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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Jims 6-Speed Overdrive Super Kit for 2001-2006 Harley-Davidson Touring Softail Dyna 8085L
JIMS
$3,198.20If you're running a 5-speed Harley Touring, Softail, or Dyna, you're losing efficiency on the highway and putting unnecessary strain on your drivetrain. The JIMS 6-Speed Overdrive Super Kit converts your transmission into a modern 6-speed system that...11030009- SKU:
- 11030009
- Availability:
- Ships Same Business Day
- Weight:
- 27.25 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GEAR SET
- RIDING STYLE:
- STREET
- STYLE:
- CLOSE RATIO
- FIRST GEAR RATIO:
- 2.94:1
- SIXTH GEAR RATIO:
- 0.86:1
- STYLE:
- OVERDRIVE
- TRANSMISSION TYPE:
- 6 SPEED
$3,198.20 -
Jims Fat 5 5-Speed Overdrive Super Kit 8273 for 1990-2000 Harley-Davidson FLHR Road King
JIMS
$3,921.85If you're running a 1990-2000 FLHR Road King and tired of highway RPMs eating into fuel economy, the JIMS Fat 5 5-Speed Overdrive Super Kit delivers real-world efficiency gains through a proven .886:1 overdrive ratio. This transmission upgrade bolts into...11030010- SKU:
- 11030010
- Availability:
- Ships Same Business Day
- Weight:
- 31.05 LBS
- FIFTH GEAR RATIO:
- 0.886:1
- RIDING STYLE:
- STREET
- STYLE:
- CUSTOM REPLACEMENT
- THIRD GEAR RATIO:
- 1.31:1
- FIRST GEAR RATIO:
- 2.91:1
- PRODUCT NAME:
- TRANSMISSION KIT
- SECOND GEAR RATIO:
- 1.93:1
- TRANSMISSION TYPE:
- 5 SPEED
- MODEL:
- FAT 5
- TYPE:
- GEAR SET
- UNITS:
- KIT
- FOURTH GEAR RATIO:
- 1.00:1
- STYLE:
- OVERDRIVE
$3,921.85 -
JIMS Mega Nut 1993-2006 Harley-Davidson Softail Springer FXSTS 1708
JIMS
$125.65A properly secured crankshaft pulley is fundamental to reliable engine operation—any movement or slippage directly compromises ignition timing and accessory drive efficiency. The JIMS Mega Nut delivers precision-machined clamping geometry that locks your...DS194003- SKU:
- DS194003
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- COLOR/FINISH:
- BLACK
- TYPE:
- PULLEY
- PRODUCT NAME:
- NUT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$125.65 -
Jims Transmission Sprocket Spacer for Harley-Davidson Softail 1986-1994 33334-85
JIMS
$53.25A worn or improperly fitted transmission sprocket spacer accelerates seal degradation and can introduce play into your drivetrain—leading to premature failures and costly rebuilds. The JIMS Transmission Sprocket Spacer 33334-85 maintains precise...DS197053- SKU:
- DS197053
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- LENGTH:
- 0.850'
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- TRANSMISSION SPROCKET SPACER
- TRANSMISSION TYPE:
- 5 SPEED
$53.25Qty in Cart: 0Quantity:Price:$53.25Subtotal: -
Jims Transmission Door Bearings for Harley-Davidson 1993-1998 Dyna Low Rider FXDL 8998K
JIMS
$39.05Transmission door bearings are critical wear items on your Dyna Low Rider—neglecting them leads to increased friction, noise, and eventual drivetrain damage. The JIMS 8998K is a U.S.-manufactured replacement that restores smooth operation and extends the...DS197063- SKU:
- DS197063
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- TRANSMISSION TYPE:
- 5 SPEED
- UNITS:
- 2 PACK
- PRODUCT NAME:
- BEARING
- TYPE:
- TRAP DOOR
$39.05 -
Jims Transmission Main Bearing Race for Harley-Davidson FLH 1965-1977 35125-37
JIMS
$112.50A worn or damaged mainshaft bearing race compromises transmission smoothness and accelerates wear on adjacent components, leading to costly rebuilds. The JIMS 35125-37 delivers OEM-grade precision fit and durability, restoring the tight tolerances your...DS195016- SKU:
