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PowerBox 6-Speed

The design directives for the TorqueBox were clearly established in the early stages of development. This flagship gearbox had to have a 250 ft-lb torque capacity gearset but externally look like 400 ft-lb standing still. Development costs and resultant retail price were deemed irrelevant. By choosing the venerable 6-71 blower for architectural inspiration, we inadvertently gave rise to what is now trademarked as Function Formed™ design.

Enter the new PowerBox; Function Formed™ looks without the need to pawn your guns or your wife’s jewelry. Design inspiration from the TorqueBox coupled with a diamond ground 8620 steel 6-speed overdrive gearset gives the PowerBox an input torque capacity of 165 ft-lb, with a 400 ft-lb curb appeal; some may argue more. More because the tidy compact design of the PowerBox makes the function Formed design elements pop out more. 34Ds will always be noticed more on a petite chick than a larger chick; same concept.

1990-2006 Softail

  • Hydraulic actuator with 1.5” piston standard. 11/16” master cylinder recommended
  • RSD comes with choice of 29 tooth zero offset pulley, 23 tooth or 24 tooth .2” chain sprocket
  • RSD can be upgraded with various offset chain sprockets and sizes to suit application. No pulley option available due to tight actuator spider size
  • LSD comes with choice of pulley or sprocket
  • LSD can be upgraded to all pulley and chain sizes and offsets to suit application
  • No cost upgrade to N1 drum
  • Speed sensor provision located on back of case requires .120 spacer
  • 12 point stainless steel ARP fasteners
  • Choice of standard and ‘R’ ratio gearsets
  • 5 Year limited warranty

Benefits

 

  • No neutral switch for clean look
  • Unique Function-Formed styling

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      Case Finish
      The PowerBox transmission only comes in a Show Polished finish. Special finishing is available and special charges due apply. 

      Shift Drum Options
      Standard shift drum pattern (1-N-2-3-4-5-6)
      N1 shift drum pattern (N-1-2-3-4-5-6) 

      Redundant Neutral System

      Shift System
      Our shift system with roller detent guarantees smooth shifts every time and our redundant neutral ensures  that finding neutral is a easy chore. We mount a plunger detent on the left side pillow block and cut a plunger track into the shift drum itself.  The plunger follows this track during operation (shifting) and when shifting into neutral pops into a pocket. This system lets you feel that you’re shifting into neutral. No more guessing.  Shift drum features more aggressive timing on the fork groove profiles and is case hardened to 58 Rockwell for wear resistance and crisp shifts. We built our reputation on smooth shifting 6-speed transmissions; our drum designs benefit from the engineering lessons learned. 

      Power Box Internal View

      Design
      Design inspiration from the TorqueBox and coupled with our diamond ground 8620 gear steel 6-speed overdrive gearset gives the PowerBox an input torque capacity of 165 ft-lb, with a 400 ft-lb curb appeal; some may argue more. More because the tidy compact design of the Power Box makes the function Formed design elements pop out more. 

      Gearset
      The PowerBox utilizes the OD6 gearset. Made out of 8620 steel, gears are shaper cut before heat treat then precision ground with diamond coated tooling after heat treat (58-62 Rockwell ‘C’). This extra steps ensures not only a quieter gear pair, but enables much tighter backlash control. This tighter control on the gears yield a silent operation.

       

      Left Side Drive Power Box Layout

      Right Side Drive Power Box Layout

      Speedometer Pickup
      The PowerBox has it’s speedometer pickup location in the middle of the case on the back side. The sensor reads off of the 4th gear. The electronic speedometer provision would utilize a stock 1996-2006 speed sensor, PN 74437-96 along with the .120″ spacer provided. Pending what type of electronic speedometer you use, an additional speedometer recalibration box might have to be purchased, BAKER PN 95E-56A.

      Speed Sensor Pickup Location

      Recalibration Box  95E-56A

      The PowerBox come in a standard or R-Ratio gearset configuration 

      Standard Ratios
      1st Gear 2.94
      2nd Gear 2.21
      3rd Gear 1.60
      4th Gear 1.23
      5th Gear 1.00
      6th Gear .86
      R-Ratio Ratios
      1st Gear 2.82
      2nd Gear 2.08
      3rd Gear 1.60
      4th Gear 1.23
      5th Gear 1.00
      6th Gear .86

       

      Fitment
      1990-99 Softail-based RSD (right side drive), LSD (left side drive) frames and custom applications

       

      PN Description
      PBR701PN Show polished RSD PowerBox assembly w/ standard ratios
      PBR7211PN Show polished RSD PowerBox assembly w/ ‘R’ ratio
      PBL701PN Show polished LSD PowerBox assembly w/ standard ratios
      PBL7211PN Show polished LSD PowerBox assembly w/ ‘R’ ratio

       

