i have a 1984 sr5 toyota that i put rear springs up front and now when i drive it on the road at 35 mph i get really bad virations put as the speed increasis to 55 it goes away and then when i slow down to 35 mph it does it again.
If anybody can help me out please let me know.

 

Sounds like "death wobble". Usually caused by insufficient caster angle:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1
or something loose up front like worn spring/shackle bushings, loose shackle/spring bolts, etc.