(for all your ev applications) 

Conventional transmissions whether manual or automatic are designed for internal combustion engines. The multiple gear ratios and ratio spreads work well with the rpm sensitive nature of small gas and diesel engines. For many years these conventional transmissions were primarily three and four forward speed units and in automatic, of course, incorporated a neutral, park and reverse mode as well. Over the last two decades the number of forward speeds has continued to increase in an attempt to squeeze more efficiency out of a less than efficient engine design. As the number of forward speeds has increased (now six, seven and eight speeds), the size and weight has also increased, and here is the PAIN! Electric car conversions are very weight sensitive and space is always at a premium.


Retaining the conventional multi-speed transmission when converting to electric power is wasteful to the extreme. ​

Electric motors as a rule are much higher in efficiency and make their peak torque right from a stop and over a much broader rpm range. This means that many electric car conversions could do very well with a smaller, lighter transmission package. In fact, most could do well with a single forward speed reduction gear box. As an example, All Tesla vehicles use  single speed transmission. This is of course true of most all new plug-in electric cars.

Also, brushless DC and all AC motor conversions do not need a reverse gear in the transmission as they can simply turn the motor in the reverse direction to back the vehicle up.

Standard ev-TorqueBox with Optional Cast or Billet Slip Yokes

Standard ev-TorqueBox with Optional ParkLock System

ev-TorqueBox Brand Extreme Duty Reduction Gearbox


Torque Trends Inc. has stepped up to the plate and is addressing the transmission PAIN of electric car converters all over the world. Our ev-Torque Box is a single speed reduction gearbox (underdrive) with several ratios available. It is compact, usually less than one third the size and weight of the transmission it replaces. This allows the motor to be placed further back into the transmission tunnel, improving weight distribution and opening up the under hood area for battery, charger, controller placement.


Remember, the lower we can get these components, in the vehicle, the better the vehicle handles. And, of course, at approximately 36 lbs.,it saves between seventy-five to one hundred lbs. The weight savings alone is significant.


Make your plug-in electric a complete electric vehicle not an electric motor/ICE transmission vehicle. Don't stop half-way in your conversion. Instead, step up to the benefits provided by an ev-Torque Box.


Specifications are for our reduction gearbox when used with an AC motor or any brushless motor where a reverse gear is not necessary.





  • Housings Are 6061 T-6 Aluminum

  • Input Shaft Is Through Hardened 300M

  • Helical-Cut Gear Set from 8620 Gear Material

  • Output Shaft Forged & Through-Hardened 27-Spline/32-Spline option

  • Rollerized & Balanced

  • Helical Gear Ratio 1.90:1

  • Run-In Tested Before Shipment


Two Year Unlimited Mileage Warranty

16483 N 165th Ave. Surprise AZ 85388

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