Gear case was relatively easy to replace and came pre-filled with gear lube. With YouTube assistance, was able to replace in about an hour. This does not include any manuals, but you can find easy to follow step-by-step instructions on YouTube by searching for Ariens and the part number. I also ordered the L3 Synthetic Gear Lube which was a nice comfort to have just in case, but wasn't needed as the case came pre-filled with Gear Lube. If you don't have extra shear bolts, it is a good idea to order extras and replace at same time as you will have to remove them anyway. They could be re-used, but as they are shear bolts, I don't like to re-use.