i just dropped a 12 bolt posi rear end from a 67 camaro into my 70 nova as well as some comp engineering j bolt traction bars. She is hookin alot better but my question is do i have to adjust pinion angle even thought the parts are basically bolt on with no conversions of any kind? I do experience some vibration when shifting to 2nd. Could it be the pinion angle or maybe the preload on the traction bars?