- DS195016
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- BEARING RACE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- MAIN BEARING
$112.50 -
Jims 5-Speed Transmission Rebuild Kit 1984-1990 1020
JIMS
$409.40Transmission wear and internal degradation rob your bike of smooth shifts and reliable power delivery. The JIMS 5-Speed Rebuild Kit 1020 gives you a complete, factory-spec solution to restore your transmission to original performance without the cost and...DS325780- SKU:
- DS325780
- Availability:
- Ships Same Business Day
- Weight:
- 2.44 LBS
- RIDING STYLE:
- STREET
- TRANSMISSION TYPE:
- 5 SPEED
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
$409.40 -
Jims 6-Speed Transmission Rebuild Kit for Harley-Davidson Touring Models 1990-2006 1060
JIMS
$360.40If your Harley-Davidson touring transmission is showing signs of wear—slipping gears, rough shifts, or fluid leaks—a rebuild is the most cost-effective way to restore reliability without replacing the entire unit. The JIMS 1060 kit supplies all the...11040008- SKU:
- 11040008
- Availability:
- Ships Same Business Day
- Weight:
- 3.30 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TRANSMISSION TYPE:
- 6 SPEED
$360.40 -
EASTERN MOTORCYCLE PARTS Oil Deflectors A-33429-39
EASTERN MOTORCYCLE PARTS
$17.50Oil deflectors are essential for maintaining proper crankcase ventilation and preventing oil accumulation in critical engine areas. The EASTERN MOTORCYCLE PARTS A-33429-39 directs blow-by gases efficiently while keeping oil where it belongs—in your pan,...11120036- SKU:
- 11120036
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- PRODUCT NAME:
- OIL DEFLECTOR PLATE
$17.50 -
EASTERN MOTORCYCLE PARTS Ratchet Plate Rivets A-8216
EASTERN MOTORCYCLE PARTS
$2.95Ratchet plate rivets are critical fasteners in motorcycle assembly, providing secure, permanent connections that withstand high vibration and stress cycles. Eastern Motorcycle Parts' A-8216 rivets deliver the reliable hold your build demands, whether...11120041- SKU:
- 11120041
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- RIVET
- TYPE:
- KICKSTART RATCHET PLATE
- UNITS:
- 12 PACK
- RIDING STYLE:
- STREET
$2.95 -
EASTERN MOTORCYCLE PARTS Shifter Shaft - 34628-75 A-34628-75
EASTERN MOTORCYCLE PARTS
$37.95A worn or damaged shifter shaft compromises your bike's reliability and shifts, turning every gear change into a gamble. This Eastern Motorcycle Parts replacement restores precise engagement and smooth operation, getting you back to confident riding...11060087- SKU:
- 11060087
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- SHIFT LEVER SHAFT
- RIDING STYLE:
- STREET
- STYLE:
- OEM REPLACEMENT
$37.95 -
EASTERN MOTORCYCLE PARTS Sprocket Shaft Nut - 35047-71A A-35047-71A
EASTERN MOTORCYCLE PARTS
$14.95A worn or damaged sprocket shaft nut compromises your entire drivetrain's integrity, leading to slippage, noise, and potential catastrophic failure. This OEM-quality replacement from Eastern Motorcycle Parts ensures secure fastening and reliable power...11060089- SKU:
- 11060089
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- MAINSHAFT SPROCKET NUT
$14.95 -
EASTERN MOTORCYCLE PARTS Clutch Hub Nuts A-37495-91
EASTERN MOTORCYCLE PARTS
$16.95A secure clutch hub nut is foundational to reliable drivetrain performance—improper fastening leads to slippage, noise, and catastrophic transmission failure. This Eastern Motorcycle Parts fastener delivers the precision fit and holding strength your...11060091- SKU:
- 11060091
