ok i keep throwing a code i keep throwing p0841 and it acts like it only wants to run in 3rd gear says low/reverse sensor and same code with transmission oil pressure sensor. i have replaced the pcm with new and up to date flash. where is this sensor i and a mechanic but if its in the tranny i dont mess with it. is this located on the outside or in the pan. it has seemed to be doing this since i changed the filters and fluid my fluid level is full. is there a friction modifier i should put in the trans is lucas good for the trans? all help is greatly appreciated.

 

If the trans is in limp mode (wont shift/ wont go fast) then it does that to try to protect itself and prevent further damage. The oil temp sensor is inside the trans itself.