rear tire wear

hi i have a 2000 ford windstar lx i am having problem with my rear tire wear from the inside any help please?

I dont think the Windstar has any adjustment for 'toe in' or 'toe out' (which is what could cause this condition). I would check the rear suspension bushings for normal wear-and-tear. If there are bushings that look damaged, I would replace the bushing(s). If you bought the van used you should get a carfax report to see if it was in a collision prior to you purchasing the vehicle. Possibly...the rear struts are worn causing too much 'bouncy' motion, which would cause the tire's uneven wear. In any event, you need to physically inspect the rear control arms and bushings.