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These three items together and they have to be perfectly straight because ultimately later the drive shaft needs to enter the tube

Sit perfectly in the center of the diff whilst riding perfectly in the center of the bearing even if it's just a few millimeters off

It's going to cause big damage. The axle's going to fail and if there's something that's well out of your league

There's no shame in going to get getting expert advice from somewhere else

But ultimately if you could set out to build a car and touch every single component