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Transmission for Big Twin 4-Speed
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Shifter Tops and Parts

Shifter Tops and Parts

Parts for Handshift Tops
Parts for Handshift Tops
Selection of replacement parts for handshift transmission tops from 1936–early 1976.
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BAKER Ratchet Tops
BAKER Ratchet Tops
Performance transmission top assemblies by the US company BAKER. These stock replacement Ratchet Tops are available in your choice of an FL or FX shift system, with the FL systems set up as bottom pull and FX systems set up for top pull.
All tops feature billet steel machined and case hardened shift systems that rotate on Permaglide bushings and a linear detent system for a smooth repeatable shift each time. The lids are cut out of Aircraft grade 6061-T6 billet aluminum. A hidden top cover vent design eliminates clogged vent screws. The shifter pawl backing plate is hard anodized for wear resistance.
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BAKER N1 Shift Drum Kit
BAKER N1 Shift Drum Kit
The N1 shifter drum by Baker converts a standard FL shifter cover (ratchet top 1952-1979) from the stock 1N234 shift sequence to 4321N (Neutral all the way up). This is very helpful when drag racing or at traffic light "encounters", because you just stomp down on the shift lever from Neutral to upshift. Jockey shifters and suicide clutch users also benefit from this set-up because the "all the way forward" neutral makes quick stops safer.
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Ratchet Top Assembly
Ratchet Top Assembly
Complete foot shift transmission top cover for FL models with shifter lever pointing down. They come complete with all internal parts, chrome-plated dust cover & lever, neutral switch and all necessary hardware.
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Parts for Ratchet Tops
Parts for Ratchet Tops
Selection of replacement parts for ratchet tops from 1952–early 1979.
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Dust Covers for Ratchet Tops
Dust Covers for Ratchet Tops
Chromed dust covers and levers for all foot-shift Big Twins thru early 1979. Look good and protect the shifter mechnism from dirt and humidity. Include small parts.
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Shifter Forks for 4 Speed Big Twins
Shifter Forks for 4 Speed Big Twins
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Shifter Fork Bushings and Parts
Shifter Fork Bushings and Parts
Top-quality shifter fork bushings and related parts to be used as stock replacement in 4-speed Big Twin transmissions thru 1986 and 45 cui. (750cc) Flatheads.
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Shifter Fork Shafts for 4 Speed Big Twins
Shifter Fork Shafts for 4 Speed Big Twins
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Parts for Dome Top
Parts for Dome Top
A selection of replacement parts for dome tops from late 1979–1986.
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Shift drum, cover, etc.

The gear change mechanism on the 4-speed Big Twin transmission can be removed and repaired separately. When selecting the parts, it should be clear which year group the assembly you want to repair belongs to:

  • Tank shifter 1936-1964 (the shift linkage ends at a simple lever that moves a few degrees with each gear engaged)
  • Foot shift 1952-1978 ("ratchet top" because of the automatic gearshift with ratchet mechanism, the engaged gear is not recognizable from the outside)
  • Foot-operated gearshift 1979-1984 ("dome gearbox" because of the dome on the gearbox housing)

The ratchet top has two different gearshift rollers: one for the FLHs with a bottom-mounted ratchet mechanism and one for the FX with a top-mounted shift linkage. If in doubt, the contact details below will help you untangle the problems.

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