The best transmission decision is when substantial transmission reduction is needed. A worm gear is comparable to a helical equipment with a throat cut to increase the outer diameter of the wheel. The throat enables the worm gear to wrap fully around the threads of the worm. By slicing the threads on the worm fairly than the teeth, and by changing the number of threads, various ratios can be attained without having shifting the mounting arrangement. A exclusive feature of worm gears and worm gear assemblies is their ability to avert reverse rotation.