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
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COVINGTONS Derby Cover - Dimpled - 5-Hole - Black - Softail C1973-B
COVINGTONS
$191.95A quality derby cover protects your primary cover from road debris and moisture while maintaining a clean, finished appearance on your Softail. The Covington's dimpled design adds visual interest...11070697- SKU:
- 11070697
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
$191.95Qty in Cart: 0Quantity:Price:$191.95Subtotal: -
COVINGTONS Derby Cover - Dimpled - 5-Hole - Chrome - Softail C1973-C
COVINGTONS
$191.95A quality derby cover protects your primary cover from road debris and weather while adding a refined aesthetic to your Softail's engine bay. The dimpled design reduces light reflection for a...11070698- SKU:
- 11070698
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
$191.95 -
COVINGTONS Derby Cover - Diamondback - 5-Hole - Black - Twin Cam C3074-B
COVINGTONS
$216.95A derby cover protects your primary cover from road debris, moisture, and UV damage while maintaining a finished appearance on your engine. The Covington's Diamondback delivers precision CNC...11070701- SKU:
- 11070701
- Availability:
- Ships Same Business Day
- Weight:
- 2.02 LBS
$216.95 -
On Sale
Belt Drives Ltd Rear Drive Belt 139 Tooth 1 inch Harley-Davidson Touring 2015-2022 PCC-139-1
BELT DRIVES LTD.
MSRP: $320.77Now: $304.73Was: $320.77Belt degradation is one of the most overlooked failure points in Harley-Davidson touring powertrains—a worn or failing belt doesn't just reduce power transfer efficiency, it risks catastrophic...12040245- SKU:
- 12040245
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
MSRP: $320.77Now: $304.73Was: $320.77 -
On Sale
LA CHOPPERS County Line Derby Cover Derby Cover - Twin Cam - Raw LA-P106-00
LA CHOPPERS
MSRP: $124.99Now: $112.00Was: $124.99Your Twin Cam engine deserves a derby cover that matches your bike's aesthetic while delivering clean, precision engineering. The LA CHOPPERS County Line Derby Cover replaces a stock component with a...11070710- SKU:
- 11070710
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
MSRP: $124.99Now: $112.00Was: $124.99 -
On Sale
LA CHOPPERS County Line Derby Cover Derby Cover - Twin Cam - Black LA-P106-00B
LA CHOPPERS
MSRP: $162.99Now: $147.00Was: $162.99A worn or stock derby cover compromises your Twin Cam's visual impact and leaves performance details hidden. The LA CHOPPERS County Line Derby Cover delivers the precision fit and refined aesthetics...11070711- SKU:
- 11070711
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
MSRP: $162.99Now: $147.00Was: $162.99 -
On Sale
LA CHOPPERS County Line Derby Cover Derby Cover - M8 FL - Raw LA-P106-01
LA CHOPPERS
MSRP: $124.99Now: $112.00Was: $124.99The stock derby cover doesn't have to limit your aesthetic. This LA CHOPPERS County Line cover replaces the factory unit with precision-machined billet aluminum that coordinates seamlessly with the...11070713- SKU:
- 11070713
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
MSRP: $124.99Now: $112.00Was: $124.99 -
On Sale
LA CHOPPERS County Line Derby Cover Derby Cover - M8 FL - Black LA-P106-01B
LA CHOPPERS
MSRP: $162.99Now: $147.00Was: $162.99The stock derby cover on your M8 FL is functional, but it lacks the refined aesthetics and precision engineering your bike deserves. LA CHOPPERS' County Line Derby Cover replaces it with a billet...11070714- SKU:
- 11070714
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
MSRP: $162.99Now: $147.00Was: $162.99 -
On Sale
LA CHOPPERS County Line Derby Cover Derby Cover - M8 FL - Chrome LA-P106-01C
LA CHOPPERS
MSRP: $194.99Now: $175.00Was: $194.99A stock derby cover draws attention for all the wrong reasons. This LA Choppers County Line Derby Cover replaces that plastic piece with precision-machined billet aluminum that delivers a refined,...11070715- SKU:
- 11070715
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
MSRP: $194.99Now: $175.00Was: $194.99 -
On Sale
LA CHOPPERS County Line Derby Cover Derby Cover - M8 Softail - Raw LA-P106-02
LA CHOPPERS
MSRP: $124.99Now: $112.00Was: $124.99The stock derby cover on your M8 Softail is functional, but it's also generic. The LA CHOPPERS County Line Derby Cover replaces it with a precision-machined billet aluminum alternative that elevates...11070716- SKU:
- 11070716
- Availability:
- Ships Same Business Day
- Weight:
- 1.08 LBS
