Hey guys, I had my rear end changed from the stock 3.27's to 3.90's and It's been *very smally* leaking. The first time it leaked it was the front pinion seal, second time (second time) it was the rear gasket. Now they guy who did them put a Ford gasket in (now, but before he used a generic one) and he also painted the rear end part black. Well.. I ran her from one end of the freeway to my house and came back checked underneath and I don't know if I'm paranoid or not, but it seemed to be dirty/greasy feeling.. but no oil was apparent. How exactly can I tell if I have a leak and does anyone's rear end feel a little greasy? Do you guys think this is a leak or am I buggin out?