loping, grinding sound form the body?!

been kinda freakin me out for a while now. maybe someone here knows whats up. in my 70 dart, if i take a hard turn (such as a Uturn at the culdasack of a street) and crank the wheel all the way to the left(or right), i can feel a really hard grinding. it kinda lopes, not a solid EEEEERRRRT, more like ERT....ERT....ERT...(dont judge me on my onamonapia)

no idea what it could be. any help is appreciated! thanks!