ok so when i am coasting or braking, especially when turning, i hear a loud knocking coming from either right below my feet (i can feel it on the floor sometimes) or behind me. its pretty loud and i was thinking. could the chain in my transfer case be doing this? im in 2wd so i wouldnt thing so, but i have no idea. second idea was bad pinion bearing. anywho has anyone had this happen? or is anyone familiar with tearing apart a transfer case?

 

Look at the exhaust pipe above the trans mount and make sure its not hitting it mind wiil do the same knocking on the floor

 

checked the trans mount and the exhaust and no signs of wear or rubbing on the pips and it isnt loose.