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One day in the past we came out with the 6-into-4 for Shovelheads as a favor to a friend. Low and behold, sales of these transmissions have been a complete shocker and the message is loud and clear:
People love their Shovelheads
and they ride the piss out of them!
Our 6-into-4 transmission is a direct replacement for the 1970-E84 4-speed, available with or without the time-honored 1936-84 style kicker.
New for 2008, we have new mainshaft lengths that allow for Knuckle and Pan applications! People love these bikes too!
In a 4-speed, 4th gear is 1:1. Our 6-into-4 6-speed overdrive has a 1:1 5th gear and a .86 6th; good for a 500 RPM reduction in cruising RPM on the highway
Details:
- Available in show polished, wrinkle black, or raw finishes
- Choice of Hydraulic (extra cost) or conventional mechanical kicker cover
- Kicker includes a polished brass pedal
- Many optional gear ratios available (See the OD6 page)
- Now available with 33 tooth pulley
- For most 1936 to 1986 Applications only (mainshaft length varies depending on year/application)
6 into 4 Installation Instructions s PDF: [Download]
INSTALLATION NOTICE: The transmission bolts directly into your stock frame and your stock inner primary bolts right up. Due to the extended length of the transmission on the kicker side the exhaust pipe, oil tank and electric starter mounting brackets may have to be modified. Some inner primary covers require modification to clear the main drive nut. Some electric starter installations require modification of the transmission case for clearance. There is no speedo cable provision in the tranny case, but you can relocate the speedo cable to the front wheel. Another option is to convert over to electronic speedometer. An electronic speed sensor provision is in the door and it accepts factory 1994-later style sensors.

6-into-4 Media Kit:
Ratchet Top 4-Speed


We understand the love affair with your vintage motorcycle… There’s nothing like putting authentic, vintage styled components on your nostalgic bike. That’s why BAKER has taken the time to reinvent the 4 Speed.
With a vintage styled BAKER cast aluminum (A356-T6) transmission case, designed for traditional gear drive speedo pick up and modern late model electronic speedo pick up. As well as vintage style BAKER cast aluminum (A356-T6) top cover with linear detent system for that smooth and reliable shift quality you come to expect from BAKER.
The new BAKER 4 Speed comes available with many options for side covers, with our without kicker, Raw, Wrinkle Black or Polished finish and billet hydraulic or mechanical kicker cover upgrades. BAKER Kicker Gears come standard on kicker models. BAKER Modern 4-Speed Gearset is Made Out Of High Grade 8620 Gear Steel; Gears Ride on Needle Bearings Instead Of Brass Bushings. Direct bolt-in transmission on most models, whether you’re running a tin type primary or open belt drive.
- Vintage Style BAKER Cast Aluminum (A356-T6) Transmission Case Design To Fit A Roller Ball Bearing For Your Main Drive Gear.
- Case Designed for Traditional Gear Drive Speedo Pick Up And Modern Late Model Electronic Speedo Pick Up.
- Vintage Style BAKER Cast Aluminum (A356-T6) Top Cover With Linear Detent System For Smooth Reliable Shifting. Hidden Vent Design Allows Transmission to Breathe through the Top Cover Into The Ratchet Pawl System.
- BAKER Billet Steel Machined And Case Hardened Shift Drum Rides On 2 Permaglide Bushings For Smooth Repeatable Shifting Everytime.
- BAKER Billet Ratchet Pawl System With Hard Anodized Backing Plate And Case Hardened Carrier.
- BAKER Klassic Kicker Gears Come Standard On Kicker Models.
- Vintage Style Cast Mechanical Kicker Cover Come Standard With Early pn 37310-39 Cone Style Throw Out Bearing And 1-Piece Release Rod.
- BAKER Modern 4-Speed Gearset Made Out Of High Grade 8620 Gear Steel; Gears Ride on Needle Bearings Instead Of Brass Bushings.
- Direct Bolt-In Transmission On Most Models, Whether You’re Running A Tin Type primary Or Open Belt Drive.
- With or Without Primary Ear Available
- 1936-1964 Knucklehead™/ Panhead™ Length Mainshafts Available
- 1965-1969 Late Panhead™(1st Year Electric Start)/ Shovelhead™ Length Mainshafts Available
- 1970-Early 1984 Shovelhead™ Length Mainshafts Available
- BAKER FL™(Bottom Pull), FX™ (Top Pull), Or N1 Shift Drums Available
- 23T Or 24T, 530 O-Ring Chain Sprockets Available
- Chrome Side Covers Available With or Without Kicker
- BAKER Billet Hydraulic Or Mechanical Kicker Cover Upgrade Option
- BAKER FF Hydraulic Kicker Cover Upgrade Option
- BAKER Billet Aluminum Outboard Bearing Support Upgrade Option
- BAKER Cast Stainless Straight Steel Kicker Arm, Stock Length Or + 1” Upgrade Option
- BAKER 4 Speed Transmissions come standard with a gear drive speedometer ring gear installed (see year / fitment for speedo drive gear ratios).
PN FITMENT SPEEDO GEAR DRIVE RATIOS
4-3664 1936-1964 FL and FX Models 2:1 RATIO, 7 Tooth Drive Ring Gear
4-6569 1965-1969 FL and FX Models 2:1 RATIO, 7 Tooth Drive Ring Gear
4-7085 1970-1985 FL and FX Models 1:1 RATIO, 7 Tooth Drive Ring Gear
4-70E84 1970-E1984 FL and FX Models 1:1 RATIO, 7 Tooth Drive Ring Gear
(for those who wish to use a modern splined clutch)
Custom Applications (applies to all year groups listed)
NOTE: Most FX Models; except 1971 & 72 use a front wheel drive unit for the speedometer
Late FL Models 1981-84 use a front wheel drive unit for the speedometer
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