The driveshaft on my 96 Dakota "wobbles" for lack of a better word. I had it up on jacks the other day and it was running when I saw this. I drew a line around the shaft at the center point and it is out about 1/8" when I turn it. I am having a problem with fluid getting past the new output seal.

Is this driveshaft out a lot and would this cause it to leak around the seal.

Thanks, EVERYONE looks at this forum as opposed to the truck section.