Rear Axle Shopping
Rear axles
  Rear axles are a very important component of your  vehicle. They enable the back wheels of your car to move forward and also place  the strength of your rear differential in your back wheels. When your rear axle  breaks, it is time to purchase a new one, and purchasing a less than high  quality axle will leave you visiting your mechanic more than you really want  to. As such, here are some important things that you need to look for when  purchasing a new axle.
Know the particulars of your car
  First of all you need to identify the right year, make  and model of the axle you wish to purchase. Having this information at hand, is  a good way to start, as this will allow the right part to be matched with your  vehicle. This information can be gathered from your vehicle identification  number (VIN), which is often located on the driver side interior dash, in front  of your engine block, or stamped on the front end of the frame. If it is not  found in these locations, then you can find it on your title or insurance  records.
Shop around
  You must purchase your axle from a reputable auto part  company which is trusted by consumers all around, as this ensures the best  possible quality. If you wish to shop online, there are several websites you  can visit and these sites will also be able to help you search state by state  so that you will be able to find competitive prices. In other words, take as  much time as you need to shop around as this ultimately will mean that you get  the best quality for your money, and this is important if you are shopping on a  budget.
  Parts found in junkyards are often pulled from cars  that have been stolen or involved in accidents, so it is very possible that  good quality parts can be found in such locations. These parts very often, were  built with higher standards. It is therefore helpful to visit junkyards in your  area to see if they have anything that matches your need.  Many junkyards  are now becoming computerized so you do not have to walk around to find what  you want, they can simply do a computer search to see if they have what you  need in stock and if they do not have  what you need, chances are, they  can source it for you.
  Every part has an interchange number, which means that  some parts can interchange with other models, as they are the same exact part,  this means that the same model, although having different manufacture dates,  very often uses the same part. It is therefore very helpful to bear this in  mind when purchasing a rear axle, or any other part for your vehicle.
  It cannot be stressed enough that shopping around is  the only way to ensure that you get the best quality of anything you wish to  purchase and at the best prices.