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- NUT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- TYPE:
- CLUTCH HUB
$16.95 -
EASTERN MOTORCYCLE PARTS Bearing - 8970 A-8970
EASTERN MOTORCYCLE PARTS
$35.95Worn or failing bearings compromise handling precision and create dangerous play in critical chassis components. The Eastern Motorcycle Parts A-8970 bearing restores original equipment performance and reliability, ensuring smooth operation under...11060092- SKU:
- 11060092
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING
- STYLE:
- OEM REPLACEMENT
- TYPE:
- COUNTERSHAFT
- UNITS:
- EACH
$35.95 -
EASTERN MOTORCYCLE PARTS Transmission Mainshaft Bearing 44-0520
EASTERN MOTORCYCLE PARTS
$110.95A worn or failing transmission mainshaft bearing directly compromises shift quality, generates noise, and can lead to catastrophic transmission failure if left unchecked. The EASTERN MOTORCYCLE PARTS 44-0520 is a precision-engineered replacement that...11060232- SKU:
- 11060232
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING
- UNITS:
- EACH
$110.95 -
EASTERN MOTORCYCLE PARTS Drain Plug A-60348-65B
EASTERN MOTORCYCLE PARTS
$12.95A quality drain plug is fundamental to proper engine maintenance—it's your first line of defense against metal contamination and sludge buildup that compromises performance. This EASTERN MOTORCYCLE PARTS drain plug delivers reliable sealing and corrosion...11050091- SKU:
- 11050091
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- MAGNETIC
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- DRAIN PLUG
- UNITS:
- EACH
- COLOR/FINISH:
- ZINC
$12.95 -
EASTERN MOTORCYCLE PARTS Shifter Fork Shims - 0.007" A-6750
EASTERN MOTORCYCLE PARTS
$6.70Precise shifter fork clearance is critical to maintaining smooth, reliable gear engagement under racing conditions. These OEM-spec shims compensate for wear and manufacturing tolerances in your transmission, eliminating sloppy shifts and potential fork...11060021- SKU:
- 11060021
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- TYPE:
- SHIFTER FORK
- PRODUCT NAME:
- SHIM
- TRANSMISSION TYPE:
- 4 SPEED
- UNITS:
- 10 PACK
$6.70 -
EASTERN MOTORCYCLE PARTS Shifter Fork Shims - 0.015" A-6752
EASTERN MOTORCYCLE PARTS
$6.70Precise shifter fork alignment is critical to smooth, reliable gear engagement and longevity of your transmission. These Eastern Motorcycle Parts shims compensate for wear, manufacturing tolerances, and modifications—ensuring your shifter forks sit...11060022- SKU:
- 11060022
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- TRANSMISSION TYPE:
- 4 SPEED
- TYPE:
- SHIFTER FORK
$6.70 -
EASTERN MOTORCYCLE PARTS Shifter Fork Thrust Washers A-6754
EASTERN MOTORCYCLE PARTS
$13.50Shifter fork thrust washers are critical components that manage lateral movement and reduce wear on your transmission's shift mechanism. A worn or missing washer forces your shifter forks to bear excessive side loads, leading to sloppy shifting, missed...11060026- SKU:
- 11060026
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TRANSMISSION TYPE:
- 4 SPEED
- TYPE:
- SHIFTER FORK
- PRODUCT NAME:
- THRUST WASHER
- RIDING STYLE:
- STREET
$13.50 -
EASTERN MOTORCYCLE PARTS Access Door A-35087-99A
EASTERN MOTORCYCLE PARTS
$16.10Access doors are critical wear components that require OEM-spec replacements to maintain proper sealing, weather protection, and structural integrity on your motorcycle. A compromised access door can lead to water intrusion, dust contamination, and...11060029- SKU:
- 11060029
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TRAP DOOR
- PRODUCT NAME:
- RETAINING RING
- STYLE:
- OEM REPLACEMENT
$16.10
