I use full-contact shims (as described above, wedged shaped disc with holes for the bearing retainer bolts to go through) on many many solid rear trailing axles on FWD cars. When it's solid rear, like Matrix, Corolla, Sienna, it's the only way to correct for damage without replacing an otherwise-sound axle assembly. I've never used on on a Jeep, but there's no reason it wouldn't work. Offset ball joints can also solve it, but a shim is a few dollars, a ball joint $25+ and more work to install.
'91 Frankenheep YJ. 4.0, 4" BDS, Richmond 8.8, Titan 12k, 35" KM2's, rust.
'88 YJ, 4.2/4.0 head, +4˝" & shackles, BFG 33's (sold)