Well I just now got around to repairing it, but I have ran into a problem....the fill bolt that you remove to put the gear oil in is stripped, and I can't remove it....I guess the previous owner had tried to repair it ince before.....now what do I need to do to get the bolt out?
If you know someone with a welder, have him weld a nut to the plug. It's by far the fastest, easiest, least destructive method.
If it's the kind I'm thinking of, with the square hole in it for a ratchet, you can get plug sockets that are a better fit and less likely to cam out if it's stripped just a little. Or if your ratchet is a cheapie, grind off the domed end of the drive so that your square corners go all the way to the end. You may get a better bite that way.
I have also successfully hammered a large torx bit socket into a rounded out plug to extract it.
Depending on how much plug sticks out, you might be able to catch the edge with a chisel and turn it out by hammering.
Big left-hand drill bit and a torch. Heat the plug until it's red, then start drilling just as soon as the redness fades. Either you'll make a hole in it, or, hopefully, the bit will catch and twist the plug out. Pay attention to how hot you get the housing so you don't cook out the seal.