After pulling my trailer 10000# this weekend, my OD is missing when hot.
I pulled my trailer up hill for about 5 miles kept it out of OD.
When I starting going down hill I wanted to shift to OD but the light on the OD switch was gone and it would not shift to OD.
I got home let the truck sit over night and next morning I went to check it everything was normal.
Now when it is cold it work just fine after it heat up about 10 miles it stop working again and wont shift to OD any advice before I take it to the transmission shop.
The transmission light never has came on.

It is a 95 Auto

 

Someone before I take it to the transmission shop tomorrow.

 

If the fluid gets too hot, it won't go into OD.
What does the fluid look like/smell like?

 

The oil look good I just had it changed today just to make sourer.
It had 2 codes in it and they told me they could not fix it to take to someone else. So now it is sitting waiting for them to look at it they wont be able to do that before next week
The code 43 and 55 I think something like pcm fault and tcm comm fault.
I don’t know just have to wait I guess

 

They told me today that it could be the trans temp switch.
Someone had to have same problem let me know thanks