(+) View Larger

Shown with standard mechanical 4-speed kicker cover

(+) zoom in closer to see arp fasteners

(+) View Larger

Shown with no primary ear and with a hydraulic 4-speed ff kicker cover

6-into-4: direct 1970-to-early-1984 four-speed replacement transmission

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)
• Avaiable without primary mounting ear for cleaner looks on hardcore bikes

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:

• 6-into-4 Kit: 6-into-4 Logo, Photos, and Press Release (9mb)
• 6-into-4 Press Release Only
• Paul Cox Burnout Promo Photo (4mb)

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.

features

• 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

BAKER FUNCTION-FORMED™ hydraulic 4-speed kicker cover

BAKER 6-into-4 and 4-Speed (1936-1986) FL and FX Models (Big Twin)

• Fully show polished BAKER Function Formed design
• Aircraft Grade 6061 Billet aluminum for strength and increased part life
• 1 piece kicker shaft bushing
• Smooth and strong BAKER Klassic Kicker Gears
• 1 ½”diameter hydraulic piston
• For more better fitment and durability, the FF Hydraulic 4-Speed Kicker Cover is doweled to the door.

BAKER MECHANICAL 4-speed kicker cover

Is sealed better and has beefier walls for fat-ass riders or hard-ass riders who know karate. For more better fitment and durability, like the FF Hydraulic 4-Speed Kicker Cover the cover is doweled to the door.

BAKER Klassic Kicker Gears

Smoother and Stronger: We all know the struggle of that die-hard guy in the crowd determined to kick over his stubborn motor. This beautiful embodiment of man versus machine is pornographic in nature. Because starting that bike in a sea of onlookers is truly the money shot. With Harley kickers becoming increasingly difficult to find and Chinese knock-offs being the only thing available for 1936-86 kickers we took the initiative to develop a set of better kickers gears made in America, and manufactured with BAKER gear technology. Please install per OEM factory service manual.

• For 1936-1986 Big Twin 4-Speed Transmission Assembly or similar
• Hardened gear treatment to prevent common failure
• 16-tooth starter gear
• 24-tooth starter crank gear
• Will work with the 14-tooth OEM H-D starter gear

outer bearing support

Strengthen the Drivetrain: Support your mainshaft.

• For BAKER 6-into-4
• Fits only 530 chain sprocket with no offset
• Call for additional fitment details

n1 shift drum

Originally developed for drag racers, the N1 shift pattern (Neutral-1-2-3-4-5-6) was designed to prevent false neutrals between 1st and 2nd by positioning neutral under 1st. This drag racer trick also eliminates all room for error in finding neutral on a jockey shift bike. As you roll up to the stoplight you tap all the way down with your left hand and you are guaranteed neutral because it is the last stop on the shift pattern. Little Suzie notices your skill in negotiating your minimally equipped bobber to a seamless stop and decides to hop on and leave her boyfriend with hair on the bottom of his feet at the Tavern with his buddies who have real billy bob teeth. We don’t offer any products to help you from this point on.

4-speed n1 shift drum

The same benefits as the above drum set, with a N-1-2-3-4 pattern.

33-tooth pulley for baker 6-into-4

These pulleys are available upon request.