The lower rear trailing arms are built from 2-inch 0.120 wall chromoly tubing and boxed in with 0.125-inch chromoly plate that is doubled up near the lower shock eyes. 1 1/4-inch rod ends hold the links to brackets on the axle housing and framerails. The rear suspension and axle fab work was done with an eye towards building the strength required for the abuse they will receive, while living with the relatively heavy weight of the 14-bolt as a tradeoff for low cost. The upper links were constructed from 1 3/4-inch 0.120 wall chromoly tubing. You can also see that the stock Chevy frame rails were fully boxed using plate steel to keep them from flexing more than they should.