The factory axle tubes are pinned to the center section. In lieu of a brace, you can have your local shop weld the tubes to the center section. I did it to mine. Here's a picture I found on Google:
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This is great, IF you have a shop that knows what they are doing and places them on a jig and knows how to warm it up then cool it back down slowly etc... its a little sensitive. you can actually weaken the tubes rather than strengthening them if you do it wrong..
And that's why bolt on parts are cool, personally I am not taking the chance it comes out right.



