I second the bearing check. Pull the bearing out of your hubs and check them with a pen cap or something for smoothness. also maybe look at anything on the left side for bending or if a screw is loose, seriously. Just check to make sure all the screws through the chassis are snug.
Then maybe your tie-rod lengths, make sure you don't have any unwanted toe in/out on either side (to start). Then maybe look at the diffs.
Good luck!