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
-
PAUGHCO Inner Primary Cover - Chrome 752
PAUGHCO
$239.95The PAUGHCO Inner Primary Cover keeps your primary drivetrain protected from debris and contamination while maintaining a polished, factory-correct appearance. Whether you're running a stock setup or a high-performance build, this chrome cover shields...11070187- SKU:
- 11070187
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- INNER PRIMARY
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
PAUGHCO Outer Primary Cover 751
PAUGHCO
$314.95The PAUGHCO Outer Primary Cover 751 protects your primary drive system from debris, moisture, and contamination while maintaining a clean, factory-finished appearance. This cover is engineered to preserve primary component longevity and reduce...11070190- SKU:
- 11070190
- Availability:
- Ships Same Business Day
- Weight:
- 3.05 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- FEATURES:
- FOR USE WITH COMPENSATING SPROCKET
- RIDING STYLE:
- STREET
- TYPE:
- OUTER PRIMARY
- UNITS:
- EACH
$314.95 -
PAUGHCO Inner Primary Cover - Black B752
PAUGHCO
$251.95The PAUGHCO Inner Primary Cover B752 protects your primary drivetrain from contamination and heat while maintaining clean aesthetics on your build. This OEM-quality black cover integrates seamlessly with stock and custom primary assemblies, ensuring...11070191- SKU:
- 11070191
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- GLOSS
- RIDING STYLE:
- STREET
- TYPE:
- INNER PRIMARY
$251.95Qty in Cart: 0Quantity:Price:$251.95Subtotal: -
PAUGHCO Inner Primary Cover - Black B753E
PAUGHCO
$251.95The PAUGHCO Inner Primary Cover serves as both a protective barrier and a finished aesthetic element for your primary drivetrain. A quality inner primary cover shields critical components from debris and contamination while maintaining a clean,...11070192- SKU:
- 11070192
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- TYPE:
- INNER PRIMARY
- COLOR/FINISH:
- GLOSS
$251.95Qty in Cart: 0Quantity:Price:$251.95Subtotal: -
PAUGHCO Outer Primary Cover B750
PAUGHCO
$317.95The PAUGHCO Outer Primary Cover B750 protects your primary drive system from contamination and heat while maintaining clean aesthetics on your build. This CNC-precision cover ensures reliable performance by sealing critical drivetrain components against...11070193- SKU:
- 11070193
- Availability:
- Ships Same Business Day
- Weight:
- 3.06 LBS
- FEATURES:
- FOR USE WITHOUT COMPENSATING SPROCKET
- COLOR/FINISH:
- GLOSS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- TYPE:
- OUTER PRIMARY
- UNITS:
- EACH
$317.95 -
PAUGHCO Derby Cover B757
PAUGHCO
$69.95The PAUGHCO Derby Cover B757 delivers clean, finished aesthetics to your primary cover while maintaining stock compatibility with Harley-Davidson applications. Whether you're running an OEM setup or upgrading to PAUGHCO's outer primary covers, this derby...11070195- SKU:
- 11070195
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- TYPE:
- DERBY
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- GLOSS
- MOUNTING STYLE:
- 8 HOLE
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$69.95 -
PAUGHCO Inspection Cover B758
PAUGHCO
$32.95The PAUGHCO Inspection Cover B758 provides reliable access to your primary drive system while maintaining a clean, factory-correct appearance. Whether you're running stock Harley-Davidson components or upgraded PAUGHCO outer primary covers, this...11070196- SKU:
- 11070196
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MOUNTING STYLE:
- 2 HOLE
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- GLOSS
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- INSPECTION
$32.95 -
PAUGHCO Derby Cover 757
PAUGHCO
$69.95The PAUGHCO Derby Cover 757 delivers a clean, finished look to your primary cover while protecting internal components from dust and debris. Whether you're running stock Harley-Davidson internals or upgrading to a PAUGHCO outer primary cover, this derby...11070197- SKU:
- 11070197
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- MOUNTING STYLE:
- 8 HOLE
- PRODUCT NAME:
- COVER
- TYPE:
- DERBY
- UNITS:
- EACH
$69.95Qty in Cart: 0Quantity:Price:$69.95Subtotal: -
PAUGHCO Inspection Cover 758
PAUGHCO
$28.95Keep your primary drivetrain protected from contamination and mechanical damage with the PAUGHCO Inspection Cover 758. This purpose-built cover provides reliable access for routine maintenance while shielding critical components from dirt, debris, and...11070198- SKU:
- 11070198
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- MOUNTING STYLE:
- 2 HOLE
- TYPE:
- INSPECTION
$28.95Qty in Cart: 0Quantity:Price:$28.95Subtotal: -
PAUGHCO Outer Primary Cover 750
PAUGHCO
$314.95The PAUGHCO Outer Primary Cover 750 protects your primary drivetrain from contamination while maintaining proper oil circulation—essential for reliable performance during extended riding sessions. This domestically manufactured cover combines durability...11070189- SKU:
- 11070189
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- TYPE:
- OUTER PRIMARY
- FEATURES:
- FOR USE WITHOUT COMPENSATING SPROCKET
- UNITS:
- EACH
$314.95 -
PRO-ONE PERF.MFG. Derby Cover - Ball Milled - Big Twin 203860
PRO-ONE PERF.MFG.
