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!
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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 without sacrificing durability, and the CNC-machined...11070697- SKU:
- 11070697
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
$191.95 -
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 sophisticated look that complements modern and classic builds...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 machining and a distinctive aesthetic that sets your Twin Cam...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: $237.56Was: $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 drivetrain failure on the road. The Belt Drives Ltd 139 Tooth...12040245- SKU:
- 12040245
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
MSRP: $320.77Now: $237.56Was: $320.77 -
LA CHOPPERS County Line Derby Cover Derby Cover - Twin Cam - Raw LA-P106-00
LA CHOPPERS
$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 purposeful billet alternative that integrates...11070710- SKU:
- 11070710
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
$124.99 -
LA CHOPPERS County Line Derby Cover Derby Cover - Twin Cam - Black LA-P106-00B
LA CHOPPERS
$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 your engine deserves, with billet construction that...11070711- SKU:
- 11070711
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
$162.99 -
LA CHOPPERS County Line Derby Cover Derby Cover - M8 FL - Raw LA-P106-01
LA CHOPPERS
$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 rest of the County Line lineup while delivering a...11070713- SKU:
- 11070713
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
$124.99 -
LA CHOPPERS County Line Derby Cover Derby Cover - M8 FL - Black LA-P106-01B
LA CHOPPERS
$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 aluminum alternative that delivers a clean, modern look...11070714- SKU:
- 11070714
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
$162.99 -
LA CHOPPERS County Line Derby Cover Derby Cover - M8 FL - Chrome LA-P106-01C
LA CHOPPERS
$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, low-profile aesthetic while maintaining the durability...11070715- SKU:
- 11070715
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
$194.99 -
LA CHOPPERS County Line Derby Cover Derby Cover - M8 Softail - Raw LA-P106-02
LA CHOPPERS
$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 your engine's visual presence while maintaining the...11070716- SKU:
- 11070716
- Availability:
- Ships Same Business Day
- Weight:
- 1.08 LBS
$124.99 -
LA CHOPPERS County Line Derby Cover Derby Cover - M8 - Softail - Chrome LA-P106-02C
LA CHOPPERS
$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 your engine's visual impact with precision-machined...11070718- SKU:
- 11070718
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$164.99 -
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 bike's appearance. A steel construction with powder-coat...12020183- SKU:
- 12020183
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$119.99 -
BAKER DRIVETRAIN 5-Speed Countershaft Bearing - Closed End BK2526
BAKER DRIVETRAIN
$10.99A 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 precision-engineered replacement that restores proper load...11060238- SKU:
- 11060238
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
$10.99 -
BAKER DRIVETRAIN 5-Speed Mainshaft/Countershaft Split Cage Needle Bearing 8876A
BAKER DRIVETRAIN
$8.99Worn 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 Drivetrain 8876A is a direct OEM-equivalent bearing engineered...11060239- SKU:
- 11060239
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
$8.99 -
BAKER DRIVETRAIN 5-Speed Main Drive Gear Needle Bearing - Open End HK2520
BAKER DRIVETRAIN
$8.99The 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 longevity. When this bearing degrades, you'll experience...11060240- SKU:
- 11060240
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
$8.99 -
BAKER DRIVETRAIN 5-Speed Main Drive Gear Roller Ball Bearing 6209
BAKER DRIVETRAIN
$21.99If 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 bearing restores smooth power delivery and precise gear...11060241- SKU:
- 11060241
- Availability:
- Ships Same Business Day
- Weight:
- 1.08 LBS
$21.99 -
BAKER DRIVETRAIN 5-Speed Main Drive Gear Seal 12067B
BAKER DRIVETRAIN
$8.99A 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 seal restores the critical barrier between your primary...11060242- SKU:
- 11060242
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$8.99 -
BAKER DRIVETRAIN 5-Speed Transmission Door Bearing 6304
BAKER DRIVETRAIN
$14.99Transmission 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 replacement bearing engineered to restore smooth operation and...11060243- SKU:
- 11060243
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$14.99 -
BAKER DRIVETRAIN Transmission Door Assembly - Polished 48902-6
BAKER DRIVETRAIN
$395.00Stock 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 and eliminates phantom clutch lever movement, giving...11070719- SKU:
- 11070719
- Availability:
- Ships Same Business Day
- Weight:
- 5.06 LBS
$395.00 -
BAKER DRIVETRAIN Transmission Door Assembly - Wrinkle Black 48403-6
BAKER DRIVETRAIN
$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 eliminates these issues with precision-engineered...11070720- SKU:
- 11070720
- Availability:
- Ships Same Business Day
- Weight:
- 5.00 LBS
$395.00
