Harley Transmission Internal Components
Harley Bike Transmission Internal Components at JJ Motorsports
Rebuild your Harley's transmission with premium internal components from JJ Motorsports, featuring high-strength countershafts, sealed bearings, and detent springs for smoother shifting and long-lasting durability on Big Twin, Evo, and Twin Cam models. These precision parts ensure reliable gear engagement and reduced noise.
Shop Andrews, JIMS, and Eastern Motorcycle Parts transmission internals for OEM-quality performance. Explore related categories such as Harley drivetrain for clutches and chains, or Harley for exhaust and cams to complete your rebuild.
Top Harley Transmission Internal Components
- Andrews Countershaft 296700 – High-strength countershaft for 5-speed transmissions; heat-treated for smooth shifting on Evo Big Twins.
- JIMS Bearing 8998K – Sealed mainshaft bearing; precision fit for reduced vibration in Twin Cam models.
- Eastern Motorcycle Parts Detent Spring A-34483-02 – OEM-spec detent spring for shift forks; restores crisp gear selection on Sportster and Dyna.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
On Sale
EASTERN MOTORCYCLE PARTS Sprocket Shaft Nut - 35047-71A A-35047-71A
EASTERN MOTORCYCLE PARTS
MSRP: $14.95Now: $13.60Was: $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...11060089- SKU:
- 11060089
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- MAINSHAFT SPROCKET NUT
MSRP: $14.95Now: $13.60Was: $14.95 -
On Sale
EASTERN MOTORCYCLE PARTS Clutch Hub Nuts A-37495-91
EASTERN MOTORCYCLE PARTS
MSRP: $16.95Now: $15.42Was: $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...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
MSRP: $16.95Now: $15.42Was: $16.95 -
On Sale
EASTERN MOTORCYCLE PARTS Bearing - 8970 A-8970
EASTERN MOTORCYCLE PARTS
MSRP: $35.95Now: $32.71Was: $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...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
MSRP: $35.95Now: $32.71Was: $35.95 -
On Sale
EASTERN MOTORCYCLE PARTS Transmission Mainshaft Bearing 44-0520
EASTERN MOTORCYCLE PARTS
MSRP: $110.95Now: $100.96Was: $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...11060232- SKU:
- 11060232
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING
- UNITS:
- EACH
MSRP: $110.95Now: $100.96Was: $110.95 -
On Sale
EASTERN MOTORCYCLE PARTS Shifter Fork Shims - 0.007" A-6750
EASTERN MOTORCYCLE PARTS
Now: $6.10Was: $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...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
Now: $6.10Was: $6.70 -
On Sale
EASTERN MOTORCYCLE PARTS Shifter Fork Shims - 0.015" A-6752
EASTERN MOTORCYCLE PARTS
Now: $6.10Was: $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,...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
Now: $6.10Was: $6.70 -
On Sale
EASTERN MOTORCYCLE PARTS Shifter Fork Thrust Washers A-6754
EASTERN MOTORCYCLE PARTS
Now: $12.29Was: $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...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
Now: $12.29Was: $13.50 -
On Sale
EASTERN MOTORCYCLE PARTS Access Door A-35087-99A
EASTERN MOTORCYCLE PARTS
Now: $14.65Was: $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...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
Now: $14.65Was: $16.10 -
On Sale
EASTERN MOTORCYCLE PARTS Mainshaft - Ball Bearing - Clutch Side A-8978
EASTERN MOTORCYCLE PARTS
MSRP: $35.95Now: $32.71Was: $35.95A worn or damaged mainshaft bearing compromises your clutch engagement and shifts your power delivery away from the track. The EASTERN MOTORCYCLE PARTS Mainshaft Ball Bearing (A-8978) is engineered...11060034- SKU:
- 11060034
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- BALL BEARING
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- STYLE:
- CLUTCH SIDE
- TYPE:
- MAINSHAFT
MSRP: $35.95Now: $32.71Was: $35.95 -
On Sale
EASTERN MOTORCYCLE PARTS Shifter Cam Thrust Washers A-33212-SET
EASTERN MOTORCYCLE PARTS
MSRP: $22.95Now: $20.88Was: $22.95Shifter cam thrust washers are critical wear components that directly affect shift quality and transmission longevity. Over time, these washers degrade under constant pressure and friction, leading...11060035- SKU:
- 11060035
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- THRUST WASHER
- TYPE:
- SHIFTER CAM
- RIDING STYLE:
- STREET
- UNITS:
- SET
MSRP: $22.95Now: $20.88Was: $22.95 -
On Sale
EASTERN MOTORCYCLE PARTS Bearing Housing Retaining Plate A-35111-36
EASTERN MOTORCYCLE PARTS
MSRP: $20.95Now: $19.06Was: $20.95The bearing housing retaining plate is a critical component that ensures precise alignment and secure retention of your bearing assembly under high-stress conditions. Whether you're running stock or...11060043- SKU:
- 11060043
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- BEARING HOUSING
- PRODUCT NAME:
- RETAINING PLATE
MSRP: $20.95Now: $19.06Was: $20.95 -
On Sale
EASTERN MOTORCYCLE PARTS Retainer With Oil Seal A-35150-52
