Harley Transmission Covers
Harley-Davidson Transmission Covers at JJ Motorsports
Shield your Harley's primary and transmission with premium covers from JJ Motorsports, featuring chrome and black finishes for classic style and durability on Big Twin, Evo, and Twin Cam models. These billet and cast covers protect internals while adding custom flair.
Shop Paughco, Thrashin Supply Co, and Drag Specialties transmission covers for proven quality. Explore related categories such as Harley drivetrain for clutch and chains, or Harley for exhaust and seats to complete your build.
Top Harley-Davidson Transmission Covers
- Paughco Outer Primary Cover B750 – Cast aluminum outer primary cover; vintage-style for Big Twin models with clean fit.
- Thrashin Supply Co Derby Cover Black Classic TSC-3000-4 – Black classic derby cover; CNC-machined for Evo and Twin Cam with hidden fasteners.
- Drag Specialties Outer Primary Cover Chrome Narrow Profile 77957 – Chrome narrow primary cover; low-profile for custom Softail and Dyna builds.
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
-
TRASK COVER DERBY ASLT GLS BLK TM-0042BK
TRASK
$279.95A derby cover isn't just about aesthetics—it's about protecting your engine's internals from debris, moisture, and contamination while maintaining a clean, finished appearance. The TRASK Derby Cover combines durable construction with a sleek black...11070685- SKU:
- 11070685
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
$279.95 -
TRASK Assault Derby Cover - Gloss Black TM-0041BK
TRASK
$279.95A quality derby cover protects your engine's internals from debris and moisture while maintaining the aggressive aesthetic of your build. The TRASK Assault Derby Cover delivers both functionality and style with precision-machined construction that...11070637- SKU:
- 11070637
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- MODEL:
- ASSAULT
- RIDING STYLE:
- STREET
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- COLOR/FINISH:
- GLOSS BLACK
$279.95 -
THRASHIN SUPPLY CO. M8 - Derby Cover Finned - Chrome TSC-3017-3
THRASHIN SUPPLY CO.
$179.95A quality derby cover protects your primary case from debris and road hazards while maintaining a clean, finished look at the heart of your engine. Thrashin Supply Co.'s finned design adds visual depth and airflow management without sacrificing...11070695- SKU:
- 11070695
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- MOUNTING STYLE:
- 5 HOLE
- PRODUCT NAME:
- DERBY COVER
- MATERIAL:
- 6061 BILLET ALUMINUM
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- STYLE:
- FINNED
- UNITS:
- EACH
$179.95 -
THRASHIN SUPPLY CO. Derby Cover - Polished - Classic TSC-3000-2
THRASHIN SUPPLY CO.
$119.95A polished derby cover transforms your engine's appearance while protecting critical internal components from contamination and moisture. This classic design delivers the refined aesthetic that separates a meticulously maintained machine from an...11070584- SKU:
- 11070584
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- MATERIAL:
- 6061 BILLET ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- STYLE:
- CLASSIC
- UNITS:
- EACH
- MOUNTING STYLE:
- 3 HOLE
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
THRASHIN SUPPLY CO. Derby Cover - Black - Classic TSC-3000-4
THRASHIN SUPPLY CO.
$119.95A quality derby cover protects your primary case from road debris, moisture, and oxidation while maintaining a clean, finished appearance on your engine. The THRASHIN SUPPLY CO. Classic TSC-3000-4 combines durable construction with straightforward...11070585- SKU:
- 11070585
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- COLOR/FINISH:
- BLACK
- MOUNTING STYLE:
- 3 HOLE
- RIDING STYLE:
- STREET
- MATERIAL:
- 6061 BILLET ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- STYLE:
- CLASSIC
$119.95 -
JOKER MACHINE Inspection Cover 10-664B
JOKER MACHINE
$47.95An inspection cover that actually looks the part. The JOKER MACHINE 10-664B delivers clean aesthetics without sacrificing functionality—precision CNC-milling ensures a perfect fit and professional finish on your engine bay. This is the kind of detail...11070260- SKU:
- 11070260
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- MATERIAL:
- 6061 T-6 ALUMINUM
- MOUNTING STYLE:
- 2 HOLE
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- STYLE:
- FINNED
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- TYPE:
- INSPECTION
$47.95 -
JOKER MACHINE Inspection Cover 10-665B
JOKER MACHINE
$47.95Engine bay aesthetics matter when you're putting serious work into your build. The JOKER MACHINE Inspection Cover delivers a refined, finished look while protecting critical engine components from debris and contamination. This is the kind of attention...11070263- SKU:
- 11070263
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MATERIAL:
- 6061 T-6 ALUMINUM
- RIDING STYLE:
- STREET
- STYLE:
- TECHNO
- MOUNTING STYLE:
- 2 HOLE
- TYPE:
- INSPECTION
$47.95 -
On Sale
BARNETT '07-'18 Big Twin Black/Clear Derby Cover 343-30-44013
BARNETT
MSRP: $246.48Now: $221.83Was: $246.48Monitor your clutch engagement in real-time with a clear view of your primary drive system—no guesswork, no surprises. This BARNETT derby cover replaces your stock unit with a durable polycarbonate window that withstands the rigors of riding while...11070437- SKU:
- 11070437
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SCORPION SERIES
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $246.48Now: $221.83Was: $246.48 -
On Sale
BARNETT '99-'06 Big Twin Black/Clear Derby Cover 343-30-44006
BARNETT
MSRP: $246.48Now: $221.83Was: $246.48A quality derby cover does more than protect your primary—it showcases your bike's mechanical heartbeat. The BARNETT Big Twin Derby Cover combines clean aesthetics with functional visibility, giving you an unobstructed view of your clutch operation while...11070439- SKU:
- 11070439
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- SCORPION SERIES
- MOUNTING STYLE:
- 5 HOLE
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $246.48Now: $221.83Was: $246.48 -
RSD Clarity Derby Cover - Contrast Cut 0177-2007-BM
RSD
$306.95The RSD Clarity Derby Cover gives you unobstructed visibility into your engine's internal operation, making it an essential upgrade for builders and enthusiasts who want to monitor their top-end performance in real time. CNC-machined from billet...09401063- SKU:
- 09401063
- Availability:
- Ships Same Business Day
- Weight:
- 1.77 LBS
- COLOR/FINISH:
- ALUMINUM
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- STYLE:
- CONTRAST CUT™
- UNITS:
- EACH
- MODEL:
- CLARITY
- TYPE:
- DERBY
$306.95 -
JOKER MACHINE Derby Cover - Lucky 7 921017L
JOKER MACHINE
$138.95A derby cover serves as both a protective barrier and a visual statement on your engine. The Joker Machine Lucky 7 design combines precision machining with authentic custom aesthetics, shielding your primary cover from road debris while maintaining the...DS375259- SKU:
- DS375259
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- STYLE:
- LUCKY-7
- TYPE:
- DERBY
$138.95Qty in Cart: 0Quantity:Price:$138.95Subtotal: -
BAKER DRIVETRAIN Dipstick 13002-56-A
BAKER DRIVETRAIN
$29.00Ends the problem of the OEM dipstick breaking off and going through your gears, Larger radius on the stem to the head for more strength, Polished with O-ring, Made in the U.S.A.11070690- SKU:
- 11070690
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- DIPSTICK
- TYPE:
- TRANSMISSION
- COLOR/FINISH:
- POLISHED
- UNITS:
- KIT
$29.00Qty in Cart: 0Quantity:Price:$29.00Subtotal: -
BARNETT '99-'06 Big Twin Chrome/Clear Derby Cover 343-30-43006
BARNETT
$302.10Designed to fit OEM primary covers on select Harley Davidson Big Twins, Features a clear 0.25" thick polycarbonate window to your clutch, Window is scratch and discoloration resistant and is sealed with an o-ring gasket, Derby cover gasket also included11070438- SKU:
- 11070438
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- SCORPION SERIES
- MOUNTING STYLE:
- 5 HOLE
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$302.10 -
FEULING OIL PUMP CORP. American Derby Cover - Black 9154
FEULING OIL PUMP CORP.
