new 8.25 shudder in low speed turn

For posterity, I should add that the new oil is non-synthetic 80w90 GL-5 without limited-slip additive. Unfortunately, since so many things were done at once I don't know why the chatter is gone now--it could be the new bearings, could be the change of lubricant, it could be simply that the old oil was contaminated, or it could be that they increased the pinion bearing preload when they replaced the seal (it was about 7 in-lbs to turn the pinion, and they set it to 15 in-lbs).