EASTERN MOTORCYCLE PARTS
MSRP: $8.95Now: $8.14Was: $8.95Proper crankshaft sealing is critical to preventing oil leakage and maintaining engine integrity during high-RPM operation. This retainer with integrated oil seal ensures a secure fit and reliable...11060044- SKU:
- 11060044
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- FEATURES:
- INCLUDES SEAL
- PRODUCT NAME:
- RETAINER
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- UNITS:
- EACH
MSRP: $8.95Now: $8.14Was: $8.95 -
On Sale
EASTERN MOTORCYCLE PARTS Roller Bearing A-9095-23
EASTERN MOTORCYCLE PARTS
MSRP: $22.95Now: $20.88Was: $22.95Precision roller bearings are critical to maintaining smooth, reliable operation in high-performance motorcycle applications. The EASTERN MOTORCYCLE PARTS Roller Bearing A-9095-23 delivers the tight...11060045- SKU:
- 11060045
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- ROLLER BEARING
- UNITS:
- 23 PACK
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
MSRP: $22.95Now: $20.88Was: $22.95 -
On Sale
EASTERN MOTORCYCLE PARTS Detent Spring A-34483-02
EASTERN MOTORCYCLE PARTS
Now: $4.19Was: $4.60A worn or damaged detent spring compromises your motorcycle's shift quality and can lead to missed gears or grinding transmission issues. The EASTERN MOTORCYCLE PARTS Detent Spring A-34483-02 is a...11060046- SKU:
- 11060046
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- STYLE:
- OEM REPLACEMENT
- TYPE:
- DETENT ARM SPRING
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SPRING
Now: $4.19Was: $4.60 -
On Sale
EASTERN MOTORCYCLE PARTS Detent Arm Spring A-33374-00
EASTERN MOTORCYCLE PARTS
Now: $8.55Was: $9.40A worn or damaged detent arm spring compromises your transmission's shifting precision and can lead to costly internal damage if left unaddressed. This OEM replacement component restores positive...11060047- SKU:
- 11060047
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- STYLE:
- OEM REPLACEMENT
- TYPE:
- DETENT ARM SPRING
- UNITS:
- 10 PACK
- PRODUCT NAME:
- SPRING
- RIDING STYLE:
- STREET
Now: $8.55Was: $9.40 -
On Sale
COLONY Transmission Stud - 3/8-16 x 3/8-24 9653-4
COLONY
MSRP: $19.95Now: $17.96Was: $19.95Transmission studs are critical fasteners that secure your transmission case and bell housing under extreme load and vibration. A compromised or failing stud can lead to catastrophic transmission...DS189937- SKU:
- DS189937
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- STYLE:
- REPLACEMENT
- TYPE:
- TRANSMISSION
- DIAMETER - THREAD SIZE:
- 3/8-24
- PRODUCT NAME:
- TRANSMISSION BOTTOM STUD
- UNITS:
- 4 PACK
- DIAMETER - THREAD SIZE:
- 3/8-16
MSRP: $19.95Now: $17.96Was: $19.95 -
On Sale
COLONY Transmission Stud - 7/16-14 x 3/8-24 9654-4
COLONY
MSRP: $20.95Now: $18.86Was: $20.95A transmission stud failure can sideline your build or cost you a race. The COLONY 7/16-14 x 3/8-24 transmission stud delivers the clamping force and reliability you need to keep your drivetrain...DS189936- SKU:
- DS189936
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- DIAMETER - THREAD SIZE:
- 3/8-24
- DIAMETER - THREAD SIZE:
- 7/16-14
- PRODUCT NAME:
- TRANSMISSION BOTTOM STUD
- STYLE:
- OVERSIZE
- STYLE:
- REPLACEMENT
- TYPE:
- TRANSMISSION
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
MSRP: $20.95Now: $18.86Was: $20.95 -
On Sale
Jims Shift Fork Shaft for Harley-Davidson 1987-2006 Big Twin 34088-87
JIMS
MSRP: $30.50Now: $27.45Was: $30.50A worn or damaged shift fork shaft compromises your transmission's ability to engage gears smoothly and reliably—especially critical in high-RPM riding or racing conditions. The JIMS Shift Fork Shaft...DS194250- SKU:
- DS194250
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIFT FORK SHAFT
- TRANSMISSION TYPE:
- 5 SPEED
- TRANSMISSION TYPE:
- 6 SPEED
- UNITS:
- EACH
- MATERIAL:
- STEEL
MSRP: $30.50Now: $27.45Was: $30.50 -
On Sale
Jims Splined Clutch Mainshaft for 1991-2006 Harley-Davidson Big Twin 5-Speed 35042-91
JIMS
MSRP: $467.65Now: $420.89Was: $467.65If you're running a 1991-2006 Harley-Davidson Big Twin 5-speed and want to maintain crisp clutch engagement under load, a worn or damaged mainshaft spline is a common culprit behind slippage and...DS199492- SKU:
- DS199492
- Availability:
- Ships Same Business Day
- Weight:
- 2.56 LBS
- PRODUCT NAME:
- MAINSHAFT
- TRANSMISSION TYPE:
- 5 SPEED
- UNITS:
- EACH
- RIDING STYLE:
- STREET
MSRP: $467.65Now: $420.89Was: $467.65 -
On Sale
EASTERN MOTORCYCLE PARTS Bearing Spacer - 11599/A 40-0160
EASTERN MOTORCYCLE PARTS
MSRP: $18.95Now: $17.24Was: $18.95Worn or damaged bearing spacers in your 6-speed transmission can lead to excessive gear noise, increased wear on adjacent components, and eventual transmission failure. This Eastern Motorcycle Parts...11060075- SKU:
- 11060075
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- MATERIAL:
- STEEL
- TRANSMISSION TYPE:
- 6 SPEED
- PRODUCT NAME:
- SPACER
- UNITS:
- EACH
MSRP: $18.95Now: $17.24Was: $18.95
