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My gear sets fit like factory. So well in fact that I did not even require shims which are usually required. I took it out on the trail and it works flawlessly. I use it on the Kratos Jeep
They are great they work really awesome in my 1/18 scale 6 by 6 axial the only problem is that the main front steering axle does not come all the way apart to change the gear that is on the axle. But love the parts i have good speed and tork.