$159.95A primary cover sets the visual tone for your entire motorcycle—why settle for stock when you can command attention with precision-machined craftsmanship? The FEULING® Derby Cover transforms your bike's appearance with American-made billet construction,...11070614- SKU:
- 11070614
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- TYPE:
- DERBY
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- GLOSS
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$159.95 -
DRAG SPECIALTIES Outer Primary Cover - Chrome - Narrow Profile 77957
DRAG SPECIALTIES
$449.95The Drag Specialties Outer Primary Cover delivers a clean, finished appearance while protecting your primary drivetrain components from debris and weather exposure. Its narrow profile design integrates seamlessly with modern cruiser aesthetics without...11070536- SKU:
- 11070536
- Availability:
- Ships Same Business Day
- Weight:
- 6.45 LBS
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- STYLE:
- NARROW
- TYPE:
- OUTER PRIMARY
- UNITS:
- EACH
$449.95Qty in Cart: 0Quantity:Price:$449.95Subtotal: -
DRAG SPECIALTIES Outer Primary Cover - Black - Narrow Profile 77957B
DRAG SPECIALTIES
$458.95A properly finished primary cover protects your drivetrain components while maintaining the clean aesthetic your bike demands. The narrow profile design ensures a sleek appearance without sacrificing functionality or airflow around critical engine areas...11070537- SKU:
- 11070537
- Availability:
- Ships Same Business Day
- Weight:
- 6.15 LBS
- STYLE:
- NARROW
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- TYPE:
- OUTER PRIMARY
- UNITS:
- EACH
- COLOR/FINISH:
- SATIN BLACK
$458.95 -
DRAG SPECIALTIES Primary Cover - Chrome 63134
DRAG SPECIALTIES
$365.95A primary cover protects your engine's internal components from debris, moisture, and contaminants while maintaining a clean aesthetic on your motorcycle. Chrome finish provides corrosion resistance and a polished look that complements modern and classic...11070538- SKU:
- 11070538
- Availability:
- Ships Same Business Day
- Weight:
- 5.85 LBS
- TYPE:
- PRIMARY
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$365.95Qty in Cart: 0Quantity:Price:$365.95Subtotal: -
DRAG SPECIALTIES Primary Cover - Black 63134B
DRAG SPECIALTIES
$357.95A primary cover serves as the critical gateway between your engine's internals and the elements—protecting vital components from moisture, debris, and contamination while maintaining the clean aesthetic your bike demands. Drag Specialties' die-cast...11070539- SKU:
- 11070539
- Availability:
- Ships Same Business Day
- Weight:
- 5.60 LBS
- TYPE:
- PRIMARY
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$357.95 -
DRAG SPECIALTIES Split Skull Derby Cover - Chrome - 5-Hole 78043B2
DRAG SPECIALTIES
$71.95A quality derby cover protects your primary cover from road debris and weather while maintaining a polished appearance that matches your bike's aesthetic. The Split Skull design from Drag Specialties delivers that custom look without sacrificing...11070546- SKU:
- 11070546
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MODEL:
- SPLIT SKULL
- MOUNTING STYLE:
- 5 HOLE
- TYPE:
- DERBY
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$71.95 -
DRAG SPECIALTIES Split Skull Derby Cover - Black - 5-Hole 78043B
DRAG SPECIALTIES
$72.95A quality derby cover protects your primary cover from road debris, moisture, and UV damage while maintaining a cohesive aesthetic across your bike's drivetrain. The Drag Specialties Split Skull design delivers authentic styling that complements OEM and...11070547- SKU:
- 11070547
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MODEL:
- SPLIT SKULL
- MOUNTING STYLE:
- 5 HOLE
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- DERBY
$72.95
Buying Guide and FAQs
Buying Guide: Factors to Consider When Choosing Harley Bike Transmission Covers
- Compatibility: Ensure covers fit your Harley's model (e.g., Big Twin, Evo, Twin Cam, custom Softail/Dyna) and specifics like mounting holes (e.g., 8-hole for derby, 2-hole for inspection). Use the vehicle selector for year-specific matches to avoid fit issues.
- Type of Use: For aesthetic upgrades or custom looks, opt for derby/inspection covers; primary covers (inner/outer) suit protection and style in street riding; clutch actuators ideal for hydraulic systems in touring conditions.
- Components and Upgrades: Select derby covers with see-through windows or hidden fasteners, primary covers for narrow profiles, or actuators with banjo bolts. Focus on included hardware (e.g., bleeder screws) for complete installation.
- Brand and Quality: Choose PAUGHCO for chrome/black primary covers, Thrashin Supply Co for CNC-machined derby covers, Drag Specialties for narrow profile primaries, PRO-ONE PERF.MFG. for ball-milled/millennium derby covers, or TRASK for see-through assault covers. Prioritize cast/billet aluminum for durability and corrosion resistance.
- Installation and Cost: Most are bolt-on using OEM bolts; prices range from $28.95 for inspection covers to $317.95 for outer primaries—factor in finishes (chrome, black, gloss) and free shipping over $99 for value.
Frequently Asked Questions (FAQs)
- What Harley models do these transmission covers support? Covers support Big Twin, Evo, Twin Cam, and custom Softail/Dyna models—use the year/make/model filter for exact compatibility with stock H-D or aftermarket primaries.
- How do derby covers improve style? Designs like ball-milled, smooth, or see-through windows (e.g., TRASK with acrylic) add custom aesthetics with 8-hole mounting for easy swaps.
- What is typically included with clutch actuators? Actuators like PRO-ONE include 10mm banjo bolt, washers, bleeder screw—require separate 11/16" bore master cylinder and hydraulic line.
- What materials are used in covers? Primarily cast aluminum or billet aluminum with chrome, black (gloss/anodized), or raw finishes for style and durability.
- What if a cover doesn't fit my Harley? Verify mounting style (e.g., 8-hole derby, 2-hole inspection) and model before buying. Our returns policy allows exchanges or refunds if it doesn't match.
- Can I find related drivetrain parts? Yes—explore clutches, belts, sprockets, or full kits in the Harley drivetrain category to complement your transmission cover upgrade.
