I have a little garden tractor that I keep around my house. I plow my sidewalks, let the kids ride it, pull a little dump trailer around, and pull broken down cars into my garage with it. I have chains, filled tires, and two batteries on the rear for some added weight. So there is some extra stress on the rear diff. I just bought a used 1990 3500 4x4 454 pickup. The fuel pump went out and I had to tow it over to the garage, slighty uphill. I had to give it an extra little tug (in 8th gear ) to get up over a slight knoll, well something broke. Notice the negative camber that the rear wheels have? I think the rear differential might be broke. I didn't have the chain hooked onto the rear end either. Oh well, I have two extra rear ends for it. This time though, its getting a 4" rear pulley instead of the 8" thats on it. I thought a you guys might get a chuckle out of it.