How long before a worn motor mount would HAVE to be replaced?

I KNOW I HAVE POSTED THIS BEFORE...PLEASE DON'T ANSWER IF YOU HAVE ANSWERED IT ALREADY. I'M JUST TRYING TO GET AS MUCH INFO AS POSSIBLE.



I have a 1996 Ford Escort LX Wagon. It is an automatic and it has 120k miles. When I am sitting still in reverse, there is a strong vibration. After doing some research I have narrowed it down to either a worn motor or trans mount.



My question - Would a worn motor mount absolutely HAVE to be fixed? It runs so smooth other than when you're sitting still in reverse...would there be any signs that I could listen for to know if it's getting worse? I am completely broke and I need to know if this is something that can be put off for a few months...



Also...Would there be any noises that I could listen for so that I know 100% that I need to change it soon? The vehicle runs perfectly smooth unless you are sitting still in reverse, so I'm guessing it isn't THAT bad yet...could a vibration while sitting still in reverse be ANYTHING other than a bad mount? If it was in horrible shape, wouldn't I hear or feel things in gears other than reverse? I am completely broke and I am trying to figure out if I should or can drive this vehicle to work.



Please help!!!How long before a worn motor mount would HAVE to be replaced?
i have a 96 oldsmobile with 200k miles on it i had a worn out motor mount everytime i would accelerate or put the car in gear it would pop. i drove 30,000 miles before i changed it you dont HAVE too but when you are able to i really reccomend doing so.How long before a worn motor mount would HAVE to be replaced?
i would replace soon a worn moter mount can cause several other problems i would just replace what u have 2 if you are tight for money iff not replace all