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
ANDREWS Mainshaft Drive Gear - 5th Gear 299105
ANDREWS
MSRP: $288.95Now: $260.06Was: $288.95If you're pushing your transmission to higher RPMs or upgrading to a performance build, your factory 5th gear may not deliver the durability or precision you need. The ANDREWS Mainshaft Drive Gear...DS199469- SKU:
- DS199469
- Availability:
- Ships Same Business Day
- Weight:
- 2.50 LBS
- MATERIAL:
- HIGH-NICKEL ALLOY STEEL
- UNITS:
- EACH
- TOOTH COUNT:
- 33
- TYPE:
- MAIN DRIVE
- PRODUCT NAME:
- GEAR
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD RATIO
MSRP: $288.95Now: $260.06Was: $288.95 -
On Sale
ANDREWS Pulley - 30 Tooth 290304
ANDREWS
MSRP: $211.95Now: $190.76Was: $211.95The ANDREWS 30-tooth pulley delivers precise belt drive control for custom cruisers and touring bikes where stock ratios don't cut it. Machined from heat-treated, gear-quality steel, this U.S.-made...DS199477- SKU:
- DS199477
- Availability:
- Ships Same Business Day
- Weight:
- 5.08 LBS
- MATERIAL:
- STEEL
- MODEL:
- GOOD ACCELERATION
- PRODUCT NAME:
- PULLEY
- TOOTH COUNT:
- 30
- TRANSMISSION TYPE:
- 5 SPEED
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- UNITS:
- EACH
MSRP: $211.95Now: $190.76Was: $211.95 -
On Sale
ANDREWS Pulley - 34 Tooth 290344
ANDREWS
MSRP: $217.95Now: $196.16Was: $217.95The ANDREWS 34 Tooth Pulley delivers reliable, consistent power transfer for your drive system while maintaining tight tolerances essential for high-performance applications. Built from heat-treated,...DS199478- SKU:
- DS199478
- Availability:
- Ships Same Business Day
- Weight:
- 6.40 LBS
- MATERIAL:
- STEEL
- TOOTH COUNT:
- 34
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- MODEL:
- SMOOTH CRUISING
- PRODUCT NAME:
- PULLEY
- TRANSMISSION TYPE:
- 5 SPEED
MSRP: $217.95Now: $196.16Was: $217.95 -
On Sale
Belt Drives Ltd 96 Tooth 11mm x 1-1/2in Primary Drive Belt BDL-30884
BELT DRIVES LTD.
MSRP: $172.92Now: $164.27Was: $172.92The BDL-30884 Replacement Belt is designed specifically for BDL primary drives, ensuring optimal performance and durability. This high-quality belt offers a reliable solution for maintaining the...DS360011- SKU:
- DS360011
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- DRIVE BELT
- TYPE:
- PRIMARY
- WIDTH IMPERIAL:
- 1-1/2'
- STYLE:
- RIBBED
- TOOTH COUNT:
- 96
MSRP: $172.92Now: $164.27Was: $172.92Qty in Cart: 0Quantity:Price:MSRP: $172.92Now: $164.27Was: $172.92Subtotal: -
On Sale
Belt Drives Ltd Shoulder Bolts for 3in Belt Drive Electric Start Harley Davidson 1970-2006 ESB-100
BELT DRIVES LTD.
MSRP: $34.46Now: $32.74Was: $34.46If you're running a Belt Drives Ltd 3-inch belt drive clutch on your Harley, these shoulder bolts are critical to maintaining proper clutch engagement and longevity. Factory fasteners wear out, strip...DS360154- SKU:
- DS360154
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DIAMETER:
- 9,5 MM (3/8')
- LENGTH IMPERIAL:
- 1-1/2'
- LENGTH:
- 38,1 MM (1-1/2')
- PRODUCT NAME:
- SHOULDER BOLT
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- UNITS:
- 6 PACK
MSRP: $34.46Now: $32.74Was: $34.46 -
On Sale
Belt Drives Ltd 30 Tooth Transmission Pulley TP-30
BELT DRIVES LTD.
MSRP: $265.23Now: $251.97Was: $265.23Reducing unsprung weight at the transmission improves acceleration response and reduces rotational inertia—critical gains for both street and track applications. The Belt Drives Ltd TP-30 delivers...DS360165- SKU:
- DS360165
- Availability:
- Ships Same Business Day
- Weight:
- 2.69 LBS
- MATERIAL:
- 6061 T-6 BILLET ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- ANODIZED
- PRODUCT NAME:
- PULLEY
- TOOTH COUNT:
- 30
MSRP: $265.23Now: $251.97Was: $265.23 -
On Sale
Belt Drives Ltd Clutch Basket 4-Speed 1970-1983 Shovelhead EV-460
BELT DRIVES LTD.
