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
$239.95Made in the U.S.A.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
$239.95 -
PAUGHCO Outer Primary Cover 751
PAUGHCO
$314.95Made in the U.S.A.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
$251.95Made in the U.S.A.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
$251.95Made in the U.S.A.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
$317.95Made in the U.S.A.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
$69.95Fit stock H-D's as well as Paughco outer primary covers, Made in the U.S.A.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
$32.95Fit stock H-D's as well as Paughco outer primary covers, Made in the U.S.A.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
$69.95Fit stock H-D's as well as Paughco outer primary covers, Made in the U.S.A.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
$69.95 -
PAUGHCO Inspection Cover 758
PAUGHCO
$28.95Fit stock H-D's as well as Paughco outer primary covers, Made in the U.S.A.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
$314.95Made in the U.S.A.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 -
On Sale
PRO-ONE PERF.MFG. Derby Cover - Ball Milled - Big Twin 203860
PRO-ONE PERF.MFG.
MSRP: $126.45Now: $113.81Was: $126.45Billet aluminum coversDS375747- 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
MSRP: $126.45Now: $113.81Was: $126.45 -
On Sale
PRO-ONE PERF.MFG. Derby Cover - Millennium 203850B
PRO-ONE PERF.MFG.
MSRP: $126.45Now: $113.81Was: $126.45Billet aluminum covers09401066- 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
MSRP: $126.45Now: $113.81Was: $126.45 -
On Sale
PRO-ONE PERF.MFG. Derby Cover 203861B
PRO-ONE PERF.MFG.
MSRP: $142.95Now: $128.66Was: $142.955-hole derby cover11070626- 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
MSRP: $142.95Now: $128.66Was: $142.95Qty in Cart: 0Quantity:Price:MSRP: $142.95Now: $128.66Was: $142.95Subtotal: -
On Sale
PRO-ONE PERF.MFG. Clutch Actuator - Black - Hydraulic 202240B
PRO-ONE PERF.MFG.
MSRP: $252.95Now: $227.66Was: $252.95Crafted from billet aluminum with a chrome or black anodized finish, Installs with OEM bolts; 10mm banjo bolt, banjo washers and bleeder screw included, Requires the use of an 11/16" bore master cylinder (sold separately), Hydraulic line not included11070252- 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
MSRP: $252.95Now: $227.66Was: $252.95 -
TRASK COVER DERBY ASLT RAW TM-0042R
TRASK
$279.95TRASK COVER DERBY ASLT RAW11070686- SKU:
- 11070686
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
$279.95 -
TRASK Assault Derby Cover - Chrome TM-0041CH
TRASK
$279.95Billet machined T6061 aluminum with acrylic see-through window, Matches Assault series air cleaners and cam covers, Made in the U.S.A., Acrylic see-through window11070638- 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
$279.95Billet machined T6061 aluminum with acrylic see-through window, Matches Assault series air cleaners and cam covers, Made in the U.S.A., Acrylic see-through window11070639- 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
$279.95Billet machined T6061 aluminum with acrylic see through window, Matches Assault series air cleaners and cam covers, Made in the U.S.A., Acrylic see-through window11070640- 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
$279.95Billet machined T6061 aluminum with acrylic see through window, Matches Assault series air cleaners and cam covers, Made in the U.S.A., Acrylic see-through window11070641- 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
$279.95Billet machined T6061 aluminum with acrylic see through window, Matches Assault series air cleaners and cam covers, Made in the U.S.A., Acrylic see-through window11070642- 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.