      Notes:
      – For a N1 shift pattern Drum add suffix “-N1″ after the part number; Ex: PBL701PN-N1
      – RSD comes with choice of 29 tooth zero offset pulley, 23 tooth or 24 tooth .2” chain sprocket
      – RSD can be upgraded with various offset chain sprockets and sizes to suit application. No pulley option available due to tight actuator spider size
      – LSD comes with choice of pulley or sprocket
      – LSD can be upgraded to all pulley and chain sizes and offsets to suit application

      Spectro Oil BD-75140

      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

       

      PowerBox Fluid Capacity Dry: 22-24fl-oz
      PowerBox Fluid Capacity Wet: 18-22fl-oz

       

      Installation Instructions
      PowerBox LSD exploded views and Specs: Click Here
      PowerBox RSD exploded views and Specs: Click Here

      Standard Gear Case Finish Examples (Not applicable to all products)

      Chrome

      Polished

      Raw

      Wrinkle Black

      These example finishes are intended to show the exterior treatments of cases, top covers and doors.

      TERM AND CONDITIONS                                                                                         

      • BAKER Drivetrain reserves the right to change prices, terms or policies at any time without notice.
      • Orders can be pre-paid using Visa, MasterCard, American Express, Discover or PayPal.
      • All orders not pre-paid will be sent C.O.D. certified check or money order only unless pre-approved for company check acceptance.
      • Any orders from outside the USA must be pre-paid in US funds via wire transfer; a $30 transfer fee will apply.
      • Prices shown are F.O.B. Haslett, MI.

      LIMITED WARRANTY POLICY

      BAKER™ transmission assemblies, transmission kits, primaries, and oil pans are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 5 years from the date of purchase or up to 50,000 miles. BAKER™ clutches, kicker cover kits, belt drives, F6F kit, reverse systems, covers and accessories are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 2 years from the date of purchase or up to 24,000 miles - whichever occurs first. If the product is found by BAKER™ to be defective, such products will, at the option of BAKER™, be replaced or repaired at cost to BAKER™. 

      In the event warranty service is required, the original purchaser must call or write BAKER™ immediately with a description of the problem. If it is deemed necessary for BAKER™ to make an evaluation to determine whether the transmission assembly or transmission kit or accessory is defective, the entire transmission assembly, whether originally purchased as an assembly or kit, must be properly packaged and returned prepaid to BAKER™ with a copy of the original invoice of purchase. If after an evaluation has been made by BAKER™ and a defect in materials and/or workmanship is found, BAKER™  will, at BAKER™  option, repair or replace the defective part of the assembly. 

      WARRANTIES FOR "INSIDER SPECIAL" PRODUCTS

      Due to the uniqueness, low price and assembly outside of typical production process of products indicated as Insider Special products, purchasing these Insider Special products include a warranty so to guarantee the original purchaser to be free of manufacturing defects in materials and workmanship for a period of 1 year from the date of purchase or up to 12,000 miles. We have provided extended options for you to purchase below. 

      RETURNS AND EXCHANGES

      Any merchandise returned for any reason (exchange, credit or modification) must be accompanied by a Return Goods Authorization (RGA) number or it will be refused. Call BAKER™ to obtain this number prior to returning goods for any reason. There is a 15% re-stocking fee for all returned items. BAKER™ is not liable for any shipping charges. 

      ADDITIONAL WARRANTY PROVISIONS

      NOTE: Limited warranty does not cover labor or other costs or expenses incidental to the repair and or replacement of BAKER™ products.

      This warranty does not apply if one or more of the following situations is judged by BAKER™ to be relevant: BAKER™ OEM transmissions; (these are subject to the OEM manufactures warranty only), Improper installation, accident, modification (including but not limited to use of unauthorized parts, transmission oils or lubricants), racing, high performance application, mishandling, misapplication, neglect (including but not limited to improper maintenance), or improper repair. 

      BAKER™ shall not be liable for any consequential or incidental damages arising out of or in connection with a BAKER™ transmission assembly, transmission kit, component or part. Consequential damages shall include without limitation, loss of use, income or profit, or losses sustained as the result of injury (including death) to any person or loss of or damage to property.

      BAKER™ transmissions, transmission kits and accessories are designed exclusively for use in American V-Twin motorcycles. BAKER™ shall have no warranty or liability obligation if BAKER™ parts are used in any other application.

      If it is determined that a BAKER™ product has been disassembled during the warranty period for any reason, this limited warranty will no longer apply unless you were instructed to do so by a BAKER Drivetrain technician for diagnostic purposes.

      The words H-D®, Softail®, FXR®, Dyna®, FLT®, FLH®, Sportster®, and Buell® are registered trademarks and are for reference only.

      Questions? Ask us anything:
      Contact us
      Or just call us at 517-339-3835. We're glad to help.

      PowerBox 6-Speed
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