MSRP: $338.95Now: $322.00Was: $338.95A worn or damaged clutch basket compromises power transfer and reliability—especially critical in high-demand 4-speed Shovelhead applications. This Belt Drives Ltd basket restores precise engagement...DS360412- SKU:
- DS360412
- Availability:
- Ships Same Business Day
- Weight:
- 10.65 LBS
- NUMBER OF TEETH:
- 68
- PRODUCT NAME:
- CLUTCH BASKET
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $338.95Now: $322.00Was: $338.95Qty in Cart: 0Quantity:Price:MSRP: $338.95Now: $322.00Was: $338.95Subtotal: -
On Sale
Belt Drives Ltd 8mm 144 Tooth Primary Belt for 1955-1984 Harley-Davidson FL Models BDL-37144-1
BELT DRIVES LTD.
MSRP: $105.38Now: $100.11Was: $105.38If you're running a classic Harley-Davidson FL with a BDL primary drive, belt degradation directly impacts power delivery and reliability. This OEM replacement belt restores the precision fit and...DS360012- SKU:
- DS360012
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- STYLE:
- RIBBED
- TOOTH COUNT:
- 144
- PRODUCT NAME:
- DRIVE BELT
- TYPE:
- PRIMARY
- WIDTH IMPERIAL:
- 1-1/2'
MSRP: $105.38Now: $100.11Was: $105.38Qty in Cart: 0Quantity:Price:MSRP: $105.38Now: $100.11Was: $105.38Subtotal: -
On Sale
Belt Drives Ltd Replacement Primary Belt 144 Tooth 2 Inch Wide for Harley-Davidson FL 1955-1964 BDL-37144-2
BELT DRIVES LTD.
MSRP: $144.46Now: $137.24Was: $144.46If your Harley FL primary drive is showing signs of belt wear or slippage, you're losing power delivery efficiency and risking catastrophic drive failure. The BDL-37144-2 replacement belt restores...DS360013- SKU:
- DS360013
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 144
- WIDTH IMPERIAL:
- 2'
- UNITS:
- EACH
- PRODUCT NAME:
- DRIVE BELT
- TYPE:
- PRIMARY
- STYLE:
- RIBBED
MSRP: $144.46Now: $137.24Was: $144.46 -
On Sale
Belt Drives Ltd 78 Tooth 14mm Primary Drive Belt for Harley-Davidson FL 1946-1952 BDL-38078
BELT DRIVES LTD.
MSRP: $288.77Now: $274.33Was: $288.77Primary belt wear is inevitable on vintage Harley FL models, and a slipping or degraded belt directly compromises throttle response and overall drivetrain efficiency. The Belt Drives Ltd BDL-38078...DS360015- SKU:
- DS360015
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- STYLE:
- RIBBED
- TOOTH COUNT:
- 78
- TYPE:
- PRIMARY
- PRODUCT NAME:
- DRIVE BELT
- WIDTH IMPERIAL:
- 1-1/2'
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $288.77Now: $274.33Was: $288.77 -
On Sale
Belt Drives Ltd 11mm Belt Drive Kit for 1955-1964 Harley-Davidson FLH 47-31SK-2
BELT DRIVES LTD.
MSRP: $764.62Now: $726.39Was: $764.62If you're running a classic FLH and still relying on an outdated chain drive, you're sacrificing reliability and adding unnecessary maintenance to your riding schedule. This 11mm belt drive kit...DS360108- SKU:
- DS360108
- Availability:
- Ships Same Business Day
- Weight:
- 8.90 LBS
- PRODUCT NAME:
- BELT DRIVE KIT
- COLOR/FINISH:
- ANODIZED
- UNITS:
- KIT
- WIDTH IMPERIAL:
- 1-1/2'
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
MSRP: $764.62Now: $726.39Was: $764.62 -
On Sale
Belt Drives Ltd 8mm 2in Primary Belt Drive Kit for 1955-1984 Harley-Davidson Kick Start Models 76-47-2S
BELT DRIVES LTD.
MSRP: $850.92Now: $808.37Was: $850.92If you're running a kick-start Harley from the golden age of American motorcycling, you know that stock primary drives weren't engineered for reliability. Belt Drives Ltd's 8mm 2" primary belt drive...DS360115- SKU:
- DS360115
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
- PRODUCT NAME:
- BELT DRIVE KIT
- THICKNESS IMPERIAL:
- 5/16'
- UNITS:
- KIT
- COLOR/FINISH:
- ANODIZED
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 144
- WIDTH IMPERIAL:
- 2'
MSRP: $850.92Now: $808.37Was: $850.92 -
On Sale
Belt Drives Ltd 3" Front Pulley 47 Tooth for 1984-1989 Harley-Davidson Softail 47EV-3
BELT DRIVES LTD.
