Shifting from Drive issue
hello all, new here.
i've been having some issues with my car lately so heres the story
When i start the car and proceed to put it in reverse the cars rpms race before it hits into gear, and it does this in drive also. BUT not all the time, so one day i drove around did it for a while then it threw a code, got it checked it was a 502 code ( vehicle speed sensor ) so i finally changed it out, the old one looks crappy so figured this may do it, drove it around didnt do it then it did it again, got the code cleared figured maybe the car needs to relearn it, didnt help. so i checked the fluid im pretty sure it needs to be changed because its a brownish color, so i added fluid ( was low ) and put some non slip in it thinking it could be internally... but if it was internals of the trans wouldnt it do this all the time? it seems to do better when the car is warmer. when i drive everything else is fine, only when i come to a stop does it do it going to drive, and when i drive there is no slipping im at a loss right now bc my girl has it in Connecticut and im on long island... so i cant help her
any help would be great guys. thanks