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.
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Hydraulic clutch actuator only.
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No neutral switch hole in the top cover
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Speedometer hole for LSD or RSD
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LSD version fits 1984-99 Softail and Custom frames
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RSD version fits 1984-99 Softail-based RSD bikes and custom Softail-based RSD bikes
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Hydraulic actuator with 1.5” piston standard. 11/16” master cylinder recommended
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RSD comes with choice of 29 tooth zero offset pulley or 24 tooth .2” chain sprocket
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RSD can be upgraded with various offset chain sprockets and sizes to suit application. No pulley option available due to tight actuator spider size
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LSD comes with choice of 32 tooth pulley or 24 tooth .2” chain sprocket
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LSD can be upgraded to all pulley and chain sizes and offsets to suit application
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No neutral switch for clean look
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No cost upgrade to N1 drum
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Speed sensor provision located on back of case requires .120 spacer
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12 point stainless steel ARP fasteners
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Choice of standard and ‘R’ ratio gearsets
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Standard ratio gears 1st through 6th: 2.94, 2.21, 1.60, 1.23, 1.00, .86
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R-Ratio gear ratios 1st through 6th; 2.82, 2.08, 1.60, 1.23, 1.00, .86
