i got a hose going from somewhere above my upper control arm to the upper right side of my diff on the pumpkin....what is this thing
It does exactly that, good thing to have otherwise you will find yourself running into a lot of problems that you dont want.It just lets air in and out of your diff...
When you are driving the fluid inside gets hot and expands, pushing air out of your diff.
When it cools off, the fluid contracts and air is sucked back in.
If you didnt have it, when the heated up, pressure would build up and could cause the seals to blow out.