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Universal driveshaft is typically an important and often the first upgrade for many racers, but for years universal driveshaft design and material have remain the same despite the drastic change of power source from brushed motor/NiCad batteries to now the more powerful Lipo battery/Brushless combination. At ST Racing Concepts we inspected all components of the traditional universals shaft and aimmed to improve in material and design. The material is critical and equally important is the heat treatment process. After months and months of prototype testing in different material and increments of heat treating, we believe we have develop a better finished product of this "standard" upgrade.
First the universal driveshaft bones have increase in diameter for more durability against the power of today's Lipo battery/Brushless motor combo, the heavier weight of shortcourse truck, and larger diameter of short course truck tires. We also used the same carbon steel material for axles, which features two sets of universal pin holes so you can get twice the life out of the same set of axles. Even the joints and joint pins are of carbon steel material and the pins features a "step" for the setscrew to more securely hold the universal driveshafts together. Lastly, even the universal shaft roll pin at the end was not over looked. Carbon steel at the pin although strong will unfortunately add excessive wear to the diff outdrives, thus a different material was selected just for the shaft pin for durability and ease of wear on the diff outdrives.
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