So I tried putting oil in my front diff tonight and it leaked out past the driver's driveshaft. I can't seem to get it to clip back into the gearbox (I've recently had the engine out). Last time I removed the engine the driveshaft came out easily with the screwdriver in the diff method, this time however it really wouldnt budge when I removed it. I fear I may have broken the little ring that sits on the driveshaft. Is this a likely failure and can you buy replacements??