[SCOTI]

The duallys call for a heavier bag than a 2600. When I built a set of arms for my dually (from some extras), I pocketed the arms for larger RE-8/Firestone F7325's/26c bags (3"min; 5-6"ride; 9"max).

Despite my efforts to allow for max room, the larger OD bags were too close to the pocket edges for me. You could possibly get away w/the smaller diameter bags on a lighter set-up (sbc vs BBC) but my BBC/TH400 requires ~100psi to achieve ride height & rides very decent. Smaller bags would likely require more PSI which adds spring rate to the mix.

Using the cups adds to the overall spring height which I didn't want. By pocketing the arms, they sat into the arms like the coils would. The way I did mine also kept the 'pocket' flush w/the bottom edges of the arm.

In the end, I wound up using PB's 1" Forward lower arms so I could use the larger bags w/o issue & used home fabbed upper plates that attach under the x-member.

I have modified/stock upper arms. Since I raised my x-member, I needed steering shaft clearance (when air'd out). All the aftermarket arms would have required multiple steering u-joints because the front bushing barrel would interfere w/the shaft on the driver side. The OE arm only required a small clearance notch & allowed using stock straight steering shaft (now the Cherokee XJ set-up).