$126.45A derby cover serves as both protection and visual statement on your Big Twin engine. Pro-One's billet aluminum construction resists impact and corrosion while the ball-milled finish delivers a refined aesthetic that complements serious builds. This is...DS375747- SKU:
- DS375747
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- MILLENNIUM
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- STYLE:
- BALL-MILLED
- TYPE:
- DERBY
$126.45 -
PRO-ONE PERF.MFG. Derby Cover - Millennium 203850B
PRO-ONE PERF.MFG.
$126.45A derby cover protects your engine's internal components from debris, moisture, and contamination while maintaining clean aesthetics on your build. Whether you're running high-RPM street applications or track-focused setups, a quality billet cover...09401066- SKU:
- 09401066
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- MATERIAL:
- BILLET ALUMINUM
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- STYLE:
- SMOOTH
- MODEL:
- MILLENNIUM
- RIDING STYLE:
- STREET
- TYPE:
- DERBY
$126.45Qty in Cart: 0Quantity:Price:$126.45Subtotal: -
PRO-ONE PERF.MFG. Derby Cover 203861B
PRO-ONE PERF.MFG.
$142.95A derby cover protects your engine's internal components from debris, moisture, and contamination while maintaining a clean, finished appearance on your crankcase. Whether you're running a high-revving engine on the track or keeping your build...11070626- SKU:
- 11070626
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- COVER
- PRODUCT NAME:
- DERBY COVER
- TYPE:
- DERBY
- UNITS:
- EACH
- MATERIAL:
- BILLET ALUMINUM
- STYLE:
- SMOOTH
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- MODEL:
- MILLENNIUM
$142.95 -
PRO-ONE PERF.MFG. Clutch Actuator - Black - Hydraulic 202240B
PRO-ONE PERF.MFG.
$252.95A responsive, precision-engineered clutch actuator is fundamental to smooth power delivery and driver control, especially in high-performance applications where consistency matters. The PRO-ONE PERF.MFG. Hydraulic Clutch Actuator delivers that...11070252- SKU:
- 11070252
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- TYPE:
- HYDRAULIC CLUTCH ACTUATOR
- RIDING STYLE:
- STREET
$252.95 -
TRASK COVER DERBY ASLT RAW TM-0042R
TRASK
$279.95A quality derby cover protects your engine's internal components from debris, moisture, and contamination while maintaining a clean, purposeful aesthetic. The TRASK raw finish offers a minimalist look that complements both stock and modified builds. This...11070686- SKU:
- 11070686
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
$279.95 -
TRASK Assault Derby Cover - Chrome TM-0041CH
TRASK
$279.95A derby cover does more than protect your engine—it's the first visual statement of your build's quality. The TRASK Assault Derby Cover combines precision CNC machining with a transparent acrylic window, letting you display internal engine components...11070638- SKU:
- 11070638
- Availability:
- Ships Same Business Day
- Weight:
- 2.76 LBS
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- COLOR/FINISH:
- CHROME
- MODEL:
- ASSAULT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$279.95 -
TRASK Assault Derby Cover - Raw TM-0041R
TRASK
$279.95A properly engineered derby cover protects your engine's internals from debris and moisture while maintaining the clean aesthetic of your build. The TRASK Assault Derby Cover delivers precision CNC-machined construction paired with a transparent acrylic...11070639- SKU:
- 11070639
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- MODEL:
- ASSAULT
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- RAW
$279.95 -
TRASK Assault Derby Cover - Gloss Black TM-0040BK
TRASK
$279.95A quality derby cover protects your engine's internal components from debris and contamination while maintaining a finished appearance in your engine bay. The TRASK Assault Derby Cover delivers precision-machined construction with practical visibility,...11070640- SKU:
- 11070640
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MODEL:
- ASSAULT
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- GLOSS BLACK
$279.95 -
TRASK Assault Derby Cover - Chrome TM-0040CH
TRASK
$279.95A derby cover serves as more than cosmetic—it protects your top-end components from debris, moisture, and contamination while maintaining engine bay aesthetics. The TRASK Assault Derby Cover combines precision machining with functional design, giving you...11070641- SKU:
- 11070641
- Availability:
- Ships Same Business Day
- Weight:
- 2.11 LBS
- COLOR/FINISH:
- CHROME
- MATERIAL:
- ALUMINUM
- MODEL:
- ASSAULT
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$279.95 -
TRASK Assault Derby Cover - Raw TM-0040R
TRASK
$279.95A quality derby cover protects your engine's internal components while maintaining the clean aesthetic your build demands. The TRASK Assault Derby Cover combines precision-machined construction with a transparent window, giving you real-time visibility...11070642- SKU:
- 11070642
- Availability:
- Ships Same Business Day
- Weight:
- 2.05 LBS
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- RAW
- MODEL:
- ASSAULT
$279.95
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.
