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| History Of The Dual Range TM In 1982, when the decision was made to take an analytical look at the RV?ers towing problems, it didn?t take long to realize what the industry really needed was a 2-speed axle. But it soon became apparent that with the different vehicle applications and rear axle combinations required, plus the difficult of this type of installation, the idea would be both impractical and outrageously expensive. But what about a 2-speed that didn't have to be installed in the rear axle? The birth of the Dual Range Auxiliary Transmission was just the solution to achive the highest GVWR ever. |
Why a 2-Speed? Since the late 1970?s the large majority of RV towing has been done with ½-1 ton truck-type vehicles; most equipped with 3-speed automatic transmissions. With towing weights as high as 12,000-15,000 pounds there is no way, especially with the horsepower available, to have enough gearing for low speed pulling and still be able to cruise economically at interstate speeds. By selecting the proper Dual Range to complement your existing gear ratios, you can in fact, enjoy both -- Low-speed power and high-speed economy. |
How to Select Your Dual Range If you have plenty of low-speed power and you need high-speed help (this is becoming increasingly rare), then you would simply add the Dual Range with the higher gearing (overdrive). If you are OK on the road at high speeds, but just don?t have enough power from zero to 45 mph, then you need to add the underdrive ratios. Our technicians can help you make the decision for the best possible choice. With the proper Dual Range added to your vehicle, you will have both low-speed and high-speed help available at your finger tip. |
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| Factory Overdrives Within the last few years, the automobile industry has begun to offer overdrive transmissions as standard equipment. While they are some help to people using their trucks like Buicks, they are completely useless for towing. In fact, most factories prohibit towing in the overdrive position. However, by adding the low-speed version of the Dual Range (underdrive), the factory transmission becomes a real pleasure to use. Not only do you gain the pulling power so useful for towing, you are actually able to use that power in the factory overdrive mode. No one else in the RV industry can offer that feature. |
Dual Range It is really very simple. When you are loaded and traveling, keep the Dual Range in the low-speed position when under 45 mph or pulling hills. When you leave the parks or cities and are heading out across the interstates, shift to the high-speed position (50-65 mph). Of course, if you are parking your trailer for the season, you may choose to leave the Dual Range in the high-speed mode until you are towing again. |
Applications Available Class A Motor Homes; the very popular Class C version of the same; Fifth Wheel and Travel Trailers; Three and Four Speed Automatics; Four and Five Speed Standard Transmissions: We've Got Them All! And, we are adding new popular applications as soon as they become part of the towing world. The Dodge-Cummins Workhorse as an example. You have got to be strong to tackle this monster. And the Dual Range is the strongest! Call our technical marketing people. Tell them what you have and or where you feel you need improvement. Chances are, they already have a solution. |
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Beautifully engineered electronic control module mounts directly to the gearshift lever and permits precise remote control of the Dual Range TM Auxiliary Transmission.
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