You know when french onion dip has gone bad because it has water on the top.
You want to make sure that the transmission isn't making any suspicious noises. That could be a sign either your transmission or transmission fluid has gone bad. Also, the transmission fluid should not be an odd color: it should be the color it was when it was replaced.
when it does not work
It is important to know the symptoms of a bad car part. The symptoms of a bad motor or transmission mounts are loss the car part, shaking and lots of noise.
you know when you are not cotrolling the car.
If you eat it and then throw up. ;)
check it
If it is stale and a very light brown and nothing grows on top of it, then you know you have bad soil.
This sounds like an engine or transmission mount has gone bad and needs replaced.
It will probably smell bad or have a noticeably weird flavour to it.
It as a dark color and it emits a bad order that is easily recognizable
Swap it with one you know is good.