It is ten years since Bert Baker ' s 6-into-4 was featured by the Discovery Channel in its ' How Its Made ' strand , and it remains a unique and uniquely specialist piece of kit - a true overdrive 6-speed to replace stock 4- speeds , " designed to satisfy old school tendencies while providing the ability to run at reasonable rpms at modern highway speeds ." " The 6-into-4 gearset design is based on our original , award-winning overdrive 6- speed and is tough as nails . With our 6-into-4 , you ' ll get all the benefits of an overdrive top gear , smooth shifting and the ability to stay in the powerband ." An upgrade to any 1936-1986 Big Twin 4- speed , it has many gear ratio and case , shift system and cover options to choose from , and 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 which would utilize a stock 1996-2006 speed sensor . Subject to what type of electronic speedometer you use , an additional speedometer recalibration box is separately available ; the Baker 6-into-4 case does not have a gear drive speedometer cable provision on the case ." Baker offers it in three mainshaft lengths - late 1984-1986 for diaphragm type wet clutches , 1970-early 1984 for Shovelheads and 1965-1969 for Panhead / Shovelhead . All Baker 6-into-4s come standard with its 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 . We manufacture and offer three different kicker covers , making the 6-into-4 completely customizable from stock to custom build . " It comes with a straight kick arm and as standard with a single-pole neutral switch top cover and Baker hidden vent design .
The transmission can be ordered with our no-neutral top cover . " Each transmission is hand-built to order with a 23-tooth chain sprocket as standard . Optional 24- tooth chain sprocket and 33- tooth belt pulley are available to order . The 6-into-4 has two more gears than a 4-speed and sticks out 1.6 " more . The rear exhaust pipe , oil tank brackets and starter brackets may have to be modified for fitment . The electric speed sensor provision in case accepts stock 1994-up speed sensors ; some 1970s inner primaries may require modification for sprocket nut clearance ."
BAKER DRIVETRAIN Haslett , Michigan , USA Tel : 517 339 3835 info @ bakerdrivetrain . com www . bakerdrivetrain . com