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Transmission for Big Twin 5-Speed

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Transmission Parts

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Transmission Parts

Parts for Transmission Housing

Parts for Transmission Housing

Main Shafts and Related Parts

Main Shafts and Related Parts

Counter Shafts and Related Parts

Counter Shafts and Related Parts

Shifter Fork Shafts

Shifter Fork Shafts

BAKER Billet Steel Shift Forks

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.

Caged needle bearings for 5 speed gears.

JIMS Transmission Trap Door

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.

BAKER High Torque Ball Bearings

BAKER High Torque Ball Bearings

The OEM 34091-85 inner bearing race has been used on Big Twins since 1985. The inner primary bearing rides on this race. By design, this race press-fits onto the transmission mainshaft. This system works fine for stock motors, however, 100 HP+ motors will make this bearing walk on the mainshaft. If it walks inboard, it will damage the maindrive gear seal and cause a transmission oil leak. If it walks outboard, it will cause a primary oil leak. Our high torque bearing kit eliminates this condition. Kit includes a precision honed bearing and seal.

Jims Master Transmission Rebuild Kits

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.

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

BAKER Shifter Lever

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.

BAKER Ratchet Pawls

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,

Shifter Pawl 5-Speed Big Twins

Shifter Pawl 5-Speed Big Twins

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

BAKER Transmission Dipstick

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.

BAKER Speedo Sensor Hole Plug

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.

Snap Rings for Shifter

Snap Rings for Shifter

Springs for Shifter

Springs for Shifter

Transmission Filler Plug for 5-Speed Big Twins

Transmission Filler Plug for 5-Speed Big Twins

Drain Plugs OEM Replacement

Drain Plugs OEM Replacement

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com