Transmission Parts

Parts for Transmission Housing

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Main Shafts and Related Parts

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Counter Shafts and Related Parts

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Shifter Fork Shafts

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BAKER Billet Steel Shift Forks

The BAKER Shift Fork Kits include all three forks and are a direct replacement for the standard OEM 5-speed transmission forks but with much needed improvements over the stock design. Cross section is three times thicker than stock.

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Gear Bearings

Caged needle bearings for 5 speed gears.

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JIMS Transmission Trap Door

Engines with 90+ hp exert significant forces on the transmission case which tends to flex when all ponies pull on the drivetrain. These doors are machined from billet aluminum and up to 5 times stronger than the stock counterparts which results in a stabilized case and reduced flex force.

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Jims Master Transmission Rebuild Kits

For all 5-speed Big Twin transmissions 1980-up. Each kit contains proven JIMS bearings and small parts plus all necessary gaskets. Everything together in one convenient package. This a big time saver.

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Shift Lever

Stock replacement for the shifter rod lever as used on 5-speed Big Twin transmissions 1985 to 2000.

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BAKER Shifter Lever

BAKER improved the shape of the splines, to prevent stripping, and a thicker truss style cross section offers a stronger overall design.

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BAKER Ratchet Pawls

The stock ratchet pawl used from 1980 to 2000 utilized a scissor spring that was well known for breaking. Each time an upshift or downshift is made the pawl spring is cycled. After many cycles, the spring leg breaks. The unfortunate side effect of this failure is the broken spring leg going through the transmission gears and destroying the transmission. The BAKER ratchet pawl utilizes a more substantial, rectangular cross-section spring like the 21st century Big Twins. Other improvements include:
Lever ‘beak’ for overshift protection, Pawl shaft lever splines are hobbed on a gear cutter just like our gears for high strength,

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Shifter Pawl 5-Speed Big Twins

Replacement shifter cam pawl for all Big Twin 5-speed transmissions.

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BAKER Transmission Dipstick

Have you ever heard of a 5-speed transmission dipstick breaking off and working its way into the transmission with disastrous results? Ask any seasoned technician; he’s seen one. Over time, the low frequency firing pulses of the American V-twin make the stock zinc die-cast dipstick break off and now you know the rest of the story. Bigger motors make this situation even worse. BAKER redesigned the dipstick with the largest radius possible between the stalk and the head. This radius stiffens the dipstick and increases its natural frequency.

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BAKER Speedo Sensor Hole Plug

If you need to cap off the speedo sensor hole for whatever reason, you need this plug. Some other companies do this with a steel plate and a gasket, just like old 4-speeds. BAKER plugs are machined from 6061-T6 and include a no-leak o-ring and a chrome button head screw for a clean look.

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Cannonball SSK-R Speedo Sensor Hole Plug

This speedo senser hole plug is ideal if the speedometer sensor is no longer required. Compared to other solutions with steel plate and a gasket, the Cannonball speedo sensor plug offers a clean solution made of billet aluminum and an O-ring that provides a reliable seal. A countersunk hex socket screw provides even more clearance when installing the SSK-R Kick Drive starter for BAKER 6-in-4 gearboxes.

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Snap Rings for Shifter

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Springs for Shifter

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Transmission Filler Plug for 5-Speed Big Twins

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Drain Plugs OEM Replacement