I just purchased a 05 tj and took it to the shop to have everything looked at. The total list of things that need to be done was close to 1400, as the previous owner didn't take care of everything too well. To knock down the price, I figured I could change the differential fluid myself. I've never done it, but it seems like it shouldn't be too difficult. I don't know that much about cars, but am mechanically inclined. They quoted me at 175, seemed pricey to me. Any opinion on doing this myself and tips would be greatly appreciated.