yes once i got the tcase drop in properly the vibes went away. I agree not going to pay to get drive shaft done twice. thank you for the extensive write up. what i am going to do is go to half off junkyard days in search of workable xj drive shafts. As well as explorer rear. the place i go will cut cost dramatically if I bring in workable parts then they are just basically making tube to length and balancing it. then I will be putting sye,8.8 and xj rive shafts front and rear. 250axle 250sye 250 for drive shafts. so 750 and I think I will have def upgaded. Then save for regear and new shoes, any comments welcome