Powerbox

 

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.

 

– 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 neutral switch for clean look
– 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

 

Polished Case

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

 

Recommended Upgrades
– Inner Primary High Torque Bearing Kit
– SP9: Street Performer 9 Plate Clutch
– King Kong Klutch
– FFP “Function Formed Primary”
– SBD “Softail Belt Drive”

 

Click on any of the images below to learn more

High Torque Bearing Kit

SP9- Street Performance 9 Plate Clutch

King Kong Klutch

Function Formed Primary

Softail Belt Drive

 

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

 

Back to the Top

 

Product

PBL701PN Left Side Drive PowerBox

PBR701PN Right Side Drive PowerBox

PBR701PN-N1, Right Side Drive PowerBox, Black Anodized, Special Order

PBL711PN, Right Side Drive PowerBox, Black Anodized, Special Order

 

Lifestyle

LSD PowerBox in a Brass Balls Bobber

LSD PowerBox in the Krugger AMD Bike

LSD PowerBox in the Krugger AMD Bike

LSD PowerBox in the Kraus ‘Snatch’ Bike

 

Videos

 

 

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