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As I have been doing a lot of research on this recently I have found a couple of key things. There is a big differance in the way the pinion gears are made. Some brands cut the teeth all the back to the end like a standard rotation giving more meat to the gear (stronger) and some make the pinion shorter by cutting the back of the gear dowm right past the wear area of the gear and in doing so weaken the pinion. I will be using a precission set in mine if I cant find a spicer set.