Harley Drivetrain
Harley Bike Drivetrain Parts at JJ Motorsports
Upgrade your Harley's drivetrain for smoother power delivery and reliability with components from JJ Motorsports. Our selection includes transmission mounting plates, offset sprockets, mechanical reverse kits, starter spacers, pulley spacers, and primary covers designed for heavy-duty use, easy bolt-in installation, and enhanced performance. Compatible with Big Twins, Softail, Dyna, and more, these parts feature chrome finishes, billet aluminum, and CNC-machined steel for corrosion resistance and custom fitment.
Shop trusted brands like Paughco for primary covers and PBI for sprockets. Explore related categories such as Harley engine parts for rebuilds or Harley suspension for balanced setups.
Top Harley Drivetrain Products
- PAUGHCO Transmission Plate - OE Type 4-Speed 218 – Heavy-duty steel for Big Twins with 4-speed transmissions.
- PBI Offset Transmission Sprocket - 22-Tooth 281-22 – CNC-machined chromoly steel with 0.750" offset for 530 chains.
- MOTOR TRIKE Mechanical Reverse Kit MTTR-0025 – Lightweight aluminum with electronic cut-off for easy parking.
- TERRY COMPONENTS Starter Spacer 779000 – Billet aluminum, 1-1/2" thick for longer starters.
- PINGEL Rear Pulley Spacer 62051 – Billet aluminum for wider tires up to 142mm.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
On Sale
ARLEN NESS Derby Cover 700-006
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95A derby cover does more than protect your primary cover from road debris and weather—it defines your bike's aesthetic while safeguarding critical engine components. The ARLEN NESS Derby Cover 700-006 delivers precision machining and clean design without...11070651- SKU:
- 11070651
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- 10 GAUGE
- MOUNTING STYLE:
- 5 HOLE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- RED ANODIZED
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
MSRP: $169.95Now: $154.65Was: $169.95 -
On Sale
ARLEN NESS Derby Cover 700-007
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95A quality derby cover protects your engine's internal components from dirt, debris, and moisture while adding a finished aesthetic to your bike's top end. The ARLEN NESS Derby Cover 700-007 delivers both functionality and style with precision machining...11070652- SKU:
- 11070652
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- COLOR/FINISH:
- TITANIUM ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- 10 GAUGE
- MOUNTING STYLE:
- 5 HOLE
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $169.95Now: $154.65Was: $169.95 -
On Sale
ARLEN NESS Derby Cover 700-019
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95Machined from 6061-T6 billet aluminum, Chrome hardware and gasket included, Matching point and inspection covers available separately, Sold each11070654- SKU:
- 11070654
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- COLOR/FINISH:
- BLUE ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- STYLE:
- 10 GAUGE
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $169.95Now: $154.65Was: $169.95 -
On Sale
ARLEN NESS Derby Cover 700-021
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95A quality derby cover protects your primary cover from road debris and UV exposure while maintaining the clean aesthetic of your engine bay. The ARLEN NESS 700-021 delivers precision engineering with CNC-machined construction, ensuring a factory-fit...11070656- SKU:
- 11070656
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- COLOR/FINISH:
- ORANGE ANODIZED
- STYLE:
- 10 GAUGE
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
MSRP: $169.95Now: $154.65Was: $169.95 -
On Sale
ARLEN NESS Derby Cover 700-022
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95A quality derby cover protects your primary case from moisture, debris, and road contaminants while maintaining clean aesthetics on your machine. The ARLEN NESS 700-022 delivers precision-machined construction with a finished appearance that complements...11070657- SKU:
- 11070657
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- COLOR/FINISH:
- RED ANODIZED
- RIDING STYLE:
- STREET
- STYLE:
- 10 GAUGE
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
MSRP: $169.95Now: $154.65Was: $169.95 -
On Sale
ARLEN NESS Derby Cover 700-017
ARLEN NESS
MSRP: $159.95Now: $145.55Was: $159.95A quality derby cover protects your engine's internal components from dirt, debris, and moisture while maintaining a clean aesthetic that complements your bike's finish. The ARLEN NESS Derby Cover 700-017 delivers precision engineering with CNC-machined...11070666- SKU:
- 11070666
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
- PRODUCT NAME:
- DERBY COVER
- STYLE:
- 10 GAUGE
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- RIDING STYLE:
- STREET
MSRP: $159.95Now: $145.55Was: $159.95 -
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 -
On Sale
ARLEN NESS Derby Cover 700-016
ARLEN NESS
MSRP: $159.95Now: $145.55Was: $159.95Machined from 6061-T6 billet aluminum, Chrome hardware and gasket included, Matching point and inspection covers available separately, Sold each11070653- SKU:
- 11070653
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- PRODUCT NAME:
- DERBY COVER
- COLOR/FINISH:
- BLACK ANODIZED
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- STYLE:
- 10 GAUGE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $159.95Now: $145.55Was: $159.95Qty in Cart: 0Quantity:Price:MSRP: $159.95Now: $145.55Was: $159.95Subtotal: -
On Sale
ARLEN NESS Derby Cover 700-020
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95A derby cover serves as both a functional and aesthetic component, protecting your primary drive system while presenting a finished appearance on your engine. The ARLEN NESS Derby Cover 700-020 combines precision CNC machining with durable billet...11070655- SKU:
- 11070655
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- PRODUCT NAME:
- DERBY COVER
- STYLE:
- 10 GAUGE
- UNITS:
- EACH
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- GOLD ANODIZED
MSRP: $169.95Now: $154.65Was: $169.95 -
On Sale
ARLEN NESS Derby Cover 700-023
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95A quality derby cover protects your primary cover from road debris and weather while maintaining a clean, finished look on your engine case. The ARLEN NESS Derby Cover 700-023 is precision-machined from 6061-T6 billet aluminum, offering durability...11070658- SKU:
- 11070658
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- COLOR/FINISH:
- TITANIUM ANODIZED
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- STYLE:
- 10 GAUGE
MSRP: $169.95Now: $154.65Was: $169.95 -
On Sale
ARLEN NESS Derby Cover - Black 700-002
ARLEN NESS
MSRP: $159.95Now: $145.55Was: $159.95A quality derby cover protects your engine's internal components from contamination while establishing a clean, finished look for your motorcycle's top end. The Arlen Ness Derby Cover combines precision machining with durable materials to deliver...11070663- SKU:
- 11070663
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- MODEL:
- 10 GAUGE
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- SILVER
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- COLOR/FINISH:
- BLACK ANODIZED
MSRP: $159.95Now: $145.55Was: $159.95 -
On Sale
ARLEN NESS Derby Cover - Chrome 700-001
ARLEN NESS
MSRP: $159.95Now: $145.55Was: $159.95The ARLEN NESS Derby Cover delivers the refined aesthetic and durability that separates a well-maintained engine from a neglected one. Machined from aerospace-grade 6061-T6 billet aluminum, this cover resists corrosion while maintaining the precision fit...11070664- SKU:
- 11070664
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- MODEL:
- 10 GAUGE
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
MSRP: $159.95Now: $145.55Was: $159.95 -
On Sale
ARLEN NESS Derby Cover 700-018
ARLEN NESS
MSRP: $169.95Now: $154.65Was: $169.95A quality derby cover protects your engine's internal components from dirt, debris, and moisture while maintaining a clean, finished appearance on your motorcycle. The Arlen Ness 700-018 delivers both durability and style with precision machining and...11070665- SKU:
- 11070665
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- MOUNTING STYLE:
- 5 HOLE
- COLOR/FINISH:
- BLACK ANODIZED
- STYLE:
- 10 GAUGE
MSRP: $169.95Now: $154.65Was: $169.95 -
BAKER DRIVETRAIN Direct Drive 6-Speed DD6-411S-02
BAKER DRIVETRAIN
$3,195.00Fits into existing 5-speed cases; lowers the rpm at cruising speeds, Includes a polished trap door, 6-speed gear set (3.24:1 1st gear/.86:1 6th gear), 28-tooth motor sprocket, longer primary chain, adjusting shoe, fixed spindle-shift drum and...11030048- SKU:
- 11030048
- Availability:
- Ships Same Business Day
- Weight:
- 30.85 LBS
- MODEL:
- DD6
- RIDING STYLE:
- STREET
- STYLE:
- DIRECT DRIVE
- FIRST GEAR RATIO:
- 3.24:1
- PRODUCT NAME:
- GEAR SET
- TRANSMISSION TYPE:
- 6 SPEED
- UNITS:
- KIT
- SIXTH GEAR RATIO:
- 0.86:1
- TYPE:
- TRANSMISSION
$3,195.00 -
BAKER DRIVETRAIN Direct Drive 6-Speed DD6-411-02
BAKER DRIVETRAIN
$3,195.00Fits into existing 5-speed cases; lowers the rpm at cruising speeds, Includes a polished trap door, 6-speed gear set (3.24:1 1st gear/.86:1 6th gear), 28-tooth motor sprocket, longer primary chain, adjusting shoe, fixed spindle-shift drum and...11030049- SKU:
- 11030049
- Availability:
- Ships Same Business Day
- Weight:
- 32.30 LBS
- MODEL:
- DD6
- RIDING STYLE:
- STREET
- FIRST GEAR RATIO:
- 3.24:1
- TRANSMISSION TYPE:
- 6 SPEED
- SIXTH GEAR RATIO:
- 0.86:1
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- GEAR SET
- STYLE:
- DIRECT DRIVE
- UNITS:
- KIT
$3,195.00 -
BARNETT Scorpion Clutch 608-30-10011
BARNETT
$720.24Greatly increases clutch capacity, Provides smoother shifting, more progressive engagement, Multiple spring pressure options, Includes steel hub, billet pressure plate, clutch plates, and coil springs, Designed to fit the stock type basket, Ideal for...11300205- SKU:
- 11300205
- Availability:
- Ships Same Business Day
- Weight:
- 9.80 LBS
- UNITS:
- KIT
- COLOR/FINISH:
- ORANGE
- PRODUCT NAME:
- CLUTCH ASSEMBLY
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- MODEL:
- SCORPION
$720.24
