Tony, I'd be leaning more towards it being a tire issue. I've twisted driveshafts in the past and only had a vibration through 1st and 2nd gear...not noticeable anywhere else. Once in high gear, it smoothed right out. Had this happen twice.
Last year I had a slight vibration in 2nd gear only...turned out to be wear in the U joints. New U joints and it's smooth as silk again.
He has balanced the tires twice now . On a spin balancer . I told him call Hoosier and see if he did something wrong . Maybe they can only be bubble balanced ? Or maybe something wrong with these tires. They take 9-10oz to balance .even tried moving them around on the rim
