[mud slut 350]

sounds like your u joint. Mine did the same thing im only running a 4 inch lift but you shouldnt have to get a cv that just makes more moving parts and expensive to replace next time it s!@#s out. dump the blocks and do a shackle flip in the rear with 2" lift springs. it will ride better and tilt your axle without having to mill anything. If you trail ride its a lot better itll flex better and less axle wrap. blocks are horrible if your wheelin with the truck. for your steering look into a crossover setup from offroaddesign or sky manufacturing. the stock steering geometry blows and you will be able to turn sharper also. the roaring might be your pinion bearing also pull that diff cover off make sure theres fluid even in there and grab ahold of the pinion yoke and make sure it does not move at all if it does fix it asap or youll be lookin for a new rear axle.