Remanufactured 4l80e transmission on a K3500 price

What is your question?

I want to fix this before it is an issue. 163.000 miles and has dark transmission fluid and was told it was used to haul a 5th wheel camper. I am going to use it to Plow snow so i want to fix it now before i am stuck in a snow bank next Winter. Unit has not been a plow truck yet!