I have an 81 sub. From the looks of it I've got an NP208 with a slip yoke and a 12 bolt rear. I am going to be lifting it for the first time, 4 inches in the back 3" in the front all new springs from tuff country and run 33x10.5 s. What should I do about my driveshaft angle? Will it be fine, do i need to get rid of the slip yoke, do i need to shim the back axle? Any advice would be great!!! Uuummm did i also mention i would like to spend as little as possible since the lift kit, with all the goodies, is going to take a large bite out of my wallet. Thanks!!!!!