BAKER "6-INTO-4" / SHOVELS KNUCKLES & PANS / '36-'86 BT & CUSTOMS

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Price:
$4,195

Description

Made to satisfy the old school tendencies while providing the ability to run reasonable RPM’s at highway speeds. Panhead and Shovelhead riders will love the ability to ride hard with their friends on late model bikes.

  • OD6-based transmission inside
  • Many gear ratio options
  • Many case, shift system and cover options

Benefits

  • Smooth out the rattle on the highway
  • Stay in the powerband

Case: The 6-Into-4 Transmission case comes in two different versions. Our 1936-64 case has no ear,  to work with the factory primary. Our 1965-1986 version includes  the primary ear bosses. These can be used with stock primary applications, belt drive applications, or running no primary plate at all. For the 1936-1964 Tapered Mainshaft applications, please note that the 6-into-4 case does not contain an alignment track or a provision for the primary adjustment bolt that you would normally find on a stock case. 

4 different mainshafts available for Knucklehead, Panhead or Shovelhead:

  • 1936 to 1964 Tapered Mainshaft**

  • 1965 to 1969 Tapered Mainshaft

  • 1970 to E1984 Tapered Mainshaft 

  • 1970 to E1984 Splined Mainshaft

1st Gear Ratio: The 2.94 1st gear ratio fits 1936-1986 FL & FX models. This gear ratio is an all around good ratio. 

2nd Gear Ratio will be a 2.21 ratio.

**For 1936-1964 Tapered Mainshaft applications, please note that the 6-into-4 case does not contain an alignment track or a provision for the primary adjustment bolt that you would normally find on a stock case. 

 

All 6-into-4 case options come with a machined in 5th stud. We took the weakest point on other aftermarket transmissions and made it into the strongest point on ours. The 5th stud commonly breaks out of its bolted on plate causing your driveline to tweak in the chassis. The 6-Into-4 Transmission case comes in two different versions. Our 1936-64 case is a no ear case to work with the factory primary. Our 1965-1986 version comes with the primary ear bosses on it. These can be used with stock primary applications, belt drive applications, or running no primary plate at all. Both cases have a provision for an electronic speedometer.The electronic speedometer would utilize a stock 1996-2006 speed sensor, PN 74437-96.Pending what type of electronic speedometer you use, an additional speedometer recalibration box might have to be purchased, BAKER PN 95E-56B. The BAKER 6-into-4 case does not have a gear drive speedometer cable provision on the case. 

  • Late 1984-1986 length mainshaft.  Diaphragm type wet clutch.

  • 1970-Early 1984 length mainshaft.  Shovelhead mainshaft.

  • 1970-Early 1984 Splined mainshaft. Shovelhead splined mainshaft.

  • 1965-1969 length mainshaft.  Panhead/Shovelhead.

  • 1936-1964 length mainshaft.  Knuckle/Panhead mainshaft.    

Shift Drum Options

  • Standard Drum Shift Pattern (1-N-2-3-4-5-6 shift pattern)

  • Revesre Drum Shift Pattern (6-5-4-3-2-N-1 shift pattern)

  • N1 Drum Shift Pattern (N-1-2-3-4-5-6 shift pattern)

Klassic Kicker Gears

Kicker Gears All BAKER 4-Speeds come standard with our Klassic Kicker Gears. Made out of 1018 HR Steel, tumble finished to around a 20 micro and heat treated to 50-55 RC; these gears roll smooth as glass. 

Kicker Cover Options

We manufacture and offer 6 different kicker covers making the 6-into-4 completely customizable from stock to custom build. Our kicker covers come in different finishes ranging from the standard cover to the raw replica cover to the show polished Function Form Hydraulic cover. Depending on the choice of cover and finish, additional charges may apply.  

The 6-into-4 comes standard with a straight kick arm.

Top Cover Options

The 6-into-4 comes standard with a single pole neutral switch top cover with our hidden vent.  The transmission can be ordered with our no-neutral top cover.

Gear Ratios

The 6-into-4 comes in a standard, optional or R-Ratio configuration

Standard

Ratios

1st Gear

2.94 / Optional 3.24

2nd Gear

2.21

3rd Gear

1.60

4th Gear

1.23

5th Gear

1.00

6th Gear

.86

 

New PN

Old PN

Description

Fitment

6N4-M0 M6402

2.94 1st gear (Standard)

1936-86 FL & FX; good all around gear ratio

6N4-M1 M6412

3.24 1st gear

1936-86 FL & FX; for heavy GVW applications

Note

Each transmission is hand built to order. Use the base part number above and add suffixes (with a “-“ before each suffix) to specify the desired configuration:

FinishesR=raw/casted, B=wrinkle black, P=polished

Drum Option: N1=N1 drum (N-1-2-3-4-5-6 shift pattern)

Case Style: Standard case has ‘4-stud ears‘ for primary, specify no ear case by adding NE suffix (1936 style)

Kicker Cover: Die Cast Clutch Arm Kicker Cover Standard. Optional kicker cover suffixes:

  • FF= function formed polished

  • BPH=Billet polished Hydraulic

  • BPM=billet polished mechanical

  • BC=billet cable type

  • E=electric start

Mainshaft: 1970-E84 mainshaft standard, Optional lengths:

  • 36 for 1936-64 mainshaft

  • 65 for 1965-69 mainshaft

  • 84 for 1984-86

Sprocket: 23 Tooth Chain sprocket standard. Specify optional 24 Tooth Chain sprocket by adding -24 suffix or -33 for Belt Pulley – 6-into-4 has 2 more gears than a 4-speed and sticks out 1.6” more. Rear exhaust pipe, oil tank brackets, and starter brackets may have to be modified for fitment. – Electric speed sensor provision in case accepts stock 1994-up speed sensors. – Some 1970s inner primaries may require modification for sprocket nut clearance.

Recommended Exhausts 

With the factory exhaust not fitting in most cases, you will need to make sure that you find an exhaust that goes around the side cover. The 6-into-4 has 2 more gears than a 4-speed and sticks out 1.6” more.

Recommended Fluid / Level Picking the right transmission fluid ensures the life and durability of your transmission, that’s why BAKER recommends a fully synthetic GL-5 rated gear weight oil of 75W-140. If a GL-5 rated gear lube is not available, these commonly carried viscosities (weights) will work: 75W-90, 75W-140 and 85W-140. BAKER does not recommend the use of Syn3 (20W-50).

For Bert’s  article on ‘Oil & Spiders’  Click Here  

BAKER 6-into-4 Fluid Capacity Dry: 22-24fl-oz BAKER 6-into-4 Fluid Capacity Wet: 18-22fl-oz  

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