:
- 11050243
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- TITANIUM ANODIZED
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$126.00 -
ARLEN NESS Transmission Cover - Black 03-814
ARLEN NESS
$179.95The ARLEN NESS Transmission Cover transforms your transmission housing from a utilitarian component into a finished aesthetic element while protecting critical internals from debris and contamination. Whether you're running a '14-up Touring with fairing...11050242- SKU:
- 11050242
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK ANODIZED
- STYLE:
- 10 GAUGE
- TYPE:
- TRANSMISSION
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- MOUNTING STYLE:
- 6 HOLE
- UNITS:
- EACH
$179.95 -
ARLEN NESS Black 10 Gauge Top Transmission Cover 03-863
ARLEN NESS
$199.95A transmission cover serves as both a functional barrier and a visual statement on your bike. The ARLEN NESS Black 10 Gauge Top Transmission Cover protects your drivetrain while delivering the aggressive aesthetics that define quality custom builds...11050213- SKU:
- 11050213
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- STREET
- MODEL:
- 10 GAUGE
- PRODUCT NAME:
- TOP COVER
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- BLACK
- MOUNTING STYLE:
- 6 HOLE
- UNITS:
- EACH
$199.95 -
ARLEN NESS Chrome 10 Gauge Top Transmission Cover 03-862
ARLEN NESS
$199.95A transmission cover protects one of your engine's most critical components while serving as a visual anchor for your bike's aesthetic. The ARLEN NESS Chrome 10 Gauge Top Transmission Cover combines precision engineering with a polished finish that...11050212- SKU:
- 11050212
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- 10 GAUGE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- MOUNTING STYLE:
- 6 HOLE
- UNITS:
- EACH
- PRODUCT NAME:
- TOP COVER
- TYPE:
- TRANSMISSION
$199.95 -
ACCUTRONIX Transmission Dipstick - Chrome - Big Twin TDS01-KC
ACCUTRONIX
$63.95A worn or discolored dipstick can detract from an otherwise pristine transmission area, and the ACCUTRONIX Transmission Dipstick in chrome delivers both visual refinement and reliable fluid-level monitoring. This bolt-on replacement is engineered to fit...11050215- SKU:
- 11050215
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- CHROME
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- DIPSTICK
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- STYLE:
- KNURLED
$63.95 -
ACCUTRONIX Transmission Dipstick - Black - Big Twin TDS01-KN
ACCUTRONIX
$63.95A transmission dipstick might seem like a small detail, but a worn, discolored, or mismatched stick detracts from an otherwise clean engine bay. The ACCUTRONIX Transmission Dipstick replaces your stock unit with a sleek black finish that complements...11050216- SKU:
- 11050216
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- DIPSTICK
- UNITS:
- EACH
- TYPE:
- TRANSMISSION
- STYLE:
- KNURLED
- COLOR/FINISH:
- BLACK ANODIZED
- RIDING STYLE:
- STREET
$63.95 -
PERFORMANCE MACHINE (PM) Transmission Cover - Contrast Cut¢â€žÂ¢ - Scallop 0203-2018-BM
PERFORMANCE MACHINE (PM)
$333.95A transmission cover is one of the few engine bay components visible to the eye—and the OEM piece rarely reflects the quality of your build. This PM Contrast Cut cover replaces that plastic or stamped-steel original with a precision-machined billet...11050219- SKU:
- 11050219
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- MODEL:
- SCALLOP
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- CONTRAST CUT™
$333.95 -
PERFORMANCE MACHINE (PM) Transmission Cover - Platinum Cut¢â€žÂ¢ - Scallop 0203-2018-BMP
PERFORMANCE MACHINE (PM)
$333.95If you're running a high-performance build, your transmission cover does more than seal—it sets the tone for underhood aesthetics and protection. The PM Platinum Cut Scallop cover replaces your OEM unit with a CNC-machined billet aluminum piece that...11050220- SKU:
- 11050220
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- COLOR/FINISH:
- PLATINUM CUT
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MODEL:
- SCALLOP
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
$333.95 -
PERFORMANCE MACHINE (PM) Transmission Cover - Chrome - Scallop 0203-2018-CH
PERFORMANCE MACHINE (PM)
$333.95A stock transmission cover can warp under heat and lose its aesthetic appeal over time. The PM Transmission Cover delivers a precision-engineered replacement that combines durability with a refined finish, giving your engine bay the clean, professional...11050221- SKU:
- 11050221
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- MATERIAL:
- ALUMINUM
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- SCALLOP
- TYPE:
- TRANSMISSION
$333.95 -
PERFORMANCE MACHINE (PM) Transmission Cover - Chrome 0203-2020M-CH
PERFORMANCE MACHINE (PM)
$331.95Your transmission cover takes a beating from heat, UV exposure, and constant abrasion—stock plastic failures are common. The PM Transmission Cover replaces that weak point with precision-engineered billet aluminum and a crystal-clear polycarbonate lens...11050252- SKU:
- 11050252
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- COLOR/FINISH:
- CHROME
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$331.95
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.
