I got some serious pinion seal problems, i had a rear end complete overhaul with a new pinion seal that leaked and then i put in a speedy sleve and new seal and it is seal leaking. I am wondering if maybe the vent might be causing the problem. Before the overhaul it never leaked. can anybody maybe give me an approx. location of the diff vent? Is it a tube going up to the car or, is it just a hair pin hole or what??? Please help, i am sick of cleaning up afer my rear end.