I didn't complete the gear oil change project yesterday, so I resumed that today. With better lighting I could see that the spider gears are worn enough to account for what appears to be excessive rotational play. However, they are still good enough for government work. Maybe I'll replace them sometime later this year. Differential cover was painted a nice glossy black because I couldn't find semi-gloss black spray paint. I'm sure all the dust and things blowing past it will take that gloss off in not time. Then came the unexpected fun part. I bought a gallon of Super Tech gear oil at Walmart because it was $15 for the whole gallon instead of $10 a quart for the name brand stuff. When I got ready to put the gear oil in I crawled under the truck and noticed the fuel tank was in the way. I went over to the passenger side thinking there would be enough space to lift that gallon jug up above the differential and fill it from there. However, the muffler was in the way. So, I scrounged around the garage and foung a longer piece of flexible tubing to used so I could wrap it around the back of the differential and fill it from behind. This time the spare tire was in the way, so I removed it and proceeded to fill it. The weight of the gear oil pulled the hose out of the fill plug and I ended up spilling some on the driveway. After I secured that end of the hose the other end came off the thing I bought that screws on the jug and I spilled gear oil on top of the differential. When I shifted the jug backwards it ran down my arm. Now I had gear oil on my hands, so everything was slippery. I decided to set the jug down so I could wipe enough of it off so I could hold it in place again. Eventually I got it filled. As I was cleaning up I kept thinking to myself, "I smell gear oil." It turns out that I dragged my hair through the puddle of gear oil as I was getting out from under the truck, or maybe I poured it on my hair as I was fighting with a slippery bottle. There's a reason you don't see many mechanics with long hair.