Though it's not necessary, it's an excellent practice to remove the differential's oil before detaching the axle shaft and brake drum. By removing the oil, potential contamination and leaking are avoided. It could be achievable to take out the axle without draining, but doing so could be problematic and cause leakage from the remaining oil. Disposal additionally renders it possible to check for extra issues such as shavings of metal. For specific instructions, always consult the vehicle's service manual-certain types can have particular requirements. Having a tidy and organized approach a top priority provides more effective execution, minimizes the effects on the natural environment, and helps with avoiding costly repairs.