I have a battered 2 wheel drive truck that I use to plow snow. It has a 77 12 bolt truck rear end in it. I have traction problems in reverse if I'm on much of an incline, as the weight of the plow being lifted tilts things forward. I would like to lock the rear end, using the cheapest way possible. I do not drive this vehicle on the road, nor more than 10 or 15 mph tops. So my question is how do I go about it? I have heard that you can simply weld the spyder gears, but don't know anyone who's done it, that isn't 6 feet under. Thanks!