Baker DD7 Slide-in Builder's Kit
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
www.dragspecialties.com
www.bakerdrivetrain.com
