Ok when i shift out of park into drive and then to go take off there is a big jerk like the drive shaft isn't fully engaging into to the rear diff or something.Also if you put it into drive then go slowly you can feel it like lock in or something.Any ideas what this is?

yes, check your rear brake calipers, there is a problem with them sticking
(right rear)

ok thanks i will check and see if the problem is fixed