Why would you want to? The suspension differences between 2wd and 4wd on those trucks is huge. 2wd's have coil springs, the 4wd's torsion bars. Then there's the transfer case and the fact the 4wd has 2 driveshafts. You'd have to get a 2wd tailshaft for the trans and a different driveshaft.
2003 Ram 1500 QC Hemi Lonestar Edition (Mods list in profile)
2006 Charger R/T
Sarcasm - it beats killing people