MSRP: $289.33Now: $274.86Was: $289.33Your Softail's belt drive system demands precise pulley geometry to maintain proper tension, power delivery, and longevity. The Belt Drives Ltd 3" Front Pulley delivers the exact 47-tooth profile...DS360122- SKU:
- DS360122
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- COLOR/FINISH:
- ANODIZED
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PULLEY
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 47
- TYPE:
- MOTOR SHAFT
MSRP: $289.33Now: $274.86Was: $289.33Qty in Cart: 0Quantity:Price:MSRP: $289.33Now: $274.86Was: $289.33Subtotal: -
On Sale
Belt Drives Ltd Clutch Springs 6 Pack for 1970-1978 Harley-Davidson FLH Electra Glide ECS-100
BELT DRIVES LTD.
MSRP: $34.46Now: $32.74Was: $34.46If you're running a BDL Belt Drive clutch on your classic Harley, worn or weak clutch springs are the silent killer of smooth engagement and long-term reliability. The ECS-100 springs restore the...DS360156- SKU:
- DS360156
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- CLUTCH
- UNITS:
- 6 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SPRING
MSRP: $34.46Now: $32.74Was: $34.46 -
On Sale
Belt Drives Ltd 66T Starter Ring Gear for 1980-1984 Harley-Davidson FLT Tour Glide SG-1
BELT DRIVES LTD.
MSRP: $145.69Now: $138.41Was: $145.69If you're running a BDL Belt Drive clutch system on your 1980-1984 FLT Tour Glide, the starter ring gear is a critical component that directly impacts engine cranking reliability and overall...DS360157- SKU:
- DS360157
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- PRODUCT NAME:
- GEAR
- UNITS:
- EACH
- INSIDE DIAMETER:
- 187.3 MM
- TOOTH COUNT:
- 66
- TYPE:
- STARTER RING
- RIDING STYLE:
- STREET
MSRP: $145.69Now: $138.41Was: $145.69Qty in Cart: 0Quantity:Price:MSRP: $145.69Now: $138.41Was: $145.69Subtotal: -
On Sale
Belt Drives Ltd 66T Starter Ring Gear for 1970-1983 Harley-Davidson FLH Electra Glide SG-2
BELT DRIVES LTD.
MSRP: $164.62Now: $156.39Was: $164.62If you're running a BDL Belt Drive clutch on your classic FLH, the starter ring gear is your direct connection to reliable cold starts and consistent engagement. A worn or compromised ring gear...DS360158- SKU:
- DS360158
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- STARTER RING
- INSIDE DIAMETER:
- 174.6 MM
- PRODUCT NAME:
- GEAR
- TOOTH COUNT:
- 66
MSRP: $164.62Now: $156.39Was: $164.62 -
THRASHIN SUPPLY CO. M8 - Derby Cover Finned - Chrome TSC-3017-3
THRASHIN SUPPLY CO.
$189.95A quality derby cover protects your primary case from debris and road hazards while maintaining a clean, finished look at the heart of your engine. Thrashin Supply Co.'s finned design adds visual...11070695- SKU:
- 11070695
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- MOUNTING STYLE:
- 5 HOLE
- PRODUCT NAME:
- DERBY COVER
- MATERIAL:
- 6061 BILLET ALUMINUM
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- STYLE:
- FINNED
- UNITS:
- EACH
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
THRASHIN SUPPLY CO. Derby Cover - Polished - Classic TSC-3000-2
THRASHIN SUPPLY CO.
$119.95A polished derby cover transforms your engine's appearance while protecting critical internal components from contamination and moisture. This classic design delivers the refined aesthetic that...11070584- SKU:
- 11070584
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- MATERIAL:
- 6061 BILLET ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- STYLE:
- CLASSIC
- UNITS:
- EACH
- MOUNTING STYLE:
- 3 HOLE
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
THRASHIN SUPPLY CO. Derby Cover - Black - Classic TSC-3000-4
THRASHIN SUPPLY CO.
$119.95A quality derby cover protects your primary case from road debris, moisture, and oxidation while maintaining a clean, finished appearance on your engine. The THRASHIN SUPPLY CO. Classic TSC-3000-4...11070585- SKU:
- 11070585
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- COLOR/FINISH:
- BLACK
- MOUNTING STYLE:
- 3 HOLE
- RIDING STYLE:
- STREET
- MATERIAL:
- 6061 BILLET ALUMINUM
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- STYLE:
- CLASSIC
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
On Sale
ANDREWS Shift Fork - Main Shaft 209760
ANDREWS
MSRP: $39.95Now: $35.96Was: $39.95A transmission's shift fork is critical to reliable gear engagement and smooth shifting under load. The ANDREWS Main Shaft Shift Fork is engineered for durability in high-performance and racing...DS194200- SKU:
- DS194200
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- EACH
- TYPE:
- MAINSHAFT
- TRANSMISSION TYPE:
- 4 SPEED
- PRODUCT NAME:
- SHIFTER FORK
- RIDING STYLE:
- STREET
MSRP: $39.95Now: $35.96Was: $39.95
