The fourth gear from the PX 125 or the T5 can be built into all P200 models. A shortened fourth gear has a positive effect on tuned rpm-happy motors that need help pulling through the lower rpm ranges (and especially up hills). Veterans of truck battles, or anyone driving a 200er with a passenger know what we’re talking about. The shorter fourth gear gives you a fat connection from third to fourth gear. Your engine finally has a chance to turn it’s power into speed.