I had my birfields rebuilt last weekend with all OEM knuckle and wheel bearings. Before the replacement the truck was very controllable at highway speeds (anything over 50mph). It was very apparent that afterwards (on my drive home from picking it up), that it was very "twitchy" on the highway, requiring me to correct side to side movement constantly. Even though I knew my alignment was good, I got it re-checked yesterday, as the mechanic that did the rebuild said that one of my knuckle bearings fell apart when he removed it (so I thought maybe my previous alignment prior to this rebuild was thrown off by the new bearings. Alignment came back perfect... I will post the results below. Any idea what could be causing this? I have been on a 3.5" Slinky lift with Slee castor plates for almost a year without a problem. Only work done over the weekend was the knuckle rebuild. Would anyone know what the culprit could be?