MSRP: $124.99Now: $112.00Was: $124.99 -
On Sale
LA CHOPPERS County Line Derby Cover Derby Cover - M8 - Softail - Chrome LA-P106-02C
LA CHOPPERS
MSRP: $164.99Now: $148.00Was: $164.99A quality derby cover protects your M8 Softail's primary cover from road debris and moisture while giving your bike a finished, premium appearance. The LA CHOPPERS County Line Derby Cover upgrades...11070718- SKU:
- 11070718
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
MSRP: $164.99Now: $148.00Was: $164.99Qty in Cart: 0Quantity:Price:MSRP: $164.99Now: $148.00Was: $164.99Subtotal: -
KODLIN USA Upper Belt Guard - Black - Softail K47309
KODLIN USA
$119.99The KODLIN USA Upper Belt Guard protects your Softail's primary drivetrain from road debris, weather exposure, and accidental contact—critical for maintaining belt longevity and preserving your...12020183- SKU:
- 12020183
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$119.99 -
On Sale
BAKER DRIVETRAIN 5-Speed Countershaft Bearing - Closed End BK2526
BAKER DRIVETRAIN
MSRP: $22.99Now: $21.84Was: $22.99A worn or failing countershaft bearing compromises your 5-speed transmission's structural integrity and accelerates wear across your entire drivetrain. The Baker Drivetrain BK2526 is a...11060238- SKU:
- 11060238
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
MSRP: $22.99Now: $21.84Was: $22.99 -
On Sale
BAKER DRIVETRAIN 5-Speed Mainshaft/Countershaft Split Cage Needle Bearing 8876A
BAKER DRIVETRAIN
MSRP: $12.99Now: $12.34Was: $12.99Worn needle bearings in your 5-speed Big Twin transmission can cause shift hesitation, increased drivetrain noise, and premature gear damage—all signs it's time for a replacement. The Baker...11060239- SKU:
- 11060239
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
MSRP: $12.99Now: $12.34Was: $12.99 -
On Sale
BAKER DRIVETRAIN 5-Speed Main Drive Gear Needle Bearing - Open End HK2520
BAKER DRIVETRAIN
MSRP: $12.99Now: $12.34Was: $12.99The Baker Drivetrain HK2520 needle bearing is a critical wear component in your 5-speed Big Twin transmission—one that directly impacts shift quality, load distribution, and overall drivetrain...11060240- SKU:
- 11060240
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
MSRP: $12.99Now: $12.34Was: $12.99 -
On Sale
BAKER DRIVETRAIN 5-Speed Main Drive Gear Roller Ball Bearing 6209
BAKER DRIVETRAIN
MSRP: $29.99Now: $28.49Was: $29.99If your 5-Speed Big Twin's drivetrain is showing signs of wear—rough engagement, excessive noise, or notchy shifts—a worn main drive gear bearing is often the culprit. Baker's 6209 roller ball...11060241- SKU:
- 11060241
- Availability:
- Ships Same Business Day
- Weight:
- 1.08 LBS
MSRP: $29.99Now: $28.49Was: $29.99 -
On Sale
BAKER DRIVETRAIN 5-Speed Main Drive Gear Seal 12067B
BAKER DRIVETRAIN
MSRP: $19.99Now: $18.99Was: $19.99A compromised main drive gear seal is one of the fastest ways to lose fluid pressure and contaminate your transmission oil in a 5-speed Big Twin. This OEM-specification Baker Drivetrain replacement...11060242- SKU:
- 11060242
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
MSRP: $19.99Now: $18.99Was: $19.99 -
On Sale
BAKER DRIVETRAIN 5-Speed Transmission Door Bearing 6304
BAKER DRIVETRAIN
MSRP: $19.99Now: $18.99Was: $19.99Transmission bearing wear is one of the most common culprits behind rough shifts, noise, and premature drivetrain failure in 5-speed Big Twin engines. The BAKER DRIVETRAIN 6304 is a direct...11060243- SKU:
- 11060243
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
MSRP: $19.99Now: $18.99Was: $19.99 -
On Sale
BAKER DRIVETRAIN Transmission Door Assembly - Polished 48902-6
BAKER DRIVETRAIN
MSRP: $495.00Now: $470.25Was: $495.00Stock transmission doors become a bottleneck when you're pushing serious power through your drivetrain. The BAKER DRIVETRAIN Transmission Door Assembly upgrades your bearings with 28% wider geometry...11070719- SKU:
- 11070719
- Availability:
- Ships Same Business Day
- Weight:
- 5.06 LBS
MSRP: $495.00Now: $470.25Was: $495.00 -
On Sale
BAKER DRIVETRAIN Transmission Door Assembly - Wrinkle Black 48403-6
BAKER DRIVETRAIN
MSRP: $395.00Now: $375.25Was: $395.00Stock transmission doors are a common weak point in high-output engine builds, introducing unnecessary parasitic losses and inconsistent clutch feel. The BAKER DRIVETRAIN Transmission Door Assembly...11070720- SKU:
- 11070720
- Availability:
- Ships Same Business Day
- Weight:
- 5.00 LBS
MSRP: $395.00Now: $375.25Was: $395.00
