Dang U-bolts!

RustyRatRod said
That's just not true. All I've ever used are round u-bolts and I've never crushed anything. Crushing the axle tubes comes from over torquing the nuts and nothing more. You're correct on the torque spec. It's only 45LBFT.

I have to wonder why ma-mopar went through the effort to do the flattening and the cross x if is not needed.