Another diff issue

Hey guys

I have a 02 sr5...it was my father's rig...he passed just over a year now...and about 15k ago I started getting a front end vibe ...sounds like aggressive tires...I am a experienced mechanic and have tried everything besides getting in to the diff ...New wheel bearings. ..cv axles twice ...tie rods and alignment. ..all new ball joints ...and problem still persists. ..tires are balanced. ..I replaced rear driveshaft as well ...they arnt cheap...I do play pretty hard ...but who makes a truck this small ...and don't hit the local sand pits and trails lol...if anyone can steer me in the right direction please let me know ...and fyi stock truck minus tires. ..