2000 pontiac montana shimmy and vibrates on exceleration around 45?

[Belinda R]

coming from front end new brg assy and new tires ,rebalanced

 

[1coolmonty]

Have you checked the bushings that hold the lower control arm. When I was working at the Gm dealer we sold lots of these bushings, they wear out. The techs would call them hockey pucks because the look like one. you may have to lift the van to check these items also check tie rods.