I am buying 2 inch lowering springs, do i need to buy adjustable upper control arms? or do you sugest it? what happens if i don't? or can i get away with tranmission shims?

Brain

No, lowering should not pose a problem with getting it aligned using factory arms.

your talking about driveshaft allignment right?

Ohhhh, driveline alignment. 2" won't be in issue. I ASSume the rest of the drivetrain is stock (no overdrive correct?), if not then you may need to look into pinion angle mods.