Legendary Haslett , Michigan based Bert Baker - an icon among gear box aficionados - has spent decades proving that stock Harley-Davidson transmissions can be so much better . His Baker transmission operation is the custom motorcycle and V-twin industry ' s ' Go-To ' for anyone who wants better shifting , better power transfer and quieter , smoother transmission components that match performance with durability . Baker ' s direct drive seven-speed builder ' s kit ( DD7 ) upgrades any existing 2006-later big twin six-speed to a full seven-speed transmission . The DD7 is more than just another gear added to the mix for the sake of one-upmanship . Gear ratio management enables the motorcycle to make full use of the seventh gear to deliver the torque and power put out by Harley ' s engines . " We did not make this transmission a deep overdrive , rather we shortened first gear and tightened up the gears to deliver the riding experience that riders were after when they bought their bike . The gear ratios leave the rider with the experience of smooth , crisp , continuously pulling acceleration from first all the way through fourth gear . " Then they are able to start getting into the cruising portion of the program in fifth to seventh . No big drops in rpm from one gear to the next or lugging the motorcycle off of a stop light , just smooth , uninhibited acceleration . " We did not stop at just fixing the gear ratios . We improved the smoothness and crispness of the shifting by reducing the mainshaft mass by only having first gear be a part of the shaft , rather than first to fourth gears like on the stock unit . " Reduction in rotating mass for shift quality is a fact that has been utilized in the automotive world for years . We ditched the stock detent arm and spring assembly from the door in favor of a linear detent that decreased friction while increasing smoothness when
coupled with the all-new shift drum design . " We have tightened up the dog teeth on the gears to prevent the loud clacking noise that accompanies every shift on the factory six-speed . Through the use of a billet bearing door , 28 % wider bearings in the door , steel bearing retainer plates and full width gears , the durability and strength of our unit is a drastic improvement . " By utilizing fully diamond-ground , helical gears in first and fourth to seventh , we are able to deliver a much quieter riding experience . While second and third gears are diamond-ground , spur gears to handle the peak torque that is reached in that range ." The current DD7 kit comes standard with the tapered bearing kit , but can be easily upgraded to the new tapered bearing style main drive gear bearing . The DD7 includes a Baker shifter pawl , new main drive gear bearing and seal , door , top and side cover gaskets and is compatible will all types of aftermarket hydraulic side covers , as well as the stock Screamin ' Eagle versions . It is a direct slide-in installation - no case modifications are needed - and it clears all exhausts , works with all aftermarket clutches and is backed by a five-year limited warranty .
DRAG SPECIALTIES Janesville , Wisconsin , USA Tel : 608 758 1111 drag @ dragspecialties . com www . dragspecialties . com www . bakerdrivetrain . com