If you’ve ever had to replace a transmission you know that this can be a costly venture and I wouldn’t always suggest buying a used transmission as you are usually buying someone else’s problems. 

If your transmission hesitates when you put your foot on the gas or when it shifts there are clunks.  These are signs that your transmission isn’t happy and you want to relay this information to the technician when you take your vehicle in.  It will likely require them to take your vehicle for a road test to determine the issues.

A lady I met told me she had lost reverse gear in her transmission and for a full year she drove with it like that.  So everywhere she went she really had to think about where she was going to park so that